Tüm alıştırma soruları

1987 soru

Soru 1421Soru

A network engineer is implementing security monitoring across an enterprise campus using a centralized Cisco Wireless LAN Controller (WLC) architecture. The security policy requires dedicated access points to continuously scan all 802.11 channels for rogue devices and radio frequency (RF) interference without broadcasting SSIDs, accepting client associations, or handling user data traffic. Which Cisco Lightweight Access Point (AP) mode should be configured on these access points?

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Cevap: Monitor mode

Cevap

Monitor mode
Monitor mode is specifically designed for dedicated wireless security monitoring and intrusion detection (WIPS). In this mode, the AP radio does not transmit client beacon signals or accept client associations. Instead, it systematically cycles through all configured channels to collect statistics, detect rogue access points, calculate location metrics, and monitor RF health.

Adım Adım Çözüm

1
Identify the operational constraints specified in the scenario.
The AP must continuously scan channels, detect rogues, measure RF noise/interference, and not serve client connections or transmit beacons.
Security monitoring requires a dedicated RF sensor rather than a client-facing access point.
2
Evaluate Cisco Lightweight Access Point modes against these requirements.
In Monitor mode, the AP radio does not transmit to serve clients; it continuously cycles through all configured channels to gather location, WIPS, and rogue AP detection metrics.
This matches all security and functional requirements without interfering with regular client traffic.

Anahtar Kavram

Cisco Lightweight Access Point Operational Modes
Tahmini Süre:1m 0s
Soru 1422Soru

An enterprise edge router dynamically learns the network prefix 10.50.40.0/24 from an internal switch via Internal EIGRP (Administrative Distance 90). A network administrator needs to configure a floating static backup route for this prefix using the next-hop IPv4 address 192.168.254.2 across a secondary connection. Which Cisco IOS command correctly configures the floating static route so that it remains inactive in the routing table until the primary EIGRP path fails?

Cevabı ve açıklamayı göster

Cevap: ip route 10.50.40.0 255.255.255.0 192.168.254.2 95

Cevap

ip route 10.50.40.0 255.255.255.0 192.168.254.2 95
The correct option uses standard subnet mask notation (255.255.255.0) and specifies an administrative distance of 95. Because 95 is higher than Internal EIGRP's administrative distance of 90, the router retains this static route as an inactive backup and installs it into the IPv4 routing table only if the EIGRP path becomes unavailable.

Adım Adım Çözüm

1
Determine the administrative distance of the primary route.
Internal EIGRP has a default administrative distance of 90.
Floating static routes must have an administrative distance strictly greater than the active primary routing protocol to stay hidden from the routing table during normal operation.
2
Evaluate Cisco IOS IPv4 static route syntax requirements.
The command syntax requires 'ip route <prefix> <mask> <next-hop-ip> [administrative-distance]'.
Subnet masks must be written in standard dotted-decimal notation (e.g., 255.255.255.0) rather than inverse wildcard notation.
3
Select the option with valid CLI syntax and an administrative distance higher than 90.
The command setting an administrative distance of 95 satisfies all criteria.
An administrative distance of 95 ensures the static route remains floating until the primary EIGRP route with AD 90 is withdrawn.

Anahtar Kavram

Floating Static Route Administrative Distance Selection
Soru 1423Soru

Router R1 learns paths to remote subnet 192.168.100.0/24192.168.100.0/24 from two dynamic routing protocols: an Internal EIGRP path with an administrative distance of 90 and an OSPF path with an administrative distance of 110. An engineer must configure a floating static route pointing to next-hop 10.1.1.210.1.1.2 that remains dormant in the routing table and only activates if both dynamic paths fail. Which command must be configured on R1?

Cevabı ve açıklamayı göster

Cevap: ip route 192.168.100.0 255.255.255.0 10.1.1.2 115

Cevap

The command 'ip route 192.168.100.0 255.255.255.0 10.1.1.2 115' correctly configures the floating static route.
The correct command specifies an administrative distance of 115. Cisco IOS routers select routes for insertion into the routing table based on the lowest administrative distance. Because EIGRP has an AD of 90 and OSPF has an AD of 110, an AD value higher than 110 (such as 115) ensures the static route is ignored as long as either EIGRP or OSPF delivers a valid path. It will only be installed into the routing table as a floating backup when both dynamic routes are removed.

Adım Adım Çözüm

1
Identify administrative distances of all active routing sources for destination 192.168.100.0/24
Internal EIGRP has AD = 90; OSPF has AD = 110.
Floating static routes rely on administrative distance values to dictate route installation hierarchy.
2
Determine the required administrative distance for the backup floating static route
The static route AD must be strictly greater than 110 (e.g., 115).
To ensure the static route activates only when BOTH dynamic paths (AD 90 and AD 110) are lost, its AD must exceed the highest AD of the active primary dynamic routes.
3
Select the command matching the syntax 'ip route <prefix> <mask> <next-hop> <distance>'
'ip route 192.168.100.0 255.255.255.0 10.1.1.2 115'
This command specifies destination 192.168.100.0/24 via next-hop 10.1.1.2 with an administrative distance of 115.

