Chapter 10 - OSPF Tuning and Troubleshