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Tüm alıştırma soruları

1987 soru

Tüm türler1,987Çoktan seçmeli1,020Çoklu seçim452Sayısal18Eşleştirme229Sıralama203Boşluk doldurma22Kısa cevap43
Soru 1061Soru →

A network technician is configuring a new subnet with an IPv4 prefix length of /28/28. How many usable host IPv4 addresses are available on this subnet?

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Cevap: 14

Cevap

14 usable IPv4 host addresses are available on a /28 subnet.
For a /28/28 prefix, the host portion contains 32−28=432 - 28 = 4 bits. The formula to calculate usable hosts is 2h−22^h - 2, where hh is the number of host bits. Therefore, 24−2=16−2=142^4 - 2 = 16 - 2 = 14 usable host IPv4 addresses.

Adım Adım Çözüm

1
Determine the number of host bits available.
Host bits = 32−28=432 - 28 = 4 bits.
An IPv4 address consists of 32 bits. Subtracting the prefix length (/28) leaves the host portion of the address.
2
Calculate total IP address space for the subnet.
Total addresses = 24=162^4 = 16 addresses.
The formula 2h2^h determines total IP address combinations, where hh is the number of host bits.
3
Subtract reserved addresses to get usable host addresses.
Usable addresses = 16−2=1416 - 2 = 14 addresses.
The first address (subnet ID) and last address (broadcast) cannot be assigned to individual hosts.

Anahtar Kavram

IPv4 Subnet Usable Host Calculation
Soru 1062Soru →

A network administrator is establishing a dynamic IEEE 802.3ad Link Aggregation Control Protocol (LACP) Layer 2 EtherChannel bundle between two Cisco Catalyst switches. Physical member interfaces GigabitEthernet1/0/1 and GigabitEthernet1/0/2 are being assigned to channel-group 5. Which two configuration conditions or operational requirements must be satisfied on the local and remote switches for the EtherChannel to successfully negotiate and operationalize both member links? (Select two.)

Geçerli olan tümünü seçin

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Cevap: All physical member interfaces within the channel group on a switch must match in speed, duplex mode, and trunking configuration (VLAN membership and native VLAN).; At least one side of the link must be set to LACP active mode, while the opposing side is configured in either active or passive mode.

Cevap

The two correct requirements are: 1) Physical member interfaces on a switch must match in speed, duplex, and trunking parameters, and 2) At least one side of the link must be configured in active LACP mode while the opposing side is set to active or passive mode.
The options specifying interface parameter consistency (speed, duplex, trunking settings) and LACP active/passive mode matching are correct. LACP requires physical port settings to be identical across members on the same switch, and at least one connected switch interface must be set to LACP active mode to initiate the 802.3ad negotiation sequence.

Adım Adım Çözüm

1
Analyze LACP negotiation protocol requirements
LACP (802.3ad) uses active and passive negotiation modes. Active ports send LACP packets to initiate negotiation, while passive ports only respond to received LACP packets. If both sides are passive, no frames are sent and the EtherChannel fails to negotiate.
Determining dynamic channel formation rules requires evaluating LACP mode compatibility pairings (active-active or active-passive).
2
Verify physical interface parameter consistency
EtherChannel member interfaces must maintain identical speed, duplex, ST P settings, native VLAN, allowed VLANs, and access VLAN assignments. Incompatibilities cause individual ports to be put in an unbundled or suspended state.
Consistency across member interfaces prevents Layer 2 loops and blackholing of switched traffic.
3
Evaluate invalid distractor statements regarding IP configuration and LACP priority
LACP system priority defaults to 32768 and only comes into play during hot-standby port selection when bundling more links than allowed by hardware limits. IP addresses belong on the Port-channel interface for Layer 3 setups, not physical member ports.
Distinguishing essential prerequisites from optional tuning features eliminates false prerequisites.

Anahtar Kavram

LACP Interface Consistency and Mode Pairing Requirements
Tahmini Süre:2m 0s
Soru 1063Soru →

A network engineer analyzes a Wireshark capture of a custom network monitoring stream. The Layer 4 protocol header contains only four fields: Source Port (16 bits), Destination Port (16 bits), Length (16 bits), and Checksum (16 bits). Which statement accurately describes the operational behavior of this transport-layer protocol?

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Cevap: It provides connectionless, best-effort delivery with a fixed 8-byte header overhead and no inherent flow control or retransmission mechanisms.

Cevap

The protocol in the packet capture is UDP, which provides connectionless, best-effort delivery with a minimal 8-byte header structure and no native retransmission or flow control mechanisms.
The described header consists of four 16-bit fields totaling 64 bits (8 bytes): Source Port, Destination Port, Length, and Checksum. This structure uniquely identifies UDP. Because UDP has no flags, sequence numbers, acknowledgment fields, or windowing fields, it operates connectionlessly without guaranteeing delivery or providing flow control.