Anahtar Kavram

Floating Static Route Administrative Distance Selection
Soru 1424Soru

A Cisco router, R4, has the following interface states and IPv4 configurations:

- Loopback0: 192.168.250.1/24 (line protocol is down)
- Loopback1: 172.20.100.1/24 (line protocol is up)
- Loopback2: 10.100.1.1/24 (line protocol is up)
- GigabitEthernet0/0: 192.168.1.1/30 (line protocol is up)
- GigabitEthernet0/1: 10.254.254.1/30 (line protocol is up)

An engineer initially configures the router with the following commands:

text
router ospf 100
router-id 1.1.1.1

Later, the engineer enters subconfiguration mode and executes `no router-id 1.1.1.1`. To force the OSPF process to recalculate its router ID, the engineer executes `clear ip ospf process` and confirms the action.

What IPv4 address will R4 select as its operational OSPFv2 router ID?

Cevabı ve açıklamayı göster

Cevap: 172.20.100.1

Cevap

172.20.100.1
When the explicit `router-id` command is removed and the OSPF process is cleared using `clear ip ospf process`, OSPF fallback election logic applies. OSPF selects the highest IPv4 address among operational (up/up) loopback interfaces. Although Loopback0 has the highest loopback IP (192.168.250.1), its line protocol is down, excluding it from election. Between active loopbacks Loopback1 (172.20.100.1) and Loopback2 (10.100.1.1), Loopback1 has the higher numerical IPv4 address (172.20.100.1).

Adım Adım Çözüm

1
Evaluate explicit router-id configuration
The explicit `router-id 1.1.1.1` command was negated via `no router-id 1.1.1.1`.
When the explicit router ID command is removed and the OSPF process is cleared, OSPF reverts to automatic selection logic.
2
Identify operational loopback interfaces
Loopback1 (172.20.100.1) and Loopback2 (10.100.1.1) are operational (up/up). Loopback0 (192.168.250.1) is down.
OSPF router ID selection prioritizes active (up/up) loopback interfaces over physical interfaces, but inactive/down interfaces cannot be selected regardless of IP value.
3
Compare active loopback IPv4 addresses to select highest IP
Comparing 172.20.100.1 and 10.100.1.1 yields 172.20.100.1 as the highest IPv4 address.
Among all operational loopback interfaces, the highest numerical IPv4 address is selected as the router ID upon process restart.

Anahtar Kavram

OSPFv2 Router ID Selection Priority Logic
Tahmini Süre:1m 30s
Soru 1425Soru

A network technician needs to connect a router FastEthernet interface directly to a server FastEthernet interface without using an intermediate switch. Both device interfaces have Auto-MDIX disabled. The technician terminates the first end of an Ethernet cable using the T568B standard (Pin 1: White/Orange, Pin 2: Orange, Pin 3: White/Green, Pin 6: Green). Which color wiring pinout must be used on the opposite RJ-45 connector to ensure a functional connection?

Cevabı ve açıklamayı göster

Cevap: Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange (T568A standard)

Cevap

Terminating the opposite end using the T568A standard (Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange) creates a functional crossover cable by crossing transmit pins 1 and 2 with receive pins 3 and 6.
Because both the router and server act as DTE devices, transmitting on pins 1 and 2 and receiving on pins 3 and 6, connecting them directly without Auto-MDIX requires a crossover cable. Terminating one end with T568B and the other with T568A ensures that the transmit pins on one end connect directly to the receive pins on the other.

Adım Adım Çözüm

1
Identify the roles of the interconnected devices and Auto-MDIX status
Both the router interface and server interface act as DTE devices that transmit on pins 1 and 2 and receive on pins 3 and 6.
Direct connection between like DTE devices requires a crossover cable when Auto-MDIX is unavailable to automatically swap pin assignments.
2
Determine the standard pinout requirement for an Ethernet crossover cable
One end must be terminated with T568B and the opposing end terminated with T568A.
This configuration swaps pair 2 (orange, pins 1 and 2) with pair 3 (green, pins 3 and 6).
3
Select the correct T568A wire sequence for the second connector
Pin 1: White/Green, Pin 2: Green, Pin 3: White/Orange, Pin 6: Orange.
Matching T568A on the second end aligns the first end's transmit pins with the second end's receive pins.

