Q1. Which two parameters must match between neighboring OSPF routers in order to form an adjacency? (Choose two.)
- router ID
- IP address
- process ID
- cost
- hello / dead timers
- network types
Explanation: To form a neighbor relationship between OSPF speaking routers, the routers should reside on the same network and have the same hello and dead intervals. Others criteria that must match are area ID and network type.
Q2. Which command can be used to view the OSPF hello and dead time intervals?
- show ip protocols
- show ip ospf interface
- show ip ospf neighbor
- show ip ospf route
Explanation: The OSPF hello and dead timers can be configured per interface. Hence, the correct command used to view the timers is the show ip ospf interface command. Adding the interface name and number to the command displays output for a specific interface.
Q3. A network administrator is troubleshooting an OSPFv3 configuration on an IPv6 network. The administrator issues the show ipv6 protocols command. What is the purpose for this command?
- to verify that the router has formed an adjacency with its neighboring routers
- to display the OSPFv3 parameters configured on an interface
- to display the OSPFv3 learned routes in the routing table
- to verify OSPFv3 configuration information
Explanation: There are various show commands to help troubleshoot or verify OSPFv3, including these:
show ipv6 protocols – used to verify configuration information
show ipv6 ospf neighbor – used to verify that the router has formed an adjacency with its neighboring routers
show ipv6 ospf interface – used to display the OSPFv3 parameters configured on an interface
show ipv6 route ospf – used to display only the OSPFv3 learned routes in the routing table
show ipv6 protocols – used to verify configuration information
show ipv6 ospf neighbor – used to verify that the router has formed an adjacency with its neighboring routers
show ipv6 ospf interface – used to display the OSPFv3 parameters configured on an interface
show ipv6 route ospf – used to display only the OSPFv3 learned routes in the routing table
Q4. A network administrator has just changed the router ID on a router that is working in an OSPFv2 environment. What should the administrator do to reset the adjacencies and use the new router ID?
- Issue the clear ip ospf process privileged mode command.
- Configure the network statements.
- Change the interface priority.
- Change the OSPFv2 process ID.
Explanation: If the router ID has changed on a working router, the OSPFv2 process must be cleared for the new router ID to take effect.
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Q7. A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected?
- The dead interval will now be 60 seconds.
- The dead interval will now be 30 seconds.
- The dead interval will not change from the default value.
- The dead interval will now be 15 seconds.
Explanation: No answer description available for this question
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Q10. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. A network administrator is configuring multiarea OSPFv3 on the routers. The routing design requires that the router RT1 is a DROTHER for the network in Area 0 and the DR for the network in Area 1. Check the settings and status of the routers. What can the administrator do to ensure that RT1 will meet the design requirement after all routers restart?
- Use the ipv6 ospf priority 0 command on the interface g0/0 of RT1.
- Use the ipv6 ospf priority 10 command on the interface g0/2 of RT1.
- Configure the loopback 0 interface with 6.6.6.6.
- Restart all routers except for RT1.
- Change the router ID to 5.5.5.5 on RT1.
Explanation: In a multiarea OSPF network, if the interface priority is the same for all routers, then the router with highest router ID becomes the DR and the router with second highest router ID becomes BDR. Changing the router ID can influence the DR/BDR election. However, for an ABR, the same router ID will be used for DR/BDR elections for multiple areas. In this case, it is better to use the interface priority value to manage the DR/BDR election for different areas, because this value is interface specific.
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Q13. What three states are transient OPSF neighbor states that indicate a stable adjacency is not yet formed between two routers? (Choose three.)
- established
- loading
- 2way
- exstart
- full
- exchange
Explanation: Only the full and 2way states indicate that a stable adjacency is formed. The loading, exstart, and exchange states are transitory states between the 2way and full states.
Q14. An administrator is troubleshooting OSPFv3 adjacency issues. Which command would the administrator use to confirm that OSPFv3 hello and dead intervals are matching between routers?
- show ipv6 ospf interface
- show ipv6 ospf
- show ipv6 ospf neighbor
- show ipv6 protocols
Explanation: No answer description available for this question
Q15. When checking a routing table, a network technician notices the following entry: OE2 0.0.0.0/0 [110/1] via 192.168.16.3, 00:20:22, Serial0/0/0 What information can be gathered from this output?
- The route is located two hops away.
- The metric for this route is 110.
- The edge of the OSPF area 0 is the interface that is addressed 192.168.16.3.
- This route is a propagated default route.
Explanation: The metric towards this external route is one and 192.168.16.3 is the address of the next interface towards the destination.
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Q18. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. Which routers are the DR and BDR in this topology?
- DR:R6 BDR:R5
- DR:R1 BDR:R2
- DR:R5 BDR:R3
- DR:R3 BDR:R6
- DR:R3 BDR:R5
- DR:R4 BDR:R1
Explanation: Once OSPF neighbor adjacencies have formed, use the show ip ospf neighbors command to determine which router was elected the DR and which router was elected the BDR. In this scenario, R3 was elected the DR because it had the highest priority (10). R5 was elected the BDR because it had the highest router ID among eligible routers (5.5.5.5). R6 was not eligible to become the BDR because its priority was set to 0.
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Explanation: No answer description available for this question
Q20. Which command will a network engineer issue to verify the configured hello and dead timer intervals on a point-to-point WAN link between two routers that are running OSPFv2?
- show ipv6 ospf interface serial 0/0/0
- show ip ospf neighbor
- show ip ospf interface fastethernet 0/1
- show ip ospf interface serial 0/0/0
Explanation: The show ip ospf interface serial 0/0/0 command will display the configured hello and dead timer intervals on a point-to-point serial WAN link between two OSPFv2 routers. The show ipv6 ospf interface serial 0/0/0 command will display the configured hello and dead timer intervals on a point-to-point serial link between two OSPFv3 routers. The show ip ospf interface fastethernet 0/1 command will display the configured hello and dead timer intervals on a multiaccess link between two (or more) OSPFv2 routers. The show ip ospf neighbor command will display the dead interval elapsed time since the last hello message was received, but does not show the configured value of the timer.
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Explanation: No answer description available for this question
Q22. Which OSPF feature allows a remote OSPF area to participate in OSPF routing when it cannot connect directly to OSPF Area 0?
- virtual link
- NBMA
- point-to-point connectivity
- DR/BDR
Explanation: No answer description available for this question
Q23. A network engineer suspects that OSPFv3 routers are not forming neighbor adjacencies because there are interface timer mismatches. Which two commands can be issued on the interface of each OSFPv3 router to resolve all timer mismatches? (Choose two.)
- no ipv6 ospf dead-interval
- ip ospf hello-interval 10
- no ipv6 router ospf 10
- no ipv6 ospf cost 10
- no ipv6 ospf hello-interval
- ip ospf dead-interval 40
Explanation: The no ipv6 ospf hello-interval and no ipv6 ospf dead-interval commands issued on each OSPFv3 interface will reset the intervals to the respective default periods. This ensures that the timers on all routers now match and, providing other appropriate configurations are correct, the routers will form adjacencies. The ip ospf hello-interval 10 and ip ospf dead-interval 40 commands are OPSFv2 commands that are used for IPv4 routing. If the ipv6 ospf hello-interval and ipv6 ospf dead-interval commands are used, then the interval has to be specified in seconds. The parameter default is not valid in these commands.
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