Adım Adım Çözüm

1
Calculate the total header size from the fields described in the prompt.
Source Port (16 bits) + Destination Port (16 bits) + Length (16 bits) + Checksum (16 bits) = 64 bits total, which equals 8 bytes.
Determining the total header length helps identify whether the protocol is TCP (minimum 20 bytes) or UDP (fixed 8 bytes).
2
Identify the protocol associated with this specific header structure.
The 8-byte header consisting solely of Source Port, Destination Port, Length, and Checksum corresponds to User Datagram Protocol (UDP).
UDP is designed for low overhead and fast delivery by omitting connection establishment and state tracking fields.
3
Evaluate the delivery properties of UDP compared to TCP.
UDP operates in a connectionless mode without acknowledgments, sequence numbering, or flow control (window size).
Upper-layer applications requiring low latency choose UDP and rely on upper layers if error handling or sequencing is needed.

Anahtar Kavram

UDP Header Structure and Protocol Characteristics
Tahmini Süre:1m 0s
Soru 1064Soru →

A network engineer is configuring a Layer 3 EtherChannel between two Cisco switches using Link Aggregation Control Protocol (LACP). Which two actions or configurations are required to ensure the EtherChannel forms successfully and routes IP traffic correctly? (Choose two.)

Geçerli olan tümünü seçin

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Cevap: Assign the IP address directly to the logical port-channel interface after configuring it as a routed interface using the no switchport command.; Configure the channel-group mode as active on one switch and passive on the opposing switch.

Cevap

The correct configurations are assigning the IP address directly to the logical port-channel interface (configured with the no switchport command) and matching an active LACP mode on one switch with a passive LACP mode on the opposing switch.
Layer 3 EtherChannels require IP addresses to be assigned to the logical port-channel interface configured with 'no switchport'. For dynamic LACP bundle creation, at least one switch must be set to active mode while the opposing switch can be passive.

Adım Adım Çözüm

1
Identify Layer 3 interface and IP addressing requirements for EtherChannel
Logical Port-Channel interface must have switchport capabilities removed ('no switchport') and receive the IP address assignment.
Layer 3 routing decisions occur at the aggregate logical interface level rather than on individual physical member ports.
2
Evaluate LACP negotiation mode compatibility matrix
Active-passive and active-active pairings form an EtherChannel bundle, whereas passive-passive pairings fail.
At least one side of the link aggregation bundle must actively transmit LACP frames to begin dynamic negotiation.
3
Verify protocol alignment between switches
PAgP modes (desirable/auto) cannot pair with LACP modes (active/passive).
Both endpoints must agree on the underlying aggregation protocol (LACP vs PAgP) for bundle negotiation to succeed.

Anahtar Kavram

Layer 3 EtherChannel Configuration and LACP Mode Negotiation
Soru 1065Soru →

An enterprise network administrator is evaluating the operational roles of different hardware and virtual components deployed across a branch office. Which two statements correctly describe the boundary handling and forwarding behaviors of these network components?

Geçerli olan tümünü seçin

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Cevap: Layer 3 switches establish distinct broadcast domains per VLAN and utilize internal routing hardware to forward IP packets between VLANs.; Routers separate broadcast domains at each routed interface and make packet forwarding decisions using destination Layer 3 IP addresses.

Cevap

The statements describing Layer 3 switches establishing distinct broadcast domains per VLAN with internal IP routing, and routers separating broadcast domains per routed interface using destination IP addresses, are both correct.
Layer 3 switches combine switching speed with Layer 3 IP routing functions, creating logical Layer 2 broadcast domains per configured VLAN and routing packets between them using internal Switch Virtual Interfaces (SVIs) or routed ports. Routers function at Layer 3 of the OSI model, naturally preventing broadcast frames from leaking across interfaces, thus isolating broadcast domains and forwarding traffic using network-layer destination IP addresses.

Adım Adım Çözüm

1
Analyze the role of Layer 2 switches, Layer 3 switches, and routers regarding collision and broadcast domains.
Layer 2 switches divide collision domains per port but maintain a single broadcast domain. Layer 3 switches use VLANs and internal routing to create and interconnect separate broadcast domains. Routers inherently break broadcast domains at every routed interface.
Understanding domain boundaries is fundamental to identifying the correct operational capabilities of network devices.
2
Evaluate hypervisor virtual switching capabilities.
Type 1 hypervisors implement internal virtual switches (vSwitches) to switch local traffic between VM virtual NICs internally.
Traffic between VMs on the same hypervisor host does not need to exit to an external physical switch unless configured for external monitoring or security policies.
3
Identify the two accurate statements based on the analysis.
The statement regarding Layer 3 switch VLAN routing and the statement regarding router Layer 3 interface forwarding are correct.
Both statements accurately reflect standard Cisco networking principles and hardware component roles.

