CCNA Mock Exam 81 — 25 Questions

Question 1

You are connected to Switch1. Configure an LACP EtherChannel between Switch1 and Switch2 using interfaces GigabitEthernet0/1 and GigabitEthernet0/2. The channel must be in active mode on both sides, and the port-channel interface must have VLAN 10 as the access VLAN. The current configuration has a speed/duplex mismatch and inconsistent VLAN assignments preventing the channel from forming. Verify the channel is up using 'show etherchannel summary'.

Accepted Answer

Set speed auto on Gi0/1 and Gi0/2, set duplex auto on both, change access VLAN on Gi0/2 to 10, change access VLAN on Port-channel1 to 10, and set channel-group mode active on both interfaces.. The EtherChannel is not forming due to three issues: (1) Speed mismatch: Gi0/1 is set to 100 Mbps while Gi0/2 is 1000 Mbps; both must match (e.g., auto). (2) Duplex mismatch: Gi0/1 is half-duplex, Gi0/2 is full-duplex; both must be the same (e.g., full). (3) VLAN mismatch: Gi0/1 is in VLAN 10, Gi0/2 in VLAN 20, and Port-channel1 is in VLAN 1; all access VLANs must be consistent (set to VLAN 10). Additionally, the channel-group mode should be 'active' on both interfaces for LACP. The solution involves setting speed and duplex to auto, changing the access VLAN on Gi0/2 and the port-channel to VLAN 10, and setting channel-group mode to active.

Answer

Set speed 1000 on Gi0/1, set duplex full on Gi0/1, change access VLAN on Gi0/1 to 20, change access VLAN on Port-channel1 to 20, and set channel-group mode passive on both interfaces.

Answer

Set speed 100 on Gi0/2, set duplex half on Gi0/2, change access VLAN on Gi0/1 to 20, change access VLAN on Port-channel1 to 20, and set channel-group mode desirable on both interfaces.

Answer

Set speed auto on Gi0/1 and Gi0/2, set duplex auto on both, change access VLAN on Gi0/1 to 10, change access VLAN on Port-channel1 to 10, and set channel-group mode active on Gi0/1 and passive on Gi0/2.

Question 2

You are connected to SW1. Configure an LACP EtherChannel between SW1 and SW2 using interfaces GigabitEthernet0/1 and GigabitEthernet0/2. The port-channel interface must be configured as a trunk allowing VLANs 10, 20, and 30. Currently, the channel is not forming due to a mismatch in speed/duplex and VLAN configuration on SW2. Troubleshoot and resolve the issue so that the EtherChannel comes up as a Layer 2 trunk.

Accepted Answer

On SW2, configure interfaces GigabitEthernet0/1 and 0/2 with speed 1000, duplex full, and on the port-channel interface, set allowed VLANs to 10,20,30.. The EtherChannel is not forming because SW2's interfaces have speed 100 and duplex half, while SW1's interfaces have speed 1000 and duplex full. Additionally, the allowed VLANs on SW2's trunk must include VLAN 30, and this should be configured on the port-channel interface, not the physical interfaces. To fix, on SW2, set the speed to 1000 and duplex to full on Gi0/1 and Gi0/2, then on the port-channel interface, configure allowed VLANs 10,20,30. After these changes, the channel will come up as a Layer 2 trunk.

Answer

On SW2, configure interfaces GigabitEthernet0/1 and 0/2 with speed 100, duplex half, and on the port-channel interface, set allowed VLANs to 10,20,30.

Answer

On SW2, configure interfaces GigabitEthernet0/1 and 0/2 with speed 1000, duplex full, and on the port-channel interface, set allowed VLANs to 10,20.

Answer

On SW2, configure interfaces GigabitEthernet0/1 and 0/2 with speed 1000, duplex full, and on the port-channel interface, set allowed VLANs to 1-4094.

Question 3

You are connected to SW1. An EtherChannel between SW1 and SW2 using LACP must be established on interfaces GigabitEthernet0/1 and GigabitEthernet0/2. Currently, the channel is not forming. Inspect the provided configuration and output, then apply the necessary commands on SW1 to resolve the issue and bring up the Port-Channel interface.