Anahtar Kavram

Ethernet Crossover Cable Pinout (T568A to T568B)
Tahmini Süre:1m 0s
Soru 1426Soru

A Cisco IOS router receives an IPv4 packet destined for host 192.168.2.45192.168.2.45. The router's routing table contains a static route configured as `ip route 192.168.2.0 255.255.255.0 10.1.1.2`. Place the processing steps the router executes to resolve the exit interface and encapsulate the packet in the correct sequential order from first to last.

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Cevap

The correct sequential order for recursive static route lookup and forwarding is: 1) Match destination IP against the routing table to select the static route; 2) Identify next-hop IP address 10.1.1.2; 3) Perform a recursive lookup in the routing table for 10.1.1.2; 4) Match the connected route 10.1.1.0/24 to determine exit interface GigabitEthernet0/1; 5) Retrieve the ARP table entry for 10.1.1.2 to encapsulate and transmit the frame.
When a static route is configured using only a next-hop IP address (e.g., `ip route 192.168.2.0 255.255.255.0 10.1.1.2`), Cisco IOS must execute a recursive lookup process. The router first matches the packet destination IP (192.168.2.45192.168.2.45) against the static route in the routing table. Second, it identifies the configured next-hop IP (10.1.1.210.1.1.2). Third, it performs a secondary (recursive) lookup for 10.1.1.210.1.1.2 in the routing table. Fourth, it finds the directly connected route (10.1.1.0/2410.1.1.0/24), revealing the physical egress interface (GigabitEthernet0/1). Fifth, it queries the ARP table for the MAC address belonging to 10.1.1.210.1.1.2 to build the Ethernet frame and transmit it out GigabitEthernet0/1.

Adım Adım Çözüm

1
Evaluate the incoming packet's destination IPv4 address.
The router matches host destination 192.168.2.45192.168.2.45 to static prefix 192.168.2.0/24192.168.2.0/24.
Routing decisions start by determining the longest matching prefix for the destination IP address.
2
Inspect forwarding parameters specified in the matched static route entry.
The router determines that the route specifies next-hop IP address 10.1.1.210.1.1.2.
Static routes configured strictly with a next-hop IP address do not directly name an exit interface.
3
Execute a recursive lookup for IP address 10.1.1.210.1.1.2.
The router searches the RIB for a route covering 10.1.1.210.1.1.2.
Recursive resolution is mandatory when a next-hop IP is used without an explicit exit interface specification.
4
Resolve the next-hop IP to a connected network route.
The router matches 10.1.1.210.1.1.2 to connected network 10.1.1.0/2410.1.1.0/24 on interface GigabitEthernet0/1.
The connected route provides the physical exit interface necessary to transmit the traffic.
5
Query the ARP table and perform Layer 2 frame encapsulation.
The destination MAC address associated with 10.1.1.210.1.1.2 is acquired and the frame is transmitted via GigabitEthernet0/1.
Multi-access Ethernet media require resolving the next-hop IPv4 address to its target MAC address before physical transmission.

Anahtar Kavram

Recursive Routing Lookup for IPv4 Static Routes
Soru 1427Soru

Refer to the following Cisco IOS command output executed on router R1:

text
R1# show ip ospf interface GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
Internet Address 192.168.1.1/24, Area 0
Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3
Backup Designated router (ID) 2.2.2.2, Interface address 192.168.1.2

If the Designated Router (3.3.3.3) fails, which role will router R1 assume on this multiaccess network segment?

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Cevap: It will remain in the DROTHER state and will not participate in the election.

Cevap

Router R1 will remain in the DROTHER state and cannot become the DR or BDR because its interface priority is set to 0.
In OSPFv2 broadcast network types, setting an interface's OSPF priority to 0 disables DR/BDR election eligibility for that interface. Even if the current DR or BDR fails, the router remains in the DROTHER state.

Adım Adım Çözüm

1
Examine the interface command output for R1's OSPF priority value.
The output displays 'Priority 0' and 'State DROTHER' for interface GigabitEthernet0/0.
An OSPF interface priority value of 0 explicitly designates the interface as ineligible for DR/BDR election.
2
Evaluate the effect of DR failure on a router with priority 0.
The existing Backup Designated Router (2.2.2.2) promotes to DR, but R1 remains DROTHER because its priority of 0 prevents election qualification.
Routers configured with priority 0 are permanently excluded from DR and BDR roles on broadcast networks.

Anahtar Kavram

OSPF Interface Priority 0 DR/BDR Exclusion
Soru 1428Soru

Router R1 learns the primary route to destination network 10.50.0.0/1610.50.0.0/16 via OSPF, which has a default Administrative Distance of 110. A network engineer must configure a static backup route to the same network that remains inactive in the routing table until the OSPF route fails. Which Administrative Distance value must be assigned to the static route?

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Cevap: 120

Cevap

120
A floating static route functions as a backup path by configuring its Administrative Distance (AD) to be higher than the AD of the primary routing protocol. Since OSPF has an AD of 110, setting the static route's AD to 120 ensures it is kept out of the routing table until the primary OSPF route becomes unavailable.

