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Tüm alıştırma soruları

1987 soru

Tüm türler1,987Çoktan seçmeli1,020Çoklu seçim452Sayısal18Eşleştirme229Sıralama203Boşluk doldurma22Kısa cevap43
Soru 921Soru →

Place the operational and negotiation events in the exact chronological sequence required for two Cisco Catalyst switches to establish a functional IEEE 802.1Q trunk link using Dynamic Trunking Protocol (DTP) following CLI configuration.

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Cevap

The correct sequence begins with the CLI mode configuration on both switches, followed by Switch-A actively sending DTP request frames, Switch-B processing and agreeing to the trunking request, the operational transition of both interfaces to an active 802.1Q trunk, and finally the active forwarding and 4-byte tagging of frame traffic.
The correct order follows the standard Cisco IOS control and data plane progression: Configuration commands activate DTP on the interface -> The dynamic desirable interface actively sends DTP negotiation frames -> The dynamic auto interface receives the frame and agrees to form a trunk -> Both ports transition operationally to trunking status -> IEEE 802.1Q 4-byte frame tagging is applied to active traffic.

Adım Adım Çözüm

1
Identify administrative configuration stage
Switch-A is set to dynamic desirable and Switch-B is set to dynamic auto.
Administrative commands must be applied to the interfaces before any control-plane negotiation protocols can generate messages.
2
Determine active protocol packet generation
Switch-A sends DTP frames actively across the link.
Dynamic desirable ports actively initiate negotiation by sending DTP frames, whereas dynamic auto ports only listen until prompted.
3
Analyze protocol response and parameter matching
Switch-B receives the DTP request and responds affirmatively.
Dynamic auto mode transitions to a trunk state upon receiving an active negotiation request from a desirable or trunking neighbor.
4
Establish operational port state
Both ports transition to operational status trunking with 802.1Q encapsulation.
Once parameters are agreed upon, hardware state registers update the port state from access to trunking.
5
Apply data-plane framing rules
Ethernet frames traversing the link receive a 4-byte 802.1Q VLAN header, except for frames belonging to the native VLAN.
Data forwarding and 802.1Q frame encapsulation occur only after trunk negotiation and port state activation are fully finalized.

Anahtar Kavram

802.1Q Trunking & DTP Negotiation Sequence
Soru 922Soru →

A network engineer is analyzing performance degradation for an application that streams telemetry data across an enterprise network. The developer considers modifying the application to add custom sequencing and selective retransmission logic over UDP rather than switching to TCP. Which structural characteristic of the UDP header explains why native sequence tracking and acknowledgment cannot occur at the transport layer when using standard UDP?

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Cevap: The UDP header has a fixed 8-byte length containing only Source Port, Destination Port, Length, and Checksum fields, omitting sequence and acknowledgment fields entirely.

Cevap

The UDP header has a fixed 8-byte length containing only Source Port, Destination Port, Length, and Checksum fields, omitting sequence and acknowledgment fields entirely.
UDP features a minimal, fixed 8-byte header comprising four 16-bit fields: Source Port, Destination Port, Length, and Checksum. Because UDP lacks fields for Sequence Numbers, Acknowledgment Numbers, and Window Size (which are present in the 20-byte minimum TCP header), native transport-layer sequencing, flow control, and retransmission mechanisms are impossible without upper-layer application logic.

Adım Adım Çözüm

1
Examine the structural composition of the UDP header.
Identify that UDP consists of four 16-bit (2-byte) fields totaling 8 bytes: Source Port, Destination Port, Length, and Checksum.
Understanding the fixed 8-byte UDP header format clarifies which functions the protocol can and cannot natively support.
2
Compare UDP header capabilities against TCP reliability mechanisms.
Note that TCP includes explicit 32-bit Sequence Number and 32-bit Acknowledgment Number fields in its 20-byte baseline header, whereas UDP lacks these fields.
Sequence tracking, reorder detection, and flow control require dedicated protocol header fields that exist in TCP but are absent in UDP.
3
Deduce why sequence tracking must be implemented at the application layer when using UDP.
Because UDP operates statelessly without built-in sequence or ACK fields, any reliability or sequencing features must be handled above Layer 4 inside the application payload.
Confirms why the application must provide custom sequence numbers if it uses UDP for transport.

Anahtar Kavram

TCP vs UDP Header Overhead and Protocol Mechanics
Tahmini Süre:1m 30s
Soru 923Soru →

A network administrator is designing a virtualized data center environment to host high-performance enterprise applications. The implementation requires an architecture where the virtualization software interacts directly with the server physical hardware, avoiding the latency and overhead of a host operating system. Which component fulfills this requirement?

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Cevap: A Type 1 hypervisor installed directly on bare-metal hardware

Cevap

A Type 1 hypervisor installed directly on bare-metal hardware
The correct answer identifies the Type 1 hypervisor (bare-metal), which installs directly on the host server hardware. This architecture allows direct control of CPU, memory, and storage resources without passing requests through a primary operating system layer.