Accepted Answer

Configure both interfaces with speed 1000, duplex full, and switchport access vlan 1.. The EtherChannel failed because the two member interfaces on SW1 have mismatched speed (Gi0/1: 1000 Mbps, Gi0/2: 100 Mbps) and duplex (Gi0/1: full, Gi0/2: half), and their native VLANs differ (Gi0/1: VLAN 1, Gi0/2: VLAN 10). LACP requires all bundled ports to have identical speed, duplex, and VLAN configuration. To fix, on SW1 configure both interfaces with consistent settings: set speed 1000, duplex full, and switchport access vlan 1 (or a common trunk native VLAN). Also ensure both sides use the same LACP mode (both active or active/passive); here SW2's Gi0/2 is passive, which is acceptable with SW1's active, so the primary issue is the mismatched physical and VLAN parameters. After correction, the channel will form.

Answer

Change the LACP mode on SW1's Gi0/2 from active to passive.

Answer

Configure both interfaces with speed 100, duplex half, and switchport access vlan 10.

Answer

Remove the switchport access vlan command from both interfaces and configure them as trunk ports with native vlan 1.

Question 4

You are connected to SW1. The current configuration on SW1 is: interfaces GigabitEthernet0/1 and GigabitEthernet0/2 are set to channel-group mode passive; Gi0/1 has speed 100, duplex half, and access VLAN 20; Gi0/2 has speed 1000, duplex full, and access VLAN 10. You need to form an LACP EtherChannel between SW1 and SW2. Ensure the channel forms by setting the channel-group mode to active on SW1's member ports. Also correct the speed/duplex mismatch and VLAN mismatch so that the port-channel interface is in the up/up state. Finally, verify the EtherChannel summary shows the channel as a Layer 2 bundle in use.

Accepted Answer

Change channel-group mode to active on both ports, set speed 1000 and duplex full on Gi0/1, set access VLAN 10 on Gi0/2.. The EtherChannel fails because both member ports are set to mode passive, preventing LACP negotiation. Additionally, Gi0/1 has speed 100/duplex half while Gi0/2 has speed 1000/duplex full—a mismatch that causes one port to be suspended. Finally, the VLANs differ (10 vs 20), which also prevents bundling. The solution: change the channel-group mode to active on both ports, set consistent speed (1000) and duplex (full) on Gi0/1, and set the same access VLAN (10) on Gi0/2. After these corrections, the port-channel should form and show as (SU) in the summary.

Answer

Change channel-group mode to passive on both ports, set speed 100 and duplex half on Gi0/2, set access VLAN 20 on Gi0/1.

Answer

Change channel-group mode to desirable on both ports, set speed 1000 and duplex full on Gi0/1, set access VLAN 10 on Gi0/2.

Answer

Change channel-group mode to active on both ports, set speed 100 and duplex half on Gi0/1, set access VLAN 20 on Gi0/2.

Question 5

You are connected to Multilayer Switch SW1. Configure LACP EtherChannel between SW1 and SW2 using ports GigabitEthernet0/1 and GigabitEthernet0/2. Ensure the channel is formed and active. The current configuration has mismatched VLAN assignments and speed/duplex settings preventing the channel from coming up. Verify the channel state using 'show etherchannel summary'.

Accepted Answer

Configure both Gi0/1 and Gi0/2 with speed 1000, duplex full, and switchport trunk allowed vlan 10,20,30.. The EtherChannel is down because the two member ports on SW1 have inconsistent configurations. GigabitEthernet0/1 is set to speed 1000 and duplex full with allowed VLANs 10,20, while GigabitEthernet0/2 is set to speed 100 and duplex half with allowed VLAN 30. LACP requires all member ports to have identical speed, duplex, and VLAN allowed lists. To fix, on SW1 configure both Gi0/1 and Gi0/2 with the same speed (1000), duplex (full), and trunk allowed VLANs (10,20,30). The Port-channel interface already has the correct allowed VLANs. After correction, 'show etherchannel summary' should show both ports as bundled (P).