Anahtar Kavram

Network Component Operational Roles and Broadcast Domain Boundaries
Tahmini Süre:1m 30s
Soru 1066Soru →

A network engineer is assigned the IPv4 network block 10.140.0.0/1810.140.0.0/18 to provision subnets for standard branch offices. Each branch office requires a subnet capable of accommodating at least 110110 usable host IP addresses. What is the maximum number of equal-sized subnets supporting this host requirement that can be created from the 10.140.0.0/1810.140.0.0/18 block?

Cevabı ve açıklamayı göster

Cevap: 128

Cevap

The maximum number of valid branch subnets that can be created is 128.
To support at least 110 usable hosts per subnet, 7 host bits are required (27−2=1262^7 - 2 = 126 usable hosts). Subtracting 7 host bits from 32 total IPv4 bits results in a /25/25 prefix length. Borrowing bits from the allocated /18/18 summary block gives 25−18=725 - 18 = 7 subnet bits. Therefore, 27=1282^7 = 128 valid subnets can be created.

Adım Adım Çözüm

1
Determine the required host bits for at least 110 usable host IP addresses.
7 host bits are required because 27−2=126≥1102^7 - 2 = 126 \ge 110, whereas 6 host bits (26−2=622^6 - 2 = 62) are insufficient.
Every IPv4 subnet reserves two IP addresses for the network ID and the broadcast ID, making the usable host formula 2h−22^h - 2.
2
Determine the required CIDR prefix length for each subnet.
The prefix length is /25/25 (32−7=2532 - 7 = 25).
An IPv4 address consists of 32 bits; subtracting the 7 host bits leaves 25 network bits.
3
Calculate the number of borrowed subnet bits relative to the parent block.
7 subnet bits are borrowed (25−18=725 - 18 = 7).
Extending the parent network prefix from /18/18 to /25/25 borrows 7 bits for subnetting.
4
Calculate the total number of /25/25 subnets within the /18/18 parent block.
The total number of subnets is 27=1282^7 = 128.
Borrowing nn subnet bits yields 2n2^n distinct subnets.

Anahtar Kavram

Calculating IPv4 subnet capacity and prefix derivation based on host requirements
Tahmini Süre:2m 0s
Soru 1067Soru →

A network administrator is evaluating virtualization architecture requirements for an enterprise branch deployment. The design calls for a bare-metal Type 1 hypervisor installation on physical host hardware. Which two operational characteristics are associated with this virtualization approach? (Select two.)

Geçerli olan tümünü seçin

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Cevap: The hypervisor installs directly on host hardware without requiring an underlying host operating system.; Virtual machines interact with hardware resources through a management software layer operating directly on bare metal.

Cevap

The correct characteristics of a Type 1 hypervisor architecture are that the hypervisor installs directly on host hardware without requiring an underlying host operating system, and virtual machines access physical hardware resources through a management software layer operating directly on bare metal.
Type 1 hypervisors (bare-metal) install and run directly on physical host hardware without a general-purpose host operating system underneath. As a result, the hypervisor directly controls physical CPU, memory, storage, and network interfaces, delivering higher performance and lower latency for tenant virtual machines.

Adım Adım Çözüm

1
Analyze the virtualization deployment requirement.
Identify that the scenario requires a bare-metal Type 1 hypervisor deployment.
Type 1 hypervisors interact directly with underlying physical hardware rather than relying on a host OS layer.
2
Compare Type 1 (bare-metal) and Type 2 (hosted) hypervisor operational traits.
Determine that Type 1 hypervisors execute on bare metal directly and manage hardware resources without an intermediate host operating system, while Type 2 hypervisors run as applications within a host OS.
Selecting the bare-metal characteristics correctly distinguishes Type 1 architecture from hosted Type 2 solutions.

Anahtar Kavram

Type 1 Bare-Metal Hypervisor Architecture vs Type 2 Hosted Hypervisor
Tahmini Süre:1m 30s
Soru 1068Soru →

An engineer executes the command `show lldp neighbors detail` on a Cisco Catalyst switch to troubleshoot connectivity with an adjacent multi-vendor switch. Below is an excerpt of the command output:

text
Local Intf: Gi0/1
Chassis id: 0025.9611.a480
Port id: Fa0/24
Port Description: Uplink to SW-1
System Name: SW-Edge-02
System Description: Non-Cisco Enterprise Switch OS v12.1
Time remaining: 105 seconds
System Capabilities: Bridge, Router
Enabled Capabilities: Bridge
Management Addresses:
IP: 10.1.100.2
Port VLAN ID: 30

Which statement accurately interprets the neighbor configuration and operational status based on this output?

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Cevap: The local switch interface GigabitEthernet0/1 is connected to port FastEthernet0/24 on the neighbor device SW-Edge-02, which is operating as a Layer 2 bridge.

Cevap

The local switch interface GigabitEthernet0/1 is connected to port FastEthernet0/24 on the neighbor device SW-Edge-02, which is operating as a Layer 2 bridge.
In Cisco IOS `show lldp neighbors detail` output, 'Local Intf' specifies the local interface receiving LLDP messages (GigabitEthernet0/1), while 'Port id' indicates the connected port on the neighbor device (FastEthernet0/24). Additionally, 'Enabled Capabilities' reflects the active operational feature set (Bridge), confirming that the neighbor is currently functioning as a Layer 2 switch on this link.

Adım Adım Çözüm

1
Analyze the Local Intf and Port id fields in the LLDP detailed output.
Local Intf is Gi0/1 (the local switch port) and Port id is Fa0/24 (the neighbor device's port).
LLDP explicitly differentiates between the receiving interface on the local switch and the transmitting port advertised by the adjacent neighbor.
2
Evaluate the capabilities fields reported for the neighbor device.
System Capabilities displays Bridge and Router, but Enabled Capabilities lists only Bridge.
Enabled Capabilities represents the active operational role of the neighboring device on the connection, whereas System Capabilities reflects all available hardware capabilities.
3
Examine the Port VLAN ID (PVID) field.
Port VLAN ID 30 is an informational TLV advertised by the neighbor.
Unlike CDP which generates native VLAN mismatch syslog errors when PVIDs mismatch on trunk links, LLDP merely reports the PVID TLV value.

Anahtar Kavram

Interpretation of detailed LLDP neighbor outputs, distinguishing local vs remote interfaces and system vs enabled capabilities.
Soru 1069Soru →

A network administrator enables an access switch interface connected to a workstation running standard IEEE 802.1D Spanning Tree Protocol (STP) without PortFast configured. Arrange the standard operational port states in the exact chronological sequence through which the interface transitions from initial link activation to full user data frame transmission.

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Cevap

The correct chronological sequence for standard IEEE 802.1D STP port state initialization is: Blocking state, Listening state, Learning state, and finally Forwarding state.
Under standard IEEE 802.1D Spanning Tree Protocol operational behavior, an interface enabling without PortFast goes through a strict multi-step sequence to prevent Layer 2 loops. It begins in the Blocking state (discarding data, listening to BPDUs), transitions to Listening (exchanging BPDUs, electing roles for 15 seconds), advances to Learning (exchanging BPDUs and building MAC address table for 15 seconds), and culminates in the Forwarding state (full data frame transmission and MAC learning).

Adım Adım Çözüm

1
Identify the initial state upon link bring-up.
The port initializes in the Blocking state where it drops frames and only listens to BPDUs to avoid loops.
802.1D forces ports to start in Blocking so they can detect BPDUs from neighbor switches before taking any active roles.
2
Determine the second state following election participation.
The port transitions to the Listening state for 15 seconds (Forward Delay).
In Listening state, the switch sends and receives BPDUs to clear invalid topology entries and elect Root/Designated ports without populating MAC tables or forwarding data.
3
Identify the state where MAC address learning begins.
The port transitions to the Learning state for another 15 seconds (Forward Delay).
In Learning state, the port learns source MAC addresses to pre-populate the MAC table, reducing unicast flooding prior to data forwarding.
4
Determine the final operational state.
The port transitions to the Forwarding state.
Having safely passed both Forward Delay periods without loop creation, the port now processes and forwards data traffic normally.

Anahtar Kavram

IEEE 802.1D Spanning Tree Protocol Port State Transitions
Tahmini Süre:2m 0s
Soru 1070Soru →

An administrator observes that workstations connected to switch port GigabitEthernet0/12 experience a 30-second delay before successfully acquiring an IP address from a DHCP server upon initial link up. The switch is running classic 802.1D Spanning Tree Protocol (STP). Which interface configuration command directly resolves this delay, and what is its operational effect on the port?

Cevabı ve açıklamayı göster

Cevap: Enable `spanning-tree portfast`; it allows the access port to immediately transition from blocking to forwarding state upon link up, bypassing listening and learning states.

Cevap

The command `spanning-tree portfast` resolves the issue because it allows an access interface connected to an end-user host to bypass the 15-second Listening and 15-second Learning states, transitioning directly to Forwarding state upon link up.
Enabling `spanning-tree portfast` on an access port connected to a workstation bypasses the standard 802.1D Listening (15 seconds) and Learning (15 seconds) STP states. The interface immediately enters the Forwarding state upon link up, allowing the host to successfully send DHCP requests without timing out.

Adım Adım Çözüm

1
Identify the cause of the 30-second delay during host initial boot.
Classic 802.1D STP transitions ports through Blocking → Listening (15s) → Learning (15s) → Forwarding (total 30s delay).
During the Listening and Learning states, data frames (including DHCP Discover messages) are dropped by the switch port.
2
Determine the appropriate Cisco IOS feature for edge ports connected to hosts.
Cisco STP PortFast immediately places edge access ports into the Forwarding state upon link activation.
Host workstations do not create Layer 2 loops, so waiting through convergence states is unnecessary and causes application/DHCP timeouts.

Anahtar Kavram

STP PortFast Benefits and Operation
Soru 1071Soru →

A network administrator is examining the operational mechanics of an IEEE 802.1Q trunk link connecting two Cisco switches. Which two statements accurately describe the frame tagging and forwarding behavior of IEEE 802.1Q trunking? (Select two.)

Geçerli olan tümünü seçin

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Cevap: Frames belonging to the native VLAN are forwarded untagged across the trunk link by default.; A 4-byte tag header containing the VLAN ID is inserted into the Ethernet frame header for non-native VLAN traffic.

Cevap

IEEE 802.1Q forwards native VLAN frames untagged by default and inserts a 4-byte VLAN tag header into Ethernet frames for all non-native VLAN traffic.
IEEE 802.1Q trunking inserts a 4-byte tag header (including the Tag Protocol Identifier and Tag Control Information) between the Source MAC address and EtherType fields of Ethernet frames for non-native VLAN traffic. For native VLAN traffic, frames are forwarded untagged across the link by default to maintain compatibility.

Adım Adım Çözüm

1
Analyze standard 802.1Q frame tagging mechanics.
Identify that 802.1Q inserts a 4-byte header into tagged frames and sends native VLAN frames untagged by default.
802.1Q maintains backwards compatibility with untagged legacy device traffic via the native VLAN concept while identifying other VLANs using the 4-byte tag field.
2
Evaluate the effects of native VLAN mismatches and PortFast configuration on trunk links.
Confirm that native VLAN mismatches lead to cross-VLAN traffic leakage rather than dropping frames, and PortFast on trunk links creates bridging loops.
PortFast bypasses Spanning Tree listening/learning phases, and untagged traffic is processed as belonging to the local native VLAN upon receipt regardless of the sender's VLAN ID.

Anahtar Kavram

IEEE 802.1Q Trunking Frame Tagging and Native VLAN Operations
Soru 1072Soru →

A network engineer is configuring a routed (Layer 3) EtherChannel between Switch-1 and Switch-2 using the Link Aggregation Control Protocol (LACP). On Switch-1, the engineer creates `interface Port-channel 5`, configures `no switchport`, and assigns an IP address. On physical interfaces GigabitEthernet0/1 and GigabitEthernet0/2, the engineer enters `no switchport` and `channel-group 5 mode passive`.

Which combination of commands must be configured on Switch-2 for the routed EtherChannel to successfully form and exchange LACP frames?

Cevabı ve açıklamayı göster

Cevap: Configure 'no switchport' on interface Port-channel 5 and both physical member interfaces, and set 'channel-group 5 mode active' on the physical interfaces.

Cevap

Configure 'no switchport' on interface Port-channel 5 and both physical member interfaces, and set 'channel-group 5 mode active' on the physical interfaces.
To establish an LACP EtherChannel bundle when Switch-1 is configured in passive mode, Switch-2 must be set to active mode so it actively sends LACP negotiation frames. Additionally, converting an EtherChannel to Layer 3 requires disabling switchport features using 'no switchport' on both the logical port-channel and the physical member interfaces.

Adım Adım Çözüm

1
Analyze the LACP negotiation mode requirement
Switch-1 is set to LACP passive mode, which only responds to LACP requests but does not initiate them.
For LACP to negotiate a bundle, at least one peer must be configured in active mode (Active-Passive or Active-Active).
2
Verify Layer 3 EtherChannel interface requirements
Both the logical Port-channel interface and physical member interfaces must be routed ports ('no switchport').
Layer 3 EtherChannels require consistent routed port configuration across the bundle, with IP addressing applied strictly to the logical Port-channel interface.

Anahtar Kavram

Layer 3 EtherChannel LACP Negotiation and CLI Configuration Requirements
Soru 1073Soru →

A switch port (FastEthernet0/12) needs to be assigned to the newly created Sales department VLAN (VLAN 45). Which Cisco IOS command must be executed within interface configuration mode to assign the port to VLAN 45?

Cevabı ve açıklamayı göster

Cevap: switchport access vlan 45

Cevap

The correct command to assign the interface to VLAN 45 is 'switchport access vlan 45'.
To assign an interface to a specific VLAN in Cisco IOS, the command 'switchport access vlan <vlan-id>' is executed under interface configuration mode.