Adım Adım Çözüm

1
Analyze the operational requirements specified in the scenario
The requirement calls for a virtualization management layer running directly on physical hardware without an intermediate host OS footprint.
Eliminating the host operating system reduces hardware resource overhead, latency, and security attack vectors.
2
Compare hypervisor architectural types against the requirement
Type 1 hypervisors execute directly on physical server hardware (bare-metal), whereas Type 2 hypervisors execute as applications on top of a general-purpose host OS.
Direct hardware interaction defines the bare-metal nature of Type 1 hypervisors.
3
Select the component matching the bare-metal architecture role
The Type 1 hypervisor is the correct component.
It directly satisfies the requirement for bare-metal performance and virtualization management.

Anahtar Kavram

Type 1 vs. Type 2 Hypervisors in Network and Server Virtualization
Soru 924Soru →

An administrator is reviewing IPv6 address scopes and interface identifier generation rules. Which of the following statements correctly describe standard IPv6 address prefixes and EUI-64 requirements? (Select TWO.)

Geçerli olan tümünü seçin

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Cevap: The IPv6 prefix fe80::/10 is designated for link-local unicast addressing on a local segment.; The IPv6 prefix ff00::/8 is reserved for multicast addresses.

Cevap

The statement identifying fe80::/10 as link-local unicast addressing and the statement identifying ff00::/8 as multicast addressing are both correct.
The prefix fe80::/10 is defined in RFC 4291 for link-local unicast addressing, while ff00::/8 is reserved for IPv6 multicast traffic.

Adım Adım Çözüm

1
Evaluate the reserved IPv6 scope prefixes.
fe80::/10 is confirmed as Link-Local and ff00::/8 is confirmed as Multicast.
Standard IPv6 RFC specifications assign fe80::/10 to link-local unicast communication and ff00::/8 to multicast.
2
Evaluate EUI-64 identifier construction.
The statement claiming FFFF insertion without bit flipping is false.
EUI-64 requires inserting FFFE into the MAC address midpoint and inverting the 7th bit (U/L bit).
3
Evaluate IPv6 broadcast and subnet host calculations.
The statement claiming two host addresses are subtracted for network and broadcast IDs is false.
IPv6 eliminates traditional subnet broadcast addresses in favor of multicast.

Anahtar Kavram

IPv6 Address Scopes and EUI-64 Identifier Rules
Soru 925Soru →

A network architect is designing a high-availability infrastructure for an enterprise campus network. The design replaces legacy distribution switches with Layer 3 switches and deploys a bare-metal Type 1 hypervisor host to support core virtualized services such as DNS, DHCP, and IPAM. Which of the following statements correctly describe the operational roles and traffic handling behavior of these components? (Select TWO.)

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Cevap: The Layer 3 switch terminates VLAN broadcast domains at the distribution layer by performing IP routing between IP subnets.; The Type 1 hypervisor runs directly on the bare-metal host hardware to allocate hardware resources to virtualized infrastructure services without a host operating system layer.

Cevap

The correct statements are that the Layer 3 switch terminates VLAN broadcast domains at the distribution layer by routing between IP subnets, and the Type 1 hypervisor runs directly on bare-metal hardware without a host operating system.
Layer 3 switches establish Layer 3 boundaries between subnets, terminating broadcast domains for each VLAN while routing traffic between them. Type 1 hypervisors run directly on the physical hardware (bare metal), providing high performance and direct resource management for server virtual machines.

Adım Adım Çözüm

1
Analyze Layer 3 switch operational roles.
Layer 3 switches isolate broadcast domains per VLAN and perform inter-VLAN routing at Layer 3.
Layer 2 switches isolate collision domains but forward broadcast frames within a VLAN. Adding Layer 3 capabilities creates distinct broadcast domain boundaries per subnet.
2
Evaluate hypervisor architecture types.
Type 1 hypervisors operate directly on physical bare metal, while Type 2 hypervisors run inside a conventional host operating system.
Bare-metal deployment minimizes latency and resource overhead for enterprise virtualized network services.

Anahtar Kavram

Layer 3 Switch and Hypervisor Component Roles
Tahmini Süre:2m 0s
Soru 926Soru →

A network administrator is evaluating virtualization technologies for a new enterprise data center deployment. Which two statements correctly describe the characteristics of a Type 1 hypervisor? (Select two.)

Geçerli olan tümünü seçin

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Cevap: It installs directly on physical server hardware without requiring an underlying host operating system.; It delivers lower latency and higher throughput performance compared to hosted hypervisors.

Cevap

Type 1 hypervisors install directly on bare-metal server hardware without a host operating system and provide lower latency and superior performance for virtual machines.
Type 1 hypervisors install directly on physical hardware (bare-metal) without requiring a pre-existing host operating system. Because they bypass intermediate host OS software layers, they offer lower latency and higher performance, making them ideal for enterprise virtualized environments.

Adım Adım Çözüm

1
Analyze hypervisor architectural placement.
Recognize that Type 1 hypervisors reside directly on server hardware (bare-metal) rather than running on top of an existing operating system.
Architectural placement distinguishes bare-metal Type 1 hypervisors from hosted Type 2 hypervisors.
2
Evaluate operational efficiency and latency characteristics.
Determine that eliminating host operating system abstraction layers minimizes latency and maximizes processing throughput.
Direct hardware control streamlines CPU scheduling and memory management for virtualized enterprise workloads.