Adım Adım Çözüm

1
Identify the Administrative Distance (AD) of the primary dynamic routing protocol.
OSPF has a primary AD of 110.
Cisco IOS selects routes based on lower Administrative Distance values when multiple paths to the same destination exist.
2
Determine the required AD relationship for a floating static backup route.
The static route AD must be strictly greater than 110.
A floating static route must have a higher AD than the primary route so it remains hidden until the primary route disappears.
3
Select the option with an AD greater than 110.
120 is greater than 110.
Using an AD of 120 keeps the static route out of the routing table during normal operation.

Anahtar Kavram

Floating Static Route Administrative Distance Configuration
Tahmini Süre:45s
Soru 1429Soru

A network administrator is verifying the IPv6 dynamic address configuration on a host interface. The host interface has a burned-in MAC address of `0012.7F34.5678`. Which two statements correctly describe the process and result of generating the interface identifier and IPv6 address using standard EUI-64?

Geçerli olan tümünü seçin

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Cevap: The hexadecimal string `FFFE` is inserted into the middle of the 48-bit MAC address to expand it to 64 bits.; The resulting 64-bit interface identifier for the host is `0212:7fff:fe34:5678`.

Cevap

The correct statements are that FFFE is inserted into the midpoint of the 48-bit MAC address and that the resulting 64-bit interface identifier is 0212:7fff:fe34:5678.
Generating an IPv6 EUI-64 interface identifier requires two key transformations on a 48-bit MAC address: inserting the hexadecimal value FFFE between the OUI and the vendor-assigned payload (the middle 16 bits) and inverting the 7th bit (Universal/Local bit) of the first byte. For MAC address 0012.7F34.5678, inserting FFFE produces 0012:7FFF:FE34:5678, and flipping the 7th bit converts the first byte from 00 to 02, producing 0212:7fff:fe34:5678.

Adım Adım Çözüm

1
Split MAC address and insert FFFE
Splitting `00-12-7F` and `34-56-78` and placing `FF-FE` in the middle yields `00-12-7F-FF-FE-34-56-78`.
EUI-64 standard requires expanding a 48-bit MAC address to 64 bits by inserting FFFE into the middle.
2
Invert the 7th bit (Universal/Local bit)
The first byte `00` in binary is `0000 0000`. Inverting the 7th bit (bit index 1 from right in 0-indexed byte) yields `0000 0010`, which equals `02` in hex.
EUI-64 specifies that the 7th bit of the first byte must be inverted to indicate local scope within the IPv6 address framework.
3
Format as IPv6 Interface Identifier
Combining the modified first byte with the rest gives `0212:7fff:fe34:5678`.
IPv6 interface identifiers are formatted in four 16-bit hexadecimal quads separated by colons.

Anahtar Kavram

IPv6 EUI-64 Interface Identifier Derivation
Soru 1430Soru

A network engineer is troubleshooting outbound connectivity failures on a Cisco IOS router. Internal devices on subnet 10.0.10.0/2410.0.10.0/24 can establish a maximum of two concurrent Internet connections. Additional hosts experience connection timeouts. The output of `show ip nat statistics` displays:

Total active translations: 2 (0 static, 2 dynamic, 0 extended)
Outside interfaces: GigabitEthernet0/1
Inside interfaces: GigabitEthernet0/0
Hits: 842 Misses: 412
Dynamic mappings:
-- Inside Source
[id 1] access-list 10 pool PUBLIC_POOL refcount 2
pool PUBLIC_POOL: netmask 255.255.255.252
start 198.51.100.1 end 198.51.100.2
type generic, total addresses 2, allocated 2 (100%), misses 412

The current running configuration contains `ip nat inside source list 10 pool PUBLIC_POOL`.

Which configuration change on the router will allow all internal hosts on subnet 10.0.10.0/2410.0.10.0/24 to share the existing pool addresses concurrently without adding new public IP addresses?

Cevabı ve açıklamayı göster

Cevap: Append the overload keyword to the ip nat inside source list 10 pool PUBLIC_POOL command.

Cevap

Append the overload keyword to the ip nat inside source list 10 pool PUBLIC_POOL command.
Appending the overload keyword to the inside source pool configuration enables Port Address Translation (PAT). Under PAT, Cisco IOS tracks Layer 4 source port numbers in extended translation entries, allowing multiple internal hosts to simultaneously share a small pool of public IP addresses.