Adım Adım Çözüm

1
Enter interface configuration mode for FastEthernet0/12.
The CLI prompt changes to Switch(config-if)#.
Interface-specific configurations must be applied directly under the target interface context.
2
Execute the command 'switchport access vlan 45'.
Interface FastEthernet0/12 is statically assigned to VLAN 45.
The 'switchport access vlan <vlan-id>' command defines the access VLAN membership for the port.

Anahtar Kavram

Static Access Port VLAN Membership Assignment
Tahmini Süre:45s
Soru 1074Soru →

A Cisco router interface with a burned-in MAC address of `d46d.5012.abcd` is configured with the command `ipv6 address 2001:db8:100:1::/64 eui-64`. What is the complete 128-bit IPv6 global unicast address assigned to this interface?

Cevabı ve açıklamayı göster

Cevap: 2001:db8:100:1:d66d:50ff:fe12:abcd; 2001:DB8:100:1:D66D:50FF:FE12:ABCD; 2001:db8:100:1:d66d:50ff:fe12:abcd/64; 2001:0db8:0100:0001:d66d:50ff:fe12:abcd

Cevap

2001:db8:100:1:d66d:50ff:fe12:abcd
To derive the IPv6 global unicast address using EUI-64, the router takes the assigned `/64` prefix `2001:db8:100:1::/64` and appends a 64-bit interface identifier generated from the interface's MAC address (`d46d.5012.abcd`). The MAC address is split into `d46d:50` and `12:abcd`, `FFFE` is inserted into the middle (`d46d:50ff:fe12:abcd`), and the 7th bit of the first byte is inverted (`d4` = `1101 0100` becomes `d6` = `1101 0110`). The final address is `2001:db8:100:1:d66d:50ff:fe12:abcd`.

Adım Adım Çözüm

1
Split the 48-bit MAC address into two 24-bit halves.
Left half: `d4:6d:50`, Right half: `12:ab:cd`.
EUI-64 process requires dividing the MAC address to insert the 16-bit midpoint padding.
2
Insert the 16-bit hexadecimal value `FFFE` between the two MAC halves.
Resulting 64-bit sequence: `d46d:50ff:fe12:abcd`.
EUI-64 expands a 48-bit MAC address into a 64-bit interface identifier using `FFFE`.
3
Invert the 7th bit (Universal/Local bit) of the first byte (`d4`).
Byte `d4` in binary is `1101 0100`. Inverting the 7th bit yields `1101 0110`, which is `d6` in hexadecimal. Modified interface identifier: `d66d:50ff:fe12:abcd`.
IEEE EUI-64 standard requires flipping the U/L bit (7th bit from left) to indicate global uniqueness.
4
Combine the configured `/64` IPv6 prefix with the modified 64-bit EUI-64 interface identifier.
Complete IPv6 address: `2001:db8:100:1:d66d:50ff:fe12:abcd`.
Appending the derived 64-bit Interface ID to the `2001:db8:100:1::/64` network prefix completes the 128-bit global unicast address.

Anahtar Kavram

Derivation of IPv6 EUI-64 Interface Identifier from a 48-bit MAC address
Tahmini Süre:2m 0s
Soru 1075Soru →

A network administrator is evaluating transport layer requirements for a enterprise deployment. The network deployment includes a batch database synchronization service requiring guaranteed in-order delivery and a real-time voice streaming application sensitive to delay. Which TWO features distinguish TCP from UDP in this operational environment? (Select TWO.)

Geçerli olan tümünü seçin

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Cevap: TCP utilizes dynamic windowing mechanisms to adjust data transmission flow based on receiver buffer capacity.; TCP maintains session state tracking using sequence and acknowledgment fields within a 20-byte baseline header.

Cevap

TCP is distinguished from UDP by its use of dynamic windowing for flow control and session state tracking via sequence/acknowledgment numbers in a 20-byte baseline header.
TCP is a connection-oriented, stateful transport protocol that uses sequence and acknowledgment numbers within a baseline 20-byte header to guarantee ordered delivery. Additionally, TCP employs sliding dynamic windowing to adjust traffic flow based on receiver buffer readiness. UDP, in contrast, uses a fixed 8-byte header and lacks connection handshake, sequence numbers, or flow control mechanisms.

Adım Adım Çözüm

1
Analyze transport protocol mechanics required for guaranteed data delivery vs. low-overhead streaming.
Identified TCP as connection-oriented/stateful and UDP as connectionless/stateless.
TCP maintains session state and flow control to guarantee delivery, whereas UDP minimizes header size and latency by avoiding session management.
2
Evaluate the functional features of TCP.
TCP uses a minimum 20-byte header with sequence numbers, acknowledgment numbers, and dynamic window size fields for flow control.
Dynamic windowing allows the receiver to specify how much data can be transmitted before an acknowledgment is required.
3
Evaluate the functional features of UDP.
UDP uses a simple 8-byte header consisting of source port, destination port, length, and checksum.
UDP lacks sequence fields, error recovery retransmissions, and handshake mechanics, giving it low overhead suitable for real-time applications.