Anahtar Kavram

Type 1 Bare-Metal Hypervisor Architecture
Soru 927Soru →

A network administrator is inspecting a Cisco IOS switch interface connected to a server. The output of the `show interfaces GigabitEthernet 0/1` command reveals a high number of Frame Check Sequence (FCS) errors and late collisions. Which two physical or data-link layer issues are the most likely causes of these specific interface counter statistics? (Select two.)

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Cevap: Physical cable damage, excessive electromagnetic interference, or faulty connectors corrupting bits in transit.; A duplex mismatch between the switch port and the connected device, causing the half-duplex side to transmit while receiving data after the slot time.

Cevap

Physical cable damage or interference causing bit corruption (FCS errors) and a duplex mismatch causing collision detection after the 64-byte window (late collisions).
Physical cable damage or electrical interference causes bits to flip in transit, resulting in Frame Check Sequence (FCS) checksum mismatches. A duplex mismatch causes the half-duplex end to attempt transmission while the full-duplex end sends traffic, producing late collisions after the initial 64-byte collision window.

Adım Adım Çözüm

1
Analyze the FCS error counter symptom
Identify physical layer causes such as bad cabling, interference, or faulty interface hardware
FCS errors indicate that frames arrived corrupted at the receiving interface.
2
Analyze the late collision counter symptom
Identify duplex misconfigurations or excessive cable lengths
Late collisions occur when a collision is detected after the 512-bit (64-byte) slot time, characteristic of half-duplex operating while the peer transmits full-duplex.

Anahtar Kavram

Interface counter troubleshooting for FCS errors and late collisions
Soru 928Soru →

A network technician is simplifying an IPv6 address for documentation purposes by compressing leading zeros and contiguous fields of zeros. Which format represents the correctly compressed version of 2001:0db8:0000:0000:0000:0000:0000:0001?

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Cevap: 2001:db8::1

Cevap

The correctly compressed IPv6 address is 2001:db8::1.
The address 2001:db8::1 strictly follows RFC IPv6 address compression rules by omitting the leading zero in '0db8' to become 'db8' and replacing all consecutive fields of zeros (:0000:0000:0000:0000:0000:) with a single double colon (::).

Adım Adım Çözüm

1
Omit leading zeros in each 16-bit hexadecimal field (hextet).
The second hextet 0db8 becomes db8, and 0001 becomes 1.
Leading zeros are redundant and should be removed per standard RFC 4291 / RFC 5952 formatting guidelines.
2
Replace the single contiguous run of consecutive all-zero hextets with a double colon (::).
The five zero hextets (:0000:0000:0000:0000:0000:) are replaced by a single double colon (::).
The double colon represents one or more contiguous fields of zeros to shorten the address.
3
Combine the resulting hextets into the final simplified address.
The address compresses to 2001:db8::1.
This yields a valid, unambiguous 128-bit IPv6 address format.

Anahtar Kavram

IPv6 Address Compression Rules (RFC 4291 and RFC 5952)
Soru 929Soru →

An enterprise network administrator is deploying a virtualized server environment using a Type 1 hypervisor to host multiple virtual machines across separate VLANs. Which two statements accurately describe the operational mechanics of the virtual switch (vSwitch) and hypervisor architecture in this scenario? (Select two.)

Geçerli olan tümünü seçin

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Cevap: Intra-host traffic between virtual machines on the same VLAN is switched internally by the vSwitch without egressing through physical network interface cards.; The vSwitch can perform IEEE 802.1Q VLAN tagging on virtual machine frames before sending them across physical uplinks to trunk ports on the physical switch.

Cevap

Intra-host traffic between virtual machines on the same VLAN is switched internally by the vSwitch without egressing through physical network interface cards, AND the vSwitch can perform IEEE 802.1Q VLAN tagging on virtual machine frames before sending them across physical uplinks to trunk ports on the physical switch.
In Type 1 hypervisor architectures, intra-host traffic between co-located virtual machines on the same virtual switch stays within host software memory without exiting to the physical network interface cards. Additionally, virtual switches can tag frames with IEEE 802.1Q VLAN headers before sending them over physical uplink interfaces connected to physical switch trunk ports.

Adım Adım Çözüm

1
Analyze the architecture of a Type 1 hypervisor and vSwitch frame forwarding.
A Type 1 hypervisor operates directly on bare-metal hardware. The vSwitch handles Layer 2 frame forwarding within the hypervisor software kernel.
Understanding bare-metal execution clarifies that there is no general-purpose host OS beneath the hypervisor to handle network I/O.
2
Evaluate intra-host virtual machine traffic paths.
Frames sent between VMs connected to the same vSwitch and VLAN are switched directly within server memory.
Frames only hit physical network interface card (pNIC) uplinks when destined for external network devices.
3
Determine VLAN tagging capabilities and loop prevention mechanics.
vSwitches encapsulate frames with 802.1Q tags for trunk traffic and rely on non-STP forwarding rules (such as prohibiting forwarding between physical uplinks) to avoid loops.
Standard vSwitches do not process or generate Spanning Tree Protocol BPDUs.