Adım Adım Çözüm

1
Analyze the show ip nat statistics output
The pool PUBLIC_POOL has a total of 2 addresses, both are allocated (100%), and 412 misses have occurred.
Without PAT, dynamic NAT allocates public IP addresses from the pool on a 1-to-1 basis. Once all addresses in the pool are exhausted, subsequent translation requests fail.
2
Identify the missing Port Address Translation (PAT) parameter
The running configuration shows `ip nat inside source list 10 pool PUBLIC_POOL` without the `overload` keyword.
Without `overload`, Cisco IOS performs standard dynamic 1-to-1 NAT rather than PAT (many-to-1 or many-to-few multiplexing using L4 port numbers).
3
Determine the corrective configuration command
Update the command to `ip nat inside source list 10 pool PUBLIC_POOL overload`.
The `overload` keyword enables PAT, allowing thousands of internal sockets to share the 2 public IP addresses in the pool simultaneously.

Anahtar Kavram

Port Address Translation (PAT) with NAT Pools
Soru 1431Soru

A network administrator is troubleshooting neighbor discovery between a Cisco Catalyst switch and an adjacent third-party switch. Global LLDP is enabled on the Cisco switch using the 'lldp run' command. The Cisco switch successfully detects the neighbor on interface GigabitEthernet0/1, but the neighbor does not receive any discovery frames from the Cisco switch. Which interface configuration command must be applied to GigabitEthernet0/1 to resolve this issue?

Cevabı ve açıklamayı göster

Cevap: lldp transmit

Cevap

The command 'lldp transmit' applied under interface configuration mode enables outbound LLDP frame transmission on that specific interface.
On Cisco Catalyst switches, LLDP allows transmit and receive functions to be enabled or disabled independently on each interface. The 'lldp transmit' command under interface mode activates outbound frame transmission so neighboring devices can discover the local switch.

Adım Adım Çözüm

1
Analyze the reported symptom.
The local Cisco switch receives neighbor information but does not transmit LLDP frames on GigabitEthernet0/1.
LLDP allows granular directional control (transmit and receive) per interface.
2
Identify the command controlling directional LLDP transmission.
Entering interface configuration mode and executing 'lldp transmit' enables outbound advertisement frames.
When global LLDP is enabled ('lldp run'), individual interfaces can still have transmission disabled ('no lldp transmit').

Anahtar Kavram

LLDP Interface Directional Control Commands
Tahmini Süre:1m 0s
Soru 1432Soru

An enterprise router R1 learns an internal EIGRP route to the destination network 10.50.40.0/2410.50.40.0/24 with an Administrative Distance of 90. A network administrator attempts to configure a floating static backup route for this target subnet via next-hop address 192.168.12.2192.168.12.2 by issuing the command `ip route 10.50.40.0 255.255.255.0 192.168.12.2 85`. Which statement accurately describes the operational impact of this configuration on router R1?

Cevabı ve açıklamayı göster

Cevap: The static route immediately replaces the primary EIGRP route in the active routing table because its configured Administrative Distance of 85 is lower than EIGRP's Administrative Distance of 90.

Cevap

The static route pre-empts the primary EIGRP route and becomes the primary active route in the routing table because its configured Administrative Distance of 85 is lower than internal EIGRP's Administrative Distance of 90.
In Cisco IOS routing, when multiple routing sources provide a path to the exact same prefix, the router installs the route with the lowest Administrative Distance (AD). Internal EIGRP has a default AD of 90. By setting the static route's AD to 85, the static route is considered more trustworthy than EIGRP and immediately pre-empts the EIGRP route in the routing table.

Adım Adım Çözüm

1
Identify the Administrative Distance (AD) of the primary dynamic protocol.
Internal EIGRP has a default AD of 90.
Administrative Distance represents trustworthiness; lower values are preferred.
2
Analyze the configured static route parameter.
The command specifies an explicit AD metric of 85 (`ip route 10.50.40.0 255.255.255.0 192.168.12.2 85`).
The final optional integer argument in an `ip route` command sets the custom AD value.
3
Compare the AD values of both sources for the exact same destination prefix.
Static AD (85) < EIGRP AD (90).
To create a floating static route (backup), the configured AD MUST be higher than the primary route's AD (e.g., > 90). Setting it lower causes the static route to pre-empt the primary dynamic route.

Anahtar Kavram

Floating Static Route Administrative Distance Selection
Soru 1433Soru

A network administrator needs to provision a new VLAN for the Sales department (VLAN 50, named SALES) on a Cisco Catalyst switch and assign interface GigabitEthernet0/5 as a static access port belonging to this VLAN. Place the following Cisco IOS commands in the correct sequential order from privileged EXEC mode to complete this configuration.

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Cevap

The correct sequence starts with entering global configuration mode (`configure terminal`), followed by creating VLAN 50 (`vlan 50`), naming it (`name SALES`), accessing interface configuration mode (`interface GigabitEthernet0/5`), setting static access mode (`switchport mode access`), and assigning the port to VLAN 50 (`switchport access vlan 50`).
Cisco IOS requires navigating through a strict prompt hierarchy. The administrator must first enter global configuration mode (`configure terminal`), instantiate and name the VLAN (`vlan 50` followed by `name SALES`), navigate to the specific interface (`interface GigabitEthernet0/5`), set the port operational mode to access (`switchport mode access`), and finally bind the access port to VLAN 50 (`switchport access vlan 50`).