Anahtar Kavram

TCP vs UDP Transport Layer Features
Soru 1076Soru →

An engineer executes a verification command on a Cisco Catalyst switch interface connected to a desktop computer:

text
Switch# show spanning-tree interface GigabitEthernet0/1 detail
Port 1 (GigabitEthernet0/1) of VLAN0010 is forwarding
Port path cost 4, Port priority 128.1, Port Identifier 128.1.
Designated root has priority 32778, address 0050.56be.1100
Designated bridge has priority 32778, address 0050.56be.1100
Designated port id is 128.1, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
The port is in the portfast mode
Link type is point-to-point by default
BPDU: sent 1420, received 0

Based on the command output, what will occur in the Spanning Tree Protocol domain when the desktop connected to GigabitEthernet0/1 undergoes a link state flap (disconnects and reconnects)?

Cevabı ve açıklamayı göster

Cevap: The interface immediately transitions to the Forwarding state upon link-up without generating Topology Change Notifications (TCNs) to upstream switches.

Cevap

The interface immediately transitions to the Forwarding state upon link-up without generating Topology Change Notifications (TCNs) to upstream switches.
When Cisco STP PortFast is enabled on an access interface, it provides two main benefits: immediate transition to the Forwarding state (bypassing the 15-second Listening and 15-second Learning states) and suppression of Topology Change Notification (TCN) messages. Because host connections frequently open and close applications or restart, suppressing TCNs prevents the switch from notifying the Root Bridge and forcing all domain switches to temporarily shorten their MAC address table aging timers to Forward Delay (15 seconds).

Adım Adım Çözüm

1
Analyze the CLI command output for operational features.
The output explicitly confirms 'The port is in the portfast mode'.
PortFast is enabled on GigabitEthernet0/1, which modifies default 802.1D STP state transition and notification logic.
2
Determine the impact of PortFast on port state transitions during link initiation.
The interface bypasses the 15-second Listening and 15-second Learning timer delays.
PortFast allows an access port connected to a host to move immediately from Blocking to Forwarding.
3
Determine the impact of PortFast on STP domain notifications during link flaps.
No Topology Change Notification (TCN) BPDUs are generated by the switch for this interface event.
Edge port state changes do not represent network topology alterations, so suppressing TCNs prevents unnecessary MAC table timer reductions across the entire switching domain.

Anahtar Kavram

Cisco STP PortFast Operational Mechanics and TCN Suppression
Tahmini Süre:1m 30s
Soru 1077Soru →

A network administrator is reviewing interface addressing rules and EUI-64 auto-configuration for an enterprise IPv6 rollout. Which two statements regarding IPv6 addressing characteristics and EUI-64 generation are correct? (Choose two.)

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Cevabı ve açıklamayı göster

Cevap: The 7th bit of the MAC address's first octet (the Universal/Local bit) is inverted when constructing the 64-bit interface identifier.; The 16-bit hex value `FFFE` is inserted directly between the third and fourth octets (the middle) of the 48-bit MAC address.

Cevap

The two correct statements are: (1) The 7th bit of the MAC address's first octet (the Universal/Local bit) is inverted when constructing the 64-bit interface identifier, and (2) The 16-bit hex value `FFFE` is inserted directly between the third and fourth octets (the middle) of the 48-bit MAC address.
The EUI-64 process takes a 48-bit MAC address, splits it into two 24-bit sections, inserts `FFFE` in the middle between the third and fourth octets, and flips the 7th bit (Universal/Local bit) of the first byte. Thus, both statements describing these EUI-64 steps are correct.

Adım Adım Çözüm

1
Analyze the EUI-64 expansion process for a 48-bit MAC address.
Confirm that the 48-bit MAC address is split into two 24-bit halves, inserting `FFFE` in the middle (between octet 3 and octet 4).
EUI-64 requires creating a 64-bit interface ID from a 48-bit MAC address by inserting `FFFE` into the center.
2
Analyze the bit inversion rule for EUI-64 generation.
Confirm that the 7th bit (Universal/Local bit) of the first byte of the MAC address is flipped from 0 to 1 (or 1 to 0).
RFC 4291 mandates modifying the 7th bit to reflect whether the address is globally unique.
3
Evaluate the IPv6 host reservation mechanics versus IPv4.
Recognize that IPv6 does not utilize broadcast addresses and does not subtract 2 addresses for broadcast and network IDs like IPv4.
Multicast replaces broadcast in IPv6, so standard IPv4 subnet host subtraction rules do not apply.