Anahtar Kavram

Type 1 Hypervisor and Virtual Switch (vSwitch) Frame Forwarding Mechanics
Tahmini Süre:2m 0s
Soru 930Soru →

A network technician observes an automatically configured Link-Local IPv6 address of FE80::0250:56FF:FE9A:BCDE on a server's network interface using SLAAC and EUI-64. Based on standard EUI-64 interface identifier rules, which two statements regarding this interface's physical MAC address and link-local generation process are correct? (Select two.)

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Cevap: The original burned-in MAC address of the interface is 00:50:56:9A:BC:DE.; The 7th bit (Universal/Local bit) of the MAC address's first byte was inverted from 0 to 1 during EUI-64 processing to indicate a modified interface ID.

Cevap

The original burned-in MAC address of the interface is 00:50:56:9A:BC:DE, and the 7th bit (Universal/Local bit) of the MAC address's first byte was inverted from 0 to 1 during EUI-64 processing.
The link-local IPv6 address FE80::0250:56FF:FE9A:BCDE uses an EUI-64 interface identifier created from a 48-bit MAC address. EUI-64 inserts the hexadecimal value FFFE into the middle of the MAC address (between the 3rd and 4th bytes) and flips the 7th bit of the first byte (the Universal/Local bit). Reversing this process on 0250:56FF:FE9A:BCDE requires removing FFFE to leave 02:50:56:9A:BC:DE, and flipping the 7th bit of the first byte 02 (0000 0010 in binary) back to 0, which gives 00 (0000 0000 in binary). Thus, the original MAC address is 00:50:56:9A:BC:DE, and the 7th bit was inverted from 0 to 1 during the process.

Adım Adım Çözüm

1
Analyze the 64-bit interface identifier portion of the IPv6 address.
Interface ID is 0250:56FF:FE9A:BCDE.
The link-local prefix is FE80::/64, leaving the last 64 bits as the EUI-64 identifier.
2
Identify and remove the inserted midpoint 16-bit hex sequence.
Removing FFFE from 0250:56FF:FE9A:BCDE yields the 48-bit sequence 02:50:56:9A:BC:DE.
EUI-64 generation inserts FFFE between the 24-bit OUI and the 24-bit device identifier.
3
Invert the 7th bit (Universal/Local bit) of the first byte.
First byte 02 (binary 0000 0010) inverted at the 7th bit becomes 00 (binary 0000 0000). The resulting original MAC address is 00:50:56:9A:BC:DE.
IEEE EUI-64 rule requires flipping the 7th bit (0 for universal scope becomes 1 for local interface ID uniqueness).

Anahtar Kavram

EUI-64 Interface Identifier Derivation
Soru 931Soru →

An administrator issues the `show interfaces trunk` command on Switch-A while troubleshooting inter-switch connectivity to Switch-B. The command output confirms that interface GigabitEthernet1/0/1 is actively trunking using 802.1Q encapsulation. However, syslog messages periodically display `%CDP-4-NATIVE_VLAN_MISMATCH` notifications because Switch-A is configured with native VLAN 30 while Switch-B uses native VLAN 1. Which two statements accurately describe how frames are handled across this link? (Select two.)

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Cevap: Frames generated by hosts in VLAN 30 on Switch-A are transmitted across the trunk link without an 802.1Q header tag.; Untagged frames arriving at Switch-B from Switch-A will be placed into VLAN 1, resulting in cross-VLAN traffic leakage.

Cevap

Frames originating from VLAN 30 on Switch-A are transmitted without an 802.1Q tag, and Switch-B associates incoming untagged frames with its own native VLAN (VLAN 1).
Under IEEE 802.1Q specifications, traffic matching the native VLAN of the transmitting switch interface is sent without an 802.1Q header. Because Switch-A has a native VLAN of 30, it sends VLAN 30 frames untagged. Upon receiving untagged frames, Switch-B associates them with its own native VLAN (VLAN 1). This results in unexpected cross-VLAN communication between VLAN 30 on Switch-A and VLAN 1 on Switch-B.

Adım Adım Çözüm

1
Identify the egress frame tagging behavior on Switch-A.
Because VLAN 30 is designated as the native VLAN on Switch-A, frames belonging to VLAN 30 are forwarded across the trunk without an 802.1Q tag.
Under 802.1Q trunking rules, frames matching the local native VLAN of the transmitting port are sent untagged.
2
Identify the ingress frame processing behavior on Switch-B.
Switch-B receives the untagged frame and assigns it to its configured native VLAN, which is VLAN 1.
Receiving switches process all incoming untagged Ethernet frames within whatever VLAN is locally configured as native on that receiving trunk port.

Anahtar Kavram

802.1Q Native VLAN Tagging Mechanics and Mismatch Behavior
Soru 932Soru →

A network engineer is inspecting packet capture data from a host running a dual-protocol network diagnostic service. The service transmits real-time telemetry using a connectionless transport protocol while concurrently maintaining a stateful management session using a connection-oriented transport protocol. When evaluating the transport layer encapsulation of these two flows, which structural characteristic correctly distinguishes the connectionless transport header from the connection-oriented transport header?

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Cevap: The connectionless header maintains a fixed 8-byte structure consisting strictly of Source Port, Destination Port, Length, and Checksum fields.