Adım Adım Çözüm

1
Execute `configure terminal` at the privileged EXEC prompt (`Switch#`).
Enters global configuration mode (`Switch(config)#`).
Global configuration mode is the entry point for defining system-level entities such as VLANs.
2
Execute `vlan 50`.
Creates VLAN 50 and moves to VLAN configuration mode (`Switch(config-vlan)#`).
VLAN ID 50 must be created before assigning a descriptive name or configuring interface membership.
3
Execute `name SALES`.
Names VLAN 50 as SALES.
VLAN names are assigned inside config-vlan subconfiguration mode.
4
Execute `interface GigabitEthernet0/5`.
Enters interface configuration mode (`Switch(config-if)#`).
Interface parameters must be modified from within the target interface's configuration prompt.
5
Execute `switchport mode access`.
Sets the administrative mode of GigabitEthernet0/5 to access.
Configuring explicit access mode prevents DTP trunk negotiation and secures the port.
6
Execute `switchport access vlan 50`.
Associates interface GigabitEthernet0/5 with VLAN 50.
Places untagged traffic entering GigabitEthernet0/5 into broadcast domain 50.

Anahtar Kavram

Cisco IOS hierarchical configuration sequence for VLAN creation and static access port assignment.
Tahmini Süre:1m 30s
Soru 1434Soru

A network engineer is configuring Layer 2 discovery protocols across an enterprise network that includes both Cisco and non-Cisco hardware. Which two statements correctly describe the operational characteristics, default timers, or CLI configuration syntax for CDP and LLDP on Cisco Catalyst switches? (Select two)

Geçerli olan tümünü seçin

Cevabı ve açıklamayı göster

Cevap: CDP uses default advertisement and holdtime timers of 60 seconds and 180 seconds respectively, whereas LLDP defaults to a 30-second advertisement timer and a 120-second holdtime.; When LLDP is enabled globally, bidirectional neighbor discovery on a specific interface requires both 'lldp transmit' and 'lldp receive' commands under interface configuration mode.

Cevap

The two correct statements are: 1) CDP defaults to 60-second update and 180-second holdtime timers while LLDP defaults to 30-second update and 120-second holdtime timers; and 2) LLDP requires both 'lldp transmit' and 'lldp receive' interface commands for bidirectional operation once enabled globally.
CDP operates using a 60-second update interval and a 180-second holdtime by default. In contrast, LLDP uses a 30-second update interval and a 120-second holdtime. Additionally, LLDP interface submode commands decouple transmitting and receiving discovery frames into 'lldp transmit' and 'lldp receive', both of which are required for bidirectional neighbor identification.

Adım Adım Çözüm

1
Analyze default timer specifications for CDP and LLDP
CDP timer = 60s, holdtime = 180s. LLDP timer = 30s, holdtime = 120s (multiplier of 4).
Memorization and verification of protocol operational defaults.
2
Evaluate LLDP interface configuration semantics
LLDP allows separate control over packet transmission ('lldp transmit') and reception ('lldp receive') per interface.
Understanding inter-vendor discovery protocol control granularity.
3
Evaluate global configuration commands and IEEE standards
'no cdp run' disables CDP globally across all ports. LLDP is standardized under IEEE 802.1AB.
Differentiating global vs interface scope commands and protocol standards.

Anahtar Kavram

CDP and LLDP operational differences, default timers, and interface configuration commands
Soru 1435Soru

A network administrator is configuring a newly created Wireless LAN (WLAN) on a Cisco Wireless LAN Controller (WLC) using the GUI. The administrator must map client traffic on this WLAN to a specific VLAN interface and ensure the network is active for client association. Which TWO settings are located directly under the General tab of the WLAN configuration page?

Geçerli olan tümünü seçin

Cevabı ve açıklamayı göster

Cevap: Selecting the appropriate dynamic interface or interface group from the Interface/Interface Group drop-down menu; Selecting the Status checkbox to enable the WLAN for client connections

Cevap

The correct settings located under the General tab are selecting the appropriate dynamic interface from the Interface/Interface Group drop-down menu and selecting the Status checkbox to enable the WLAN.
On a Cisco WLC GUI, the General tab for a WLAN contains fundamental operational settings including Profile Name, SSID, Status (enabled/disabled), and Interface/Interface Group binding. Choosing the appropriate interface maps the WLAN to a specific VLAN, and checking Status activates the WLAN for wireless client association.