Answer

Configure both Gi0/1 and Gi0/2 with speed 100, duplex half, and switchport trunk allowed vlan 30.

Answer

Configure both Gi0/1 and Gi0/2 with speed 1000, duplex full, and switchport trunk allowed vlan 10,20.

Answer

Configure both Gi0/1 and Gi0/2 with speed 1000, duplex full, and switchport mode access.

Question 6

You are connected to SW1. Configure LACP EtherChannel between SW1 and SW2 using interfaces GigabitEthernet0/1 and GigabitEthernet0/2. Ensure the channel forms and passes traffic for VLAN 10. Troubleshoot and fix any issues preventing the channel from coming up.

Accepted Answer

Configure speed 1000 and duplex full on Gi0/2, change port-channel 1 to switchport mode trunk with allowed vlan 10, and set both Gi0/1 and Gi0/2 to channel-group 1 mode active.. The EtherChannel is not forming because of multiple mismatches: speed (1000 vs 100), duplex (full vs half), and the port-channel interface is configured as Layer3 (no switchport) while the member ports are Layer2 (switchport mode trunk). First, correct the speed and duplex on Gi0/2 to match Gi0/1 (speed 1000, duplex full). Then change the port-channel to switchport mode trunk and set the allowed VLAN. Finally, change the LACP mode on both interfaces to 'active' to initiate negotiation. After these changes, the channel should come up.

Answer

Configure speed 1000 and duplex full on Gi0/2, change port-channel 1 to no switchport, and set both Gi0/1 and Gi0/2 to channel-group 1 mode passive.

Answer

Configure speed 100 and duplex half on Gi0/1 to match Gi0/2, change port-channel 1 to switchport mode trunk with allowed vlan 10, and set both Gi0/1 and Gi0/2 to channel-group 1 mode active.

Answer

Configure speed 1000 and duplex full on Gi0/2, change port-channel 1 to switchport mode access with access vlan 10, and set both Gi0/1 and Gi0/2 to channel-group 1 mode desirable.

Question 7

You are connected to R1. Configure IPv4 and IPv6 static routes, default routes, and floating static routes so that R1 can reach the Internet via R2 (IPv4 and IPv6). The primary route to the Internet should use next-hop 203.0.113.2 (IPv4) and 2001:db8:203:0:113::2 (IPv6). A backup floating static route with administrative distance 200 must exist for IPv4 only, using next-hop 198.51.100.2. Ensure the default routes are correctly configured and troubleshoot any recursive routing failure. Note: R1 currently has an incorrect IPv6 default route pointing to 2001:db8:198:51:100::2 that must be removed.

Accepted Answer

Remove the incorrect IPv6 default route: no ipv6 route ::/0 2001:db8:198:51:100::2; configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2. The IPv4 floating route is already correctly pre-configured with AD 200 to serve as a backup. To meet the requirements, you must add the primary IPv4 default route with default AD 1, remove the existing incorrect IPv6 default route, and add the correct IPv6 default route. Option A correctly identifies these steps, while other options either omit the removal, assign a wrong AD to the primary route, or neglect IPv6 entirely.

Answer

Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; change the floating route AD to 1; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2

Answer

Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2 200; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2

Answer

Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; no IPv6 route is needed because IPv6 is not required.

Question 8

You are connected to R1 via the console. R1 has two directly connected interfaces: G0/0 to R2 (IPv4 only) and G0/1 to a LAN switch (dual stack). Your task: configure IPv4 and IPv6 default routes on R1 pointing to R2 (next-hop 10.0.0.2 and 2001:db8:1::2). Also configure a floating static route to 192.0.2.0/24 via R2 with an administrative distance of 10 (so it is used only if the directly connected route fails). The current running-config shows an incorrect static route that causes recursive routing failure. Identify and fix the issue.