Anahtar Kavram

Modified EUI-64 Interface Identifier Generation and IPv6 Address Structure
Soru 1078Soru →

A network engineer wants to configure a switch as the primary root bridge for VLAN 20 using Rapid PVST+. What is the lowest valid base bridge priority value that can be specified in the configuration command before the System ID Extension is added?

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Cevap: 0

Cevap

The lowest valid base bridge priority value is 0.
In Rapid PVST+, the base bridge priority is configured in increments of 4096 due to the 12-bit System ID Extension field. The valid range for base priorities is 0 to 61440 in steps of 4096. Therefore, 0 is a valid value and represents the lowest possible base priority.

Adım Adım Çözüm

1
Identify the Rapid PVST+ bridge priority configuration rules.
Rapid PVST+ uses the 802.1t System ID Extension, which forces base bridge priority values to be configured in increments of 4096.
The 16-bit Bridge Priority field is divided into a 4-bit Priority field and a 12-bit System ID Extension (VLAN ID).
2
Determine the range of valid base priority values.
Valid base priority values are 0, 4096, 8192, 12288, ..., 61440.
The 4-bit priority multiplier allows values from 0×40960 \times 4096 up to 15×409615 \times 4096.
3
Select the lowest valid configured value.
The minimum allowed base priority is 0 (which results in a total priority of 0+20=200 + 20 = 20 for VLAN 20).
0 is the lowest multiple of 4096.

Anahtar Kavram

Rapid PVST+ Bridge Priority and System ID Extension Calculation
Soru 1079Soru →

A network engineer is configuring a virtualized data center host to support multiple enterprise server workloads. The installation utilizes a bare-metal (Type 1) hypervisor to manage virtual machine (VM) compute and virtual switch networking features. Which statement accurately describes the operational role and architecture of a Type 1 hypervisor in this deployment?

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Cevap: It runs directly on the bare-metal physical hardware, managing hardware resources and virtual switch packet forwarding without an underlying host operating system.

Cevap

A Type 1 hypervisor runs directly on the bare-metal physical hardware, managing hardware resources and virtual switch packet forwarding without an underlying host operating system.
A Type 1 hypervisor (such as Cisco UCS ESXi or KVM) installs directly onto the bare-metal hardware of a host machine. It provides direct hardware control, lower latency, and embedded software vSwitching capabilities to switch network frames between guest virtual machines and uplink to physical network infrastructure.

Adım Adım Çözüm

1
Identify hypervisor architectural types
Recognize that Type 1 hypervisors are bare-metal systems installed directly on host server hardware, whereas Type 2 hypervisors run inside a conventional host operating system.
Understanding the installation layer determines resource efficiency and management responsibilities.
2
Evaluate internal networking and component roles
A Type 1 hypervisor abstracts physical Network Interface Cards (NICs) and creates software virtual switches (vSwitches) to forward frames directly between co-located virtual machines.
Virtual switches handle local Layer 2 communication directly within host memory.

Anahtar Kavram

Hypervisor Types and Virtualization Architecture
Soru 1080Soru →

A network administrator enters the following command sequence on interface GigabitEthernet0/5 of a Cisco Catalyst switch:

text
Switch(config)# interface GigabitEthernet0/5
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 40

Prior to this configuration, VLAN 40 did not exist in the switch's VLAN database. Which TWO statements correctly describe the behavior and operational result of this configuration? (Select TWO.)

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Cevabı ve açıklamayı göster

Cevap: VLAN 40 is automatically created in the switch VLAN database if it does not currently exist.; Interface GigabitEthernet0/5 is assigned to VLAN 40 and sends/receives untagged traffic for that VLAN.

Cevap

VLAN 40 is automatically generated in the switch database if it was missing, and GigabitEthernet0/5 acts as an access port transmitting untagged frames within VLAN 40.
Executing 'switchport access vlan 40' automatically instantiates VLAN 40 in the switch database if it was not previously configured. Furthermore, setting an interface to access mode ensures it operates within a single VLAN and forwards standard untagged Ethernet frames to connected end-node devices.

Adım Adım Çözüm

1
Analyze the command sequence applied to GigabitEthernet0/5.
The interface mode is explicitly set to access ('switchport mode access') and assigned to VLAN 40 ('switchport access vlan 40').
Determines the operating characteristics and membership of the interface.
2
Evaluate Cisco IOS automatic VLAN creation behavior.
Cisco IOS automatically generates VLAN 40 in the VLAN database if it does not already exist when assigned to an access port.
Prevents port assignment failure due to uninitialized VLAN IDs.
3
Evaluate framing behavior for an access port.
Access ports belong to exactly one VLAN and process untagged frames for host endpoints.
Host NICs typically do not recognize or process 802.1Q tagged frames.

Anahtar Kavram

VLAN Auto-creation and Access Port Framing Behavior
Tahmini Süre:1m 30s
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