Adım Adım Çözüm

1
Identify the parameters configured on the General tab during Cisco WLC WLAN setup.
The General tab contains parameters such as Profile Name, SSID, Status (Enabled/Disabled), Radio Policy, and Interface/Interface Group mapping.
These basic operational settings define the identity, network mapping, and operational state of the WLAN.
2
Evaluate the requirement to map client traffic to a specific VLAN and enable client association.
Mapping client traffic requires selecting the target interface under Interface/Interface Group, and enabling client association requires checking the Status checkbox.
Both of these configuration fields reside directly within the General tab.
3
Distinguish General tab parameters from Security tab parameters.
WPA2 security policies and RADIUS server configurations are located under the Security tab (Layer 2 sub-tab and AAA Servers sub-tab respectively).
Security and authentication mechanisms are isolated in dedicated sub-tabs under the Security main menu.

Anahtar Kavram

Cisco WLC GUI WLAN General Tab Configuration
Tahmini Süre:1m 30s
Soru 1436Soru

An administrator configures OSPFv2 on a Cisco router with an active Loopback0 interface assigned IP address 10.254.1.1/32 and an active GigabitEthernet0/0 interface assigned IP address 172.20.10.1/24. Within OSPF router configuration mode, the administrator executes the command `router-id 1.1.1.1`. What IP address will the router process select as its OSPF Router ID upon initialization?

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Cevap: 1.1.1.1

Cevap

1.1.1.1
The explicit `router-id` command takes highest priority in OSPFv2 Router ID selection. Therefore, 1.1.1.1 is selected as the Router ID.

Adım Adım Çözüm

1
Evaluate the OSPF Router ID election priority rules.
The selection order is: 1) Manually configured `router-id` command, 2) Highest IPv4 address on active loopback interfaces, 3) Highest IPv4 address on active physical interfaces.
An explicit manual configuration takes top priority and overrides dynamic interface election logic.
2
Apply the parameters given in the scenario to determine the winning Router ID.
Because `router-id 1.1.1.1` is explicitly configured under the OSPF process, the router selects 1.1.1.1 regardless of Loopback0 (10.254.1.1) or GigabitEthernet0/0 (172.20.10.1).
Interface IP addresses are only evaluated when an explicit `router-id` command is absent.

Anahtar Kavram

OSPFv2 Router ID Selection Precedence
Soru 1437Soru

During initial topology convergence for a VLAN running Rapid PVST+, switches exchange BPDUs to determine which switch assumes the Root Bridge role. Place the evaluation criteria steps in the correct order, from the first criterion evaluated to the final step establishing the Root Bridge.

Öğeleri doğru sıraya koymak için sürükleyin

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Cevap

The correct sequence begins with comparing base priority values, adding the System ID Extension to calculate total priority, using the lowest MAC address as a tie-breaker if priorities match, and concluding with designating the switch with the lowest overall Bridge ID as the Root Bridge.
In Rapid PVST+, Root Bridge election follows a strict hierarchy based on the Bridge ID (BID). Switches first compare base bridge priority, add the System ID Extension (VLAN ID) to establish total priority, resolve any ties using the lowest MAC address, and finally designate the switch with the overall lowest BID as the Root Bridge.

Adım Adım Çözüm

1
Evaluate Base Bridge Priority
Identifies the base priority component configured on each participating switch.
Base priority is the primary configurable metric evaluated in the Bridge ID.
2
Incorporate System ID Extension
Combines base priority and VLAN ID into the effective 16-bit priority value.
Rapid PVST+ requires unique per-VLAN bridge priorities by appending the VLAN number.
3
Evaluate MAC addresses for tie-breaking
Determines the winning switch when total priorities are identical.
The 48-bit switch MAC address serves as a unique secondary tie-breaker.
4
Confirm Root Bridge election outcome
The switch with the lowest resulting BID becomes the Root Bridge.
All switches in the spanning-tree domain recognize the switch with the lowest BID as Root.

Anahtar Kavram

Rapid PVST+ Root Bridge Election and Bridge ID Evaluation
Soru 1438Soru

A network engineer is configuring IPv6 static routes on a Cisco router to forward traffic to the destination network 2001:db8:acad:10::/642001:\text{db8}:\text{acad}:10::/64. The primary path must use the neighbor's link-local address fe80::2\text{fe80}::2 via the local exit interface GigabitEthernet0/0/1. A secondary floating static route must use the global unicast next-hop address 2001:db8:acad:3::22001:\text{db8}:\text{acad}:3::2 with an administrative distance of 130. Which two commands must be configured on the router?