Accepted Answer

Remove the incorrect static route 192.0.2.0 255.255.255.0 10.0.0.1 and add ip route 192.0.2.0 255.255.255.0 10.0.0.2 10. The static route to 192.0.2.0/24 uses next-hop 10.0.0.1, which is R1's own interface IP, not R2's. This causes recursive routing failure because the router tries to reach itself. The correct next-hop should be 10.0.0.2 (R2's G0/0 IP). Additionally, the floating static route must have a higher AD (10) so it is less preferred than the directly connected route (AD 0). Remove the incorrect route and add the correct floating static route with AD 10.

Answer

Remove the incorrect static route 192.0.2.0 255.255.255.0 10.0.0.1 and add ip route 192.0.2.0 255.255.255.0 10.0.0.2 1

Answer

Keep the existing static route and add ip route 192.0.2.0 255.255.255.0 10.0.0.2 10

Answer

Remove the incorrect static route 192.0.2.0 255.255.255.0 10.0.0.1 and add ip route 192.0.2.0 255.255.255.0 g0/0

Question 9

You are connected to R1. Configure OSPFv2 on R1 and R2 so that they form a full adjacency and can exchange routes. Currently, the adjacency is stuck in EXSTART state. Identify and fix the issue, then verify the adjacency becomes FULL.

Accepted Answer

On R1, configure 'ip ospf hello-interval 5' and 'ip ospf dead-interval 20' under interface GigabitEthernet0/0.. The adjacency is stuck in EXSTART because the OSPF hello and dead timers are mismatched between R1 and R2. R1 has hello-interval 10 and dead-interval 40, while R2 has hello-interval 5 and dead-interval 20. OSPF requires these timers to match for adjacency formation. To fix this, adjust the timers on R1 to match R2 (or vice versa). On R1, configure 'ip ospf hello-interval 5' and 'ip ospf dead-interval 20' under interface GigabitEthernet0/0. After correction, the adjacency should progress to FULL.

Answer

On R1, configure 'ip ospf network point-to-point' under interface GigabitEthernet0/0.

Answer

On R2, configure 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40' under interface GigabitEthernet0/0.

Answer

On R1, configure 'ip ospf dead-interval 40' under interface GigabitEthernet0/0.

Question 10

You have console access to both R1 and R2. Configure OSPFv2 on both routers to establish a single-area adjacency in area 0. The link between R1 and R2 uses 10.0.0.0/30. Currently, OSPF is not configured on either router. After configuration, verify the adjacency forms and routes are exchanged.

Accepted Answer

Configure 'router ospf 1' on R1 and R2, set router-id, and use 'network 10.0.0.0 0.0.0.3 area 0' on both routers.. The essential requirement is enabling OSPFv2 on both routers with matching area 0 on the 10.0.0.0/30 link. On R1 and R2, enter 'router ospf 1', set a unique router-id, and use 'network 10.0.0.0 0.0.0.3 area 0' to advertise the link. The solution commands include optional networks (192.168.1.0/24 and Loopback0) that are not required for the adjacency and are shown only as examples; candidates should focus on the link network. After configuration, 'show ip ospf neighbor' should show a FULL state. Common mistakes include using a subnet mask instead of a wildcard mask (option C) or a /32 wildcard (option D), and not configuring OSPF on R2 (option B).

Answer

Configure 'router ospf 1' on R1 only, and use 'network 10.0.0.0 0.0.0.3 area 0' on R1; R2 does not need OSPF configuration because it will learn routes via the directly connected interface.

Answer

Configure 'router ospf 1' on both routers, set router-id, and use 'network 10.0.0.0 255.255.255.252 area 0' on both routers.

Answer

Configure 'router ospf 1' on both routers, set router-id, and use 'network 10.0.0.0 0.0.0.0 area 0' on both routers.

Question 11

You are connected to R1. Configure single-area OSPFv2 on R1 and R2 so that they become fully adjacent. The link between them is 10.0.0.0/30, with R1 using G0/0 and R2 using G0/1. The current configuration has mismatched hello/dead timers: R1's G0/0 uses hello 10 and dead 40, while R2's G0/1 uses hello 30 and dead 120. Also, the 'passive-interface loopback0' command is missing on R1. Ensure OSPF is enabled in area 0, use router-id 1.1.1.1 on R1 and 2.2.2.2 on R2, and correct the timer mismatch.

Accepted Answer

On R2, configure 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40' under G0/1. On R1, configure 'passive-interface loopback0' under router ospf.. The adjacency fails because R2's G0/1 has hello/dead timers of 30/120, while R1's G0/0 uses 10/40. To fix, on R2 under interface G0/1, use 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40'. Additionally, R1's loopback0 is advertised via a /32 network statement but should be made passive to prevent OSPF hellos from being sent out (where no neighbor exists). On R1, configure 'passive-interface loopback0' under router ospf. After both changes, adjacency forms.

Answer

On R1, configure 'ip ospf hello-interval 30' and 'ip ospf dead-interval 120' under G0/0. On R2, configure 'passive-interface loopback0' under router ospf.

Answer

On R1, configure 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40' under G0/0. On R2, configure 'passive-interface loopback0' under router ospf.

Answer

On R2, configure 'ip ospf hello-interval 30' and 'ip ospf dead-interval 120' under G0/1. On R1, configure 'passive-interface loopback0' under router ospf.

Question 12

You are connected to R1 via the console. Configure single-area OSPFv2 on R1, R2, and R3 so that all three routers can exchange routes. The current configuration has mismatched hello/dead timers on the link between R1 and R2, and an area mismatch on the link between R2 and R3. Correct these issues and ensure OSPF adjacencies form.

Accepted Answer

On R2, configure interface G0/0 with 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40', and modify the OSPF network statement for 10.0.23.0/30 to area 0.. The adjacency between R1 and R2 fails because R1 has hello/dead timers of 10/40, while R2 has 30/120 on G0/0. The adjacency between R2 and R3 fails because R2's G0/1 is in area 1, but R3's G0/1 is in area 0. On R2, change the hello/dead timers on G0/0 to match R1 (10/40) using 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40'. Also change the network statement for 10.0.23.0/30 to area 0 using 'network 10.0.23.0 0.0.0.3 area 0'. Verify with 'show ip ospf neighbor' on all routers.

Answer

On R2, configure interface G0/0 with 'ip ospf hello-interval 30' and 'ip ospf dead-interval 120', and modify the OSPF network statement for 10.0.23.0/30 to area 1.

Answer

On R1, configure interface G0/0 with 'ip ospf hello-interval 30' and 'ip ospf dead-interval 120', and on R3, change the OSPF network statement for 10.0.23.0/30 to area 1.

Answer

On R1, configure interface G0/0 with 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40', and on R2, modify the OSPF network statement for 10.0.23.0/30 to area 1.

Question 13

You are connected to R1. Configure OSPFv2 on R1 and R2 so that they form a full adjacency and can exchange routes. The current configuration has mismatched hello/dead timers blocking the adjacency. Adjust only the necessary settings on R1 to match R2's OSPF timers.

Accepted Answer

Configure 'ip ospf hello-interval 5' and 'ip ospf dead-interval 20' on R1's GigabitEthernet0/0 interface.. The adjacency between R1 and R2 is not forming because the OSPF hello and dead timers are mismatched. R1 has default timers (Hello 10, Dead 40) while R2 has custom timers (Hello 5, Dead 20). To form an adjacency, OSPF timers must match on both ends. On R1, you need to configure the OSPF interface timers to match R2 by issuing 'ip ospf hello-interval 5' and 'ip ospf dead-interval 20' on interface GigabitEthernet0/0. After applying these commands, the adjacency should come up.

Answer

Configure 'ip ospf hello-interval 10' and 'ip ospf dead-interval 40' on R2's interface to match R1's default timers.

Answer

Configure 'ip ospf hello-interval 5' on R1's GigabitEthernet0/0 interface only; the dead interval will adjust automatically.