Cevap

The connectionless transport header (UDP) maintains a minimalist, fixed 8-byte header structure containing only Source Port, Destination Port, Length, and Checksum fields, whereas connection-oriented TCP headers require at least 20 bytes to accommodate sequencing, acknowledgments, window size, and control flags.
The correct answer accurately describes the standard UDP header structure. UDP operates as a lightweight, connectionless protocol with a fixed 8-byte header overhead. It comprises exactly four fields, each 16 bits (2 bytes) in length: Source Port, Destination Port, Length, and Checksum. This minimal structure allows for rapid transmission with minimal latency and process overhead.

Adım Adım Çözüm

1
Identify the protocols representing connectionless and connection-oriented transport layer communications.
UDP represents connectionless communications, and TCP represents connection-oriented communications.
Transport layer protocol comparison requires mapping UDP to connectionless datagram delivery and TCP to stateful stream delivery.
2
Analyze the header structure of the UDP (connectionless) transport protocol.
UDP headers contain four 16-bit (2-byte) fields totaling 8 bytes: Source Port (16 bits), Destination Port (16 bits), Length (16 bits), and Checksum (16 bits).
UDP is designed for low overhead without connection setup, state tracking, sequence numbers, or windowing fields.
3
Compare UDP header characteristics with TCP header characteristics to evaluate distractor validity.
TCP headers are 20 bytes minimum (up to 60 bytes with options) and contain Sequence Numbers, Acknowledgment Numbers, Data Offset, Reserved bits, Control Flags, Window Size, Checksum, and Urgent Pointer.
Distractors incorrectly attribute TCP features, IP-layer offloading, or variable header truncation to UDP.

Anahtar Kavram

Transport Layer TCP vs UDP Header Structure and Protocol Overhead
Soru 933Soru →

A network engineer installs VMware Workstation on a laptop running Windows 11 to set up a test environment with multiple guest operating systems. Which architecture describes this virtualization deployment?

Cevabı ve açıklamayı göster

Cevap: A Type 2 hypervisor running on top of an existing host operating system

Cevap

A Type 2 hypervisor running on top of an existing host operating system
VMware Workstation installed on a Windows 11 laptop is a standard example of a Type 2 hypervisor. Type 2 (hosted) hypervisors run as application software on top of a host operating system, which handles memory, CPU, and device management.

Adım Adım Çözüm

1
Analyze the installation context described in the scenario
The hypervisor (VMware Workstation) is being installed inside a pre-existing desktop operating system (Windows 11).
Understanding where the hypervisor executes relative to the physical hardware determines its virtualization class.
2
Classify the hypervisor type based on hardware interaction
Hypervisors that run on top of a host operating system are categorized as Type 2 (hosted) hypervisors.
Type 2 hypervisors rely on the host OS to manage hardware interactions and system devices.

Anahtar Kavram

Type 2 (Hosted) Hypervisor Architecture
Soru 934Soru →

A network administrator is evaluating the core infrastructure components for a new branch office deployment, including a router, an unsegmented Layer 2 switch, a Next-Generation Firewall (NGFW), and virtualization servers. Which two statements accurately describe the operational roles and domain boundaries of these network components?

Geçerli olan tümünü seçin

Cevabı ve açıklamayı göster

Cevap: A router isolates broadcast domains at each configured Layer 3 interface.; A Next-Generation Firewall performs stateful inspection and application-level control up through Layer 7 of the OSI model.

Cevap

A router isolates broadcast domains at each configured Layer 3 interface, and a Next-Generation Firewall performs stateful inspection and application-level control up through Layer 7.
Routers operate at Layer 3 and prevent Layer 2 broadcast traffic from propagating across interfaces, creating distinct broadcast domains. Next-Generation Firewalls expand upon traditional packet filtering by integrating deep packet inspection and application awareness up through Layer 7 of the OSI model.

Adım Adım Çözüm

1
Analyze the forwarding domain boundaries of routers versus Layer 2 switches.
Routers operate at Layer 3 and stop Layer 2 broadcasts from passing between interfaces. Layer 2 switches split collision domains per port but maintain a single shared broadcast domain by default.
Understanding domain separation is fundamental to network architecture.
2
Evaluate the functional scope of Next-Generation Firewalls (NGFW).
NGFWs inspect traffic up to Layer 7 (Application layer) to provide deep packet inspection and threat prevention.
Standard firewalls filter traffic up to Layer 4, while NGFWs inspect application payloads.
3
Differentiate hypervisor architecture classifications.
Type 1 hypervisors run directly on bare metal, while Type 2 hypervisors rely on a host operating system.
Proper classification prevents misidentifying virtualization platform architecture.

Anahtar Kavram

Network Component Operational Roles and Domain Boundaries
Tahmini Süre:1m 30s
Soru 935Soru →

A Cisco Catalyst switch receives an ingress Ethernet frame tagged for VLAN 10 on port GigabitEthernet0/1. The frame contains a source MAC address of 0010.AB12.3456 and a destination MAC address of 0020.CD34.5678. Prior to receiving this frame, the switch MAC address table contains a dynamic entry listing 0010.AB12.3456 on port GigabitEthernet0/2 in VLAN 10, and a static entry listing 0020.CD34.5678 on port GigabitEthernet0/3 in VLAN 10. Port GigabitEthernet0/4 is an active access port configured in VLAN 20, while port GigabitEthernet0/5 is an active 802.1Q trunk port allowing VLANs 10 and 20. Which two actions does the switch perform upon processing this frame?