Geçerli olan tümünü seçin

Cevabı ve açıklamayı göster

Cevap: ipv6 route 2001:db8:acad:10::/64 gigabitethernet0/0/1 fe80::2; ipv6 route 2001:db8:acad:10::/64 2001:db8:acad:3::2 130

Cevap

The two correct commands are the fully specified static route using interface GigabitEthernet0/0/1 with link-local next-hop fe80::2, and the static route specifying next-hop 2001:db8:acad:3::2 with administrative distance 130.
The command specifying GigabitEthernet0/0/1 alongside fe80::2 correctly formats a fully specified IPv6 static route using a link-local next-hop address. The command specifying 2001:db8:acad:3::2 followed by 130 correctly configures a floating static route with an administrative distance of 130.

Adım Adım Çözüm

1
Identify the mandatory syntax requirement for IPv6 static routes using link-local next-hop addresses.
Link-local addresses (fe80::/10) are non-routable and ambiguous without a specific local interface identifier. Therefore, the command must include the local exit interface alongside the link-local next-hop address.
Cisco IOS requires a fully specified route format whenever a link-local address serves as the next hop.
2
Evaluate the administrative distance configuration for the backup floating static route.
The backup route uses global unicast next-hop 2001:db8:acad:3::2 and requires an administrative distance higher than the primary route (default AD = 1), so 130 must be appended to the command.
Floating static routes remain inactive in the routing table until the primary route fails, which occurs only if their administrative distance is higher than the primary route's AD.

Anahtar Kavram

IPv6 Static Route Command Syntax and Floating Static Route AD Configuration
Soru 1439Soru

A network administrator is troubleshooting an OSPFv2 connection between two directly connected routers, R1 and R2, over a point-to-point Ethernet link. Executing `show ip ospf neighbor` on R1 reveals that the neighbor state for R2 is perpetually stuck in the `EXSTART/ -` state.

Which misconfiguration is the most likely root cause of this neighbor adjacency state?

Cevabı ve açıklamayı göster

Cevap: The interface MTU setting on R1 does not match the interface MTU setting on R2.

Cevap

The interface MTU setting on R1 does not match the interface MTU setting on R2.
In OSPFv2, routers exchange Database Description (DBD) packets during the EXSTART and EXCHANGE states to negotiate Master/Slave roles and initial sequence numbers. The DBD packet header explicitly contains the originating interface's MTU setting. If the MTU values on the interconnected interfaces do not match, the router with the smaller MTU will drop DBD packets that exceed its size or reject incoming DBDs carrying a higher MTU value. As a result, the neighbor negotiation stalls and remains stuck in the EXSTART (or EXCHANGE) state.

Adım Adım Çözüm

1
Analyze OSPF Neighbor States and Hello exchange requirements
Parameters like Area ID, Hello/Dead timers, Subnet Mask, and Authentication must match in Hello packets to form 2-Way neighbor state.
If Hello packet parameters mismatch, the routers cannot form a bidirectional 2-Way relationship.
2
Analyze the EXSTART/EXCHANGE state behavior
In EXSTART, routers elect a Master/Slave relationship and exchange initial Database Description (DBD) packets containing the interface MTU value.
OSPF includes its interface MTU in the DBD packet header. If receiving router MTU is lower than sender MTU (or MTU mismatch enforcement is active), DBD packets are ignored or dropped.
3
Determine the root cause of neighbor stuck in EXSTART state
Mismatched interface MTU values cause DBD retransmissions and prevent the routers from completing ExStart/Exchange into Loading and Full states.
The correct solution identifies interface MTU mismatch as the primary cause of an OSPF neighbor relationship becoming stuck in EXSTART.

Anahtar Kavram

OSPFv2 Neighbor States and MTU Mismatch Behavior
Tahmini Süre:2m 0s
Soru 1440Soru

You are configuring a secondary gateway path on a corporate router for destination subnet 192.168.88.0/24 via next-hop IP address 10.5.5.2. The primary active route is learned dynamically via OSPF, which carries a default administrative distance of 110. What is the lowest administrative distance integer value that must be assigned at the end of the CLI command to ensure this static route functions as a floating backup route?

Aşağıdaki boşlukları doldurun

ip route 192.168.88.0 255.255.255.0 10.5.5.2
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Cevap

111
A floating static route acts as a backup path and only enters the routing table when the primary routing path fails. Because Cisco routers prefer routes with lower administrative distance values, a floating static route must have an administrative distance higher than the primary route protocol. Since OSPF has a default administrative distance of 110, the lowest integer value that makes the static route floating is 111.

Adım Adım Çözüm

1
Identify the administrative distance of the primary route.
The primary route is learned via OSPF, which has a default administrative distance of 110.
Cisco routers use administrative distance to rank route trustworthiness, preferring lower values.
2
Determine the minimum administrative distance required for a floating static backup route.
To ensure the static route remains inactive while OSPF is operational, its administrative distance must be strictly greater than 110.
The lowest integer greater than 110 is 111.

Anahtar Kavram

Floating Static Route Administrative Distance Selection
Tahmini Süre:45s
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