Answer

Configure 'ip ospf dead-interval 20' on R1's GigabitEthernet0/0 interface only; the hello interval will adjust automatically.

Question 14

You are connected to R1, a router that must establish OSPFv3 adjacency with R2 over the directly connected link G0/0. The current configuration is incomplete: OSPFv3 process is configured but not enabled on the interface, and global IPv6 unicast routing is missing. Configure R1 so that it becomes an OSPFv3 neighbor with R2 and learns the loopback route 2001:db8:1:2::/64 via OSPFv3. Then verify neighbor state and routing table.

Accepted Answer

Enable IPv6 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.. R1 is missing two critical configurations: global IPv6 unicast routing must be enabled with 'ipv6 unicast-routing', and OSPFv3 must be activated on GigabitEthernet0/0 using 'ipv6 ospf 1 area 0' under the interface. Without these, R1 cannot send or receive OSPFv3 hellos, so no adjacency forms and routes are not exchanged. After applying both commands, the neighbor state becomes FULL and the remote loopback appears in the IPv6 routing table.

Answer

Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'network' command under the OSPFv3 router configuration mode.

Answer

Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'router-id' command to ensure adjacency.

Answer

Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'passive-interface default' command to allow adjacency.

Question 15

You are connected to R1, a Cisco router that must establish OSPFv3 adjacency with R2 over its GigabitEthernet0/0 link. The link uses IPv6 addresses 2001:db8:1:1::1/64 on R1 and 2001:db8:1:1::2/64 on R2. R1 currently has IPv6 unicast routing enabled but no OSPFv3 process configured. Configure R1 so that it forms a full OSPFv3 neighbor relationship with R2 and installs the loopback network 2001:db8:2:2::/64 (advertised by R2) into its IPv6 routing table.

Accepted Answer

ipv6 router ospf 1
router-id 1.1.1.1
interface GigabitEthernet0/0
 ipv6 ospf 1 area 0. R1 requires OSPFv3 configuration: enable the process with 'ipv6 router ospf 1', set a router-id, then enable OSPFv3 on the interface with 'ipv6 ospf 1 area 0'. Option B incorrectly attempts to use a network command (OSPFv2 syntax). Option C sets a point-to-point network type, which on a broadcast link will mismatch with R2's default broadcast type and prevent adjacency. Option D changes the hello interval to 5, causing a timer mismatch and adjacency failure.

Answer

ipv6 router ospf 1
router-id 1.1.1.1
interface GigabitEthernet0/0
 ipv6 ospf 1 area 0
 network 2001:db8:1:1::0/64 area 0

Answer

ipv6 router ospf 1
router-id 1.1.1.1
interface GigabitEthernet0/0
 ipv6 ospf 1 area 0
 ipv6 ospf network point-to-point

Answer

ipv6 router ospf 1
router-id 1.1.1.1
interface GigabitEthernet0/0
 ipv6 ospf 1 area 0
 ipv6 ospf hello-interval 5

Question 16

You are connected to R1 via the console. R1 and R2 are running HSRP for the VLAN 10 subnet 192.168.10.0/24. Currently both routers are active for group 10, causing instability. Configure R1 so that it becomes the active router when its G0/0 interface is up, and R2 takes over only if R1's G0/0 fails. Also correct the virtual IP address to 192.168.10.1. Verify with show standby brief.

Accepted Answer

On R1: interface GigabitEthernet0/0, standby 10 ip 192.168.10.1, standby 10 preempt, standby 10 track GigabitEthernet0/0 decrement 60. On R2: standby 10 preempt.. The dual-active state was caused by R1 having an incorrect virtual IP address (192.168.10.254 instead of 192.168.10.1), making it active for a different HSRP group. Correcting the VIP to 192.168.10.1 on R1 aligns both routers to the same group. Enabling preempt on R2 (and it should already be enabled on R1) allows R1 to reclaim the active role after the VIP correction. Additionally, interface tracking with a decrement of 60 ensures that if R1's G0/0 fails, R1's priority drops below 100, allowing R2 to take over.