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Cevabı ve açıklamayı göster

Cevap: It updates the MAC address table entry for 0010.AB12.3456 to associate it with port GigabitEthernet0/1 in VLAN 10.; It forwards the frame exclusively out port GigabitEthernet0/3.

Cevap

The switch updates its MAC address table entry for source MAC 0010.AB12.3456 to port GigabitEthernet0/1 in VLAN 10, and forwards the frame directly out port GigabitEthernet0/3.
When an Ethernet switch receives a frame, it performs learning and forwarding independently. First, it reads the source MAC address 0010.AB12.3456 and updates the MAC address table entry to map to port GigabitEthernet0/1 in VLAN 10. Second, it looks up the destination MAC address 0020.CD34.5678 in the MAC table for VLAN 10. Because a matching entry exists for GigabitEthernet0/3, the switch forwards the frame directly out GigabitEthernet0/3 without flooding.

Adım Adım Çözüm

1
Analyze ingress port processing and source MAC learning logic.
The source MAC address 0010.AB12.3456 arrived on GigabitEthernet0/1 in VLAN 10. The switch updates the existing table mapping for 0010.AB12.3456 from GigabitEthernet0/2 to GigabitEthernet0/1.
Layer 2 switches evaluate every incoming frame's source MAC address to build and maintain up-to-date MAC table port mappings.
2
Analyze egress port forwarding logic based on destination MAC lookup.
The destination MAC 0020.CD34.5678 is matched in the MAC table for VLAN 10 pointing to GigabitEthernet0/3.
When a match is found in the MAC table for the frame's destination address in the matching VLAN, known unicast forwarding directs the frame solely to that designated egress interface.

Anahtar Kavram

Layer 2 MAC address table dynamic learning, station movement handling, and known unicast forwarding logic.
Soru 936Soru →

A network administrator needs to create a new VLAN named 'VOICE' with ID 20 on a fresh Cisco Catalyst switch and manually assign interface FastEthernet 0/1 as an active access port belonging to this VLAN. Place the Cisco IOS CLI commands in the exact correct sequence required to perform this complete configuration from privileged EXEC mode.

Öğeleri doğru sıraya koymak için sürükleyin

Cevabı ve açıklamayı göster

Cevap

The correct operational order begins by entering global configuration mode (configure terminal), creating the VLAN (vlan 20), naming the VLAN (name VOICE), entering interface mode (interface fastethernet 0/1), explicitly setting the link to access mode (switchport mode access), and finally binding the port to the VLAN (switchport access vlan 20).
Cisco IOS configuration follows a strict modal hierarchy. The administrator must first enter global configuration mode (`configure terminal`), instantiate VLAN 20 (`vlan 20`), name it while in `config-vlan` sub-mode (`name VOICE`), navigate to the desired interface (`interface fastethernet 0/1`), set the operational mode (`switchport mode access`), and assign the access VLAN (`switchport access vlan 20`).

Adım Adım Çözüm

1
Enter Global Configuration mode
Switch prompt changes to Switch(config)#
CLI context must be in global configuration mode to create network-wide objects such as VLANs or navigate to specific interfaces.
2
Create VLAN 20
Switch prompt changes to Switch(config-vlan)#
Executing 'vlan 20' creates the L2 broadcast domain in the VLAN database and shifts context to VLAN configuration mode.
3
Assign the VLAN Name
VLAN 20 is named 'VOICE'
Sub-commands like 'name' must be issued while in Config-VLAN mode directly following VLAN creation.
4
Navigate to target switchport interface
Switch prompt changes to Switch(config-if)#
Interface commands require entering interface configuration mode for FastEthernet 0/1.
5
Set port operational mode to access
DTP dynamic negotiation is disabled or overridden to static access mode
Best security and operational practice requires explicitly defining 'switchport mode access' before or alongside VLAN assignment.
6
Assign interface to VLAN 20
Interface FastEthernet 0/1 actively forwards untagged traffic for VLAN 20
Executing 'switchport access vlan 20' under interface configuration mode completes the access port assignment.

Anahtar Kavram

Cisco IOS CLI Configuration Hierarchy for VLAN Creation and Access Port Binding
Soru 937Soru →

A network engineer is configuring Variable Length Subnet Masking (VLSM) on a router interface for two internal enterprise subnets using the base block 172.16.10.0/24172.16.10.0/24. Subnet A must support at least 60 usable hosts, while Subnet B must support at least 28 usable hosts. Subnet A is allocated first starting at 172.16.10.0172.16.10.0 using the smallest prefix length that satisfies its requirement. Subnet B is allocated immediately following Subnet A using its smallest required prefix length. Which two statements regarding this subnetting layout are correct? (Select two.)

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Cevap: The broadcast address for Subnet A is 172.16.10.63172.16.10.63.; The IP address 172.16.10.94172.16.10.94 is a valid, usable host address in Subnet B.

Cevap

The broadcast address for Subnet A is 172.16.10.63172.16.10.63, and the IP address 172.16.10.94172.16.10.94 is a valid, usable host address in Subnet B.
For Subnet A, 60 hosts require 6 host bits (26−2=622^6 - 2 = 62 usable), yielding a /26/26 mask. Starting at 172.16.10.0/26172.16.10.0/26, the block ends at broadcast address 172.16.10.63172.16.10.63. Subnet B starts at the next available address, 172.16.10.64172.16.10.64, and requires 5 host bits (25−2=302^5 - 2 = 30 usable) for 28 hosts, giving a /27/27 mask (172.16.10.64/27172.16.10.64/27). The valid usable host range for Subnet B is 172.16.10.65172.16.10.65 through 172.16.10.94172.16.10.94, making 172.16.10.94172.16.10.94 a valid usable host address.

Adım Adım Çözüm

1
Calculate prefix length and host range for Subnet A.
Subnet A prefix is /26/26 (255.255.255.192255.255.255.192), spanning 172.16.10.0/26172.16.10.0/26. Network ID: 172.16.10.0172.16.10.0, Usable range: 172.16.10.1172.16.10.1–172.16.10.62172.16.10.62, Broadcast: 172.16.10.63172.16.10.63.
60 host requirement needs 2h−2≥60  ⟹  h=62^h - 2 \ge 60 \implies h=6 bits. 32−6=2632 - 6 = 26.
2
Determine the starting boundary and prefix length for Subnet B.
Subnet B starts at 172.16.10.64172.16.10.64 with prefix /27/27 (255.255.255.224255.255.255.224). Network ID: 172.16.10.64172.16.10.64, Usable range: 172.16.10.65172.16.10.65–172.16.10.94172.16.10.94, Broadcast: 172.16.10.95172.16.10.95.
Next contiguous subnet after 172.16.10.63172.16.10.63 is 172.16.10.64172.16.10.64. 28 host requirement needs 2h−2≥28  ⟹  h=52^h - 2 \ge 28 \implies h=5 bits. 32−5=2732 - 5 = 27.
3
Evaluate the choices against calculated subnet boundaries and RFC 1918 rules.
Identified 172.16.10.63172.16.10.63 as Subnet A's broadcast address and 172.16.10.94172.16.10.94 as Subnet B's last usable host IP.
Network addresses (172.16.10.64172.16.10.64) cannot be assigned to hosts, and 172.32.x.x172.32.x.x falls outside RFC 1918 private space.

Anahtar Kavram

VLSM Subnet Sizing and Boundary Calculation
Soru 938Soru →

A network engineer is troubleshooting trunk connectivity between two switches and executes the following command on Switch-A:

Switch-A# show interfaces gigabitEthernet 1/0/2 trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/2 auto n-802.1q trunking 99

Port VLANs allowed on trunk
Gi1/0/2 1-1005

Port VLANs allowed and active in management domain
Gi1/0/2 1,10,20,99

Port VLANs in spanning tree forwarding state and not pruned
Gi1/0/2 1,10,20

CDP emits periodic syslog messages warning of a native VLAN mismatch with the remote neighbor switch. Which statement accurately explains why VLAN 99 is absent from the spanning tree forwarding list and how untagged frames sent from Switch-A across this link are handled?

Cevabı ve açıklamayı göster

Cevap: Spanning Tree Protocol placed VLAN 99 into a PVID-inconsistency blocked state because the remote switch uses a different native VLAN, while Switch-A transmits VLAN 99 frames across the trunk without an 802.1Q tag.

Cevap

Spanning Tree Protocol placed VLAN 99 into a PVID-inconsistency blocked state because the remote switch uses a different native VLAN, while Switch-A transmits VLAN 99 frames across the trunk without an 802.1Q tag.
On an IEEE 802.1Q trunk, traffic belonging to the configured native VLAN is transmitted untagged. When connected switches have mismatched native VLAN configurations, Cisco Per-VLAN Spanning Tree (PVST+/Rapid PVST+) detects a Port VLAN ID (PVID) inconsistency through BPDUs. To prevent Layer 2 bridging loops and unauthorized traffic leaking between different VLANs, STP blocks the mismatched native VLAN on the trunk interface, omitting it from the 'VLANs in spanning tree forwarding state' list.

Adım Adım Çözüm

1
Analyze the 'show interfaces trunk' output fields.
Interface Gi1/0/2 has negotiated 802.1Q trunking (mode auto, status trunking) with Native VLAN 99. VLAN 99 is listed under allowed VLANs and active management domain VLANs.
Confirms that VLAN 99 exists in the local VLAN database and is permitted on the trunk allowed list.
2
Compare active management VLANs against spanning tree forwarding VLANs.
VLAN 99 is present in the active management domain (1, 10, 20, 99) but missing from the spanning tree forwarding state list (1, 10, 20).
Identifies that Spanning Tree Protocol (STP) has placed VLAN 99 into a blocked state.
3
Evaluate the impact of the CDP native VLAN mismatch warning on 802.1Q trunk operations.
When native VLANs differ across an 802.1Q trunk link, PVST+/Rapid PVST+ detects a PVID inconsistency via BPDUs and puts the native VLAN into a PVID-inconsistency blocking state. Per IEEE 802.1Q standards, frames originating from the local native VLAN (VLAN 99) are transmitted without an 802.1Q tag.
Connects the symptoms of the syslog warning to STP blocking mechanics and 802.1Q tagging behavior.