Answer

On R1: interface GigabitEthernet0/0, standby 10 ip 192.168.10.1, standby 10 preempt, standby 10 track GigabitEthernet0/0 decrement 10. On R2: no additional configuration.

Answer

On R1: interface GigabitEthernet0/0, standby 10 ip 192.168.10.1, standby 10 preempt, standby 10 track GigabitEthernet0/0 decrement 60. On R2: no additional configuration.

Answer

On R1: interface GigabitEthernet0/0, standby 10 ip 192.168.10.254, standby 10 preempt, standby 10 track GigabitEthernet0/0 decrement 60. On R2: standby 10 preempt.

Question 17

You are connected to R1. Configure OSPFv3 for IPv6 so that R1 and R2 can exchange IPv6 routes over their directly connected link. Enable IPv6 routing, assign OSPFv3 process and area on the interface, and verify that the neighbor adjacency forms and routes appear in the IPv6 routing table.

Accepted Answer

Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route ospf'.. Option A is correct because it includes enabling IPv6 routing with 'ipv6 unicast-routing', applying OSPFv3 to the interface using 'ipv6 ospf 1 area 0', and verifying with the correct OSPFv3-specific commands 'show ospfv3 neighbor' and 'show ipv6 route ospf'. Option B is incorrect because it adds a global 'router ospfv3 1' command, which is unnecessary; OSPFv3 can be configured directly on the interface without a global process. Option C is incorrect because it uses IPv4 OSPF verification commands 'show ip ospf neighbor' and 'show ip route ospf', which are not valid for OSPFv3. Option D is incorrect because although it uses the correct 'show ospfv3 neighbor', the 'show ipv6 route' command does not filter to OSPF-learned routes, so it displays all IPv6 routes rather than just OSPF routes.

Answer

Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 globally with 'router ospfv3 1' and 'router-id 1.1.1.1', then assign the interface to area 0 with 'ipv6 ospf 1 area 0'.

Answer

Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ip ospf neighbor' and 'show ip route ospf'.

Answer

Enable IPv6 routing with 'ipv6 unicast-routing', configure OSPFv3 on the interface with 'ipv6 ospf 1 area 0', and verify with 'show ospfv3 neighbor' and 'show ipv6 route'.

Question 18

You are connected to R1. The network uses HSRP to provide first-hop redundancy for VLAN 10 clients. R1 should be the active router with a priority of 150, preempt enabled, and should track interface GigabitEthernet0/1 (decrement priority by 20 if it goes down). The virtual IP is 192.168.10.254. Currently, both routers are active for the same group. Fix the configuration on R1 so that it becomes the active router and preempts when possible.

Accepted Answer

interface Vlan10
 standby 10 ip 192.168.10.254
 standby 10 priority 150
 standby 10 preempt
 standby 10 track GigabitEthernet0/1 20. Both routers are active for HSRP group 10 because the virtual IP address is not configured or is mismatched, causing a split-brain scenario. The correct fix must include setting the virtual IP with 'standby 10 ip 192.168.10.254', raising R1's priority to 150, enabling preempt, and tracking GigabitEthernet0/1 with a decrement of 20. Option A supplies all required commands with proper syntax. Other options either omit the vital IP configuration or have invalid keywords like 'decrement' or 'preempt delay'.

Answer

interface Vlan10
 standby 10 ip 192.168.10.254
 standby 10 priority 150
 standby 10 preempt
 standby 10 track GigabitEthernet0/1 20 decrement

Answer

interface Vlan10
 standby 10 ip 192.168.10.254
 standby 10 priority 150
 standby 10 preempt delay 20
 standby 10 track GigabitEthernet0/1

Answer

interface Vlan10
 standby 10 ip 192.168.10.254
 standby 10 priority 150
 standby 10 preempt
 standby 10 track GigabitEthernet0/1 20 priority

Question 19

You are connected to R1 via console. Configure OSPFv3 for IPv6 on both R1 and R2 so that the loopback0 interface on R2 (IPv6 address 2001:db8:1:2::1/64) is reachable from R1. The link between R1 and R2 uses the subnet 2001:db8:1:1::/64 with R1's G0/0 having IPv6 address 2001:db8:1:1::1/64 and R2's G0/0 having 2001:db8:1:1::2/64. OSPFv3 process ID must be 100 and all interfaces must be in area 0. After configuration, verify OSPFv3 neighbors and the IPv6 route to the loopback0 network.