Anahtar Kavram

802.1Q Native VLAN Untagged Framing and STP PVID Inconsistency Blocking
Soru 939Soru →

An engineer is evaluating Layer 2 discovery protocol operations on a Cisco Catalyst switch connected to multi-vendor infrastructure. The switch is running the following active configuration:

text lldp run ! interface GigabitEthernet1/0/12 description Link to Non-Cisco Switch no cdp enable lldp transmit lldp receive ! interface GigabitEthernet1/0/24 description Link to VoIP Phone cdp enable no lldp transmit

During a network audit, the engineer issues the command `show lldp neighbors detail` and receives the following partial CLI output:

text ------------------------------------------------ Local Interface: Gi1/0/12 Chassis id: 0021.a012.3456 Port id: Eth1/1 Port Description: Ethernet1/1 System Name: SW-CORE-NEXUS System Description: Cisco Nexus Operating System (NX-OS) Software Time remaining: 105 seconds System Capabilities: Bridge, Router Enabled Capabilities: Bridge Management Addresses: IP: 10.1.100.2 Auto Negotiation: supported, enabled Physical media capabilities: 1000baseT(FD) Media Attachment Unit Type: 30 VLAN ID: 10

Which two conclusions accurately describe the protocol behavior and neighbor state for this switch based on the configuration and command output?

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Cevap: The local interface GigabitEthernet1/0/12 is successfully processing IEEE 802.1AB Type-Length-Value (TLV) data frames from the remote neighbor SW-CORE-NEXUS.; Interface GigabitEthernet1/0/24 will fail to transmit LLDP Data Units (LLDPDUs) to the connected VoIP phone, but it will continue sending CDP advertisements.

Cevap

The local interface GigabitEthernet1/0/12 is processing IEEE 802.1AB Type-Length-Value (TLV) frames, and interface GigabitEthernet1/0/24 will refrain from transmitting outbound LLDP frames while retaining active CDP transmission.
LLDP relies on IEEE 802.1AB standard TLVs to exchange information between multi-vendor devices, which is demonstrated by the detailed attributes shown for SW-CORE-NEXUS on GigabitEthernet1/0/12. Furthermore, interface GigabitEthernet1/0/24 explicitly disables LLDP transmissions via 'no lldp transmit' while keeping CDP active via 'cdp enable'.

Adım Adım Çözüm

1
Analyze interface GigabitEthernet1/0/12 configuration and protocol standard.
Interface Gi1/0/12 has CDP disabled and LLDP enabled ('lldp transmit' and 'lldp receive'). LLDP operates under IEEE 802.1AB using TLVs.
Verify standard protocol characteristics for LLDP neighbor discovery.
2
Evaluate interface GigabitEthernet1/0/24 interface commands.
'no lldp transmit' suppresses outgoing LLDP messages on Gi1/0/24, while 'cdp enable' maintains active CDP outbound frames.
Determine granular protocol control per interface.
3
Compare default CDP vs. LLDP holdtime timers against the CLI output.
CDP default holdtime is 180 seconds, while LLDP default holdtime is 120 seconds. Output shows 'Time remaining: 105 seconds', confirming a 120-second starting value for LLDP.
Differentiate default timer parameters between CDP and LLDP.

Anahtar Kavram

Layer 2 Discovery Protocol (CDP and LLDP) Operation, IEEE 802.1AB TLV Structure, and Per-Interface Control
Soru 940Soru →

A network engineer is configuring an internal WLAN management interface on an enterprise wireless LAN controller. To comply with corporate security policy, the interface must be assigned an IPv4 address from the RFC 1918 private address space so that it is non-routable over the public Internet. Which of the following IPv4 addresses meets this requirement?

Cevabı ve açıklamayı göster

Cevap: 172.22.100.15

Cevap

172.22.100.15 is the only address within the RFC 1918 private IPv4 specification.
The IPv4 address 172.22.100.15 belongs to the 172.16.0.0/12 block (range 172.16.0.0 – 172.31.255.255), which is explicitly reserved by RFC 1918 for private internal networking.

Adım Adım Çözüm

1
Recall the defined RFC 1918 private IPv4 address blocks.
Class A: 10.0.0.0 to 10.255.255.255 (10.0.0.0/8); Class B: 172.16.0.0 to 172.31.255.255 (172.16.0.0/12); Class C: 192.168.0.0 to 192.168.255.255 (192.168.0.0/16).
RFC 1918 sets aside specific address ranges for internal private enterprise networks.
2
Compare each option against the RFC 1918 range limits.
172.22.100.15 has a second octet of 22, which is between 16 and 31.
Any address in the 172.16.0.0/12 block is a valid private IPv4 address.

Anahtar Kavram

RFC 1918 Private IPv4 Address Ranges
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