Accepted Answer

On R1: ipv6 router ospf 100, router-id 1.1.1.1, interface g0/0: ipv6 ospf 100 area 0. On R2: ipv6 router ospf 100, router-id 2.2.2.2, interface g0/0: ipv6 ospf 100 area 0, interface loopback0: ipv6 ospf 100 area 0.. To achieve reachability to R2's loopback, OSPFv3 must be enabled on R1's and R2's G0/0 interfaces in area 0, and on R2's loopback0 so its prefix is advertised. Option A shows the minimal correct configuration. Option B omits enabling OSPF on loopback0, so the route to 2001:db8:1:2::/64 is not advertised. Option C incorrectly uses the 'network' command, which is not supported in OSPFv3; OSPFv3 relies on interface-level 'ipv6 ospf ... area' commands. Option D adds 'passive-interface GigabitEthernet0/0', which prevents OSPF from forming a neighbor adjacency on the link, breaking the required connectivity.

Answer

On R1: ipv6 router ospf 100, router-id 1.1.1.1, interface g0/0: ipv6 ospf 100 area 0. On R2: ipv6 router ospf 100, router-id 2.2.2.2, interface g0/0: ipv6 ospf 100 area 0. No configuration on loopback0.

Answer

On R1: ipv6 router ospf 100, router-id 1.1.1.1, interface g0/0: ipv6 ospf 100 area 0. On R2: ipv6 router ospf 100, router-id 2.2.2.2, interface g0/0: ipv6 ospf 100 area 0, interface loopback0: ipv6 ospf 100 area 0, and also configure 'network 2001:db8:1:2::/64 area 0' under the OSPFv3 process.

Answer

On R1: ipv6 router ospf 100, router-id 1.1.1.1, interface g0/0: ipv6 ospf 100 area 0. On R2: ipv6 router ospf 100, router-id 2.2.2.2, interface g0/0: ipv6 ospf 100 area 0, interface loopback0: ipv6 ospf 100 area 0, and also configure 'passive-interface GigabitEthernet0/0' under the OSPFv3 process.

Question 20

You are connected to R1. Configure OSPFv3 for IPv6 on R1 and R2 so that they can exchange IPv6 routes. R1's GigabitEthernet0/0 is connected to R2's GigabitEthernet0/0. R1 has a loopback0 with IPv6 address 2001:db8:1::1/32, and R2 has a loopback0 with IPv6 address 2001:db8:2::2/32. Ensure OSPFv3 is enabled on both routers, the link interfaces are in area 0, and R1 learns the loopback route from R2.

Accepted Answer

Configure 'ipv6 ospf 1 area 0' under GigabitEthernet0/0 and Loopback0 on both routers.. The provided configuration enables OSPFv3 on the interfaces, which is necessary, but it does not set a router-id. OSPFv3 requires a router-id to form adjacencies. Without any IPv4 addresses configured, the router-id defaults to 0.0.0.0, preventing neighbor formation and route exchange. Therefore, a valid solution must also include a router-id command under the OSPFv3 process (e.g., 'ipv6 router ospf 1' followed by 'router-id X.X.X.X').

Answer

Configure 'ipv6 router ospf 1' and then 'network 2001:db8:2::2/32 area 0' under the OSPFv3 process.

Answer

Configure 'ipv6 unicast-routing' and 'ipv6 ospf 1 area 0' under the global configuration.

Answer

Configure 'router ospf 1' and then 'ipv6 unicast-routing' under the OSPFv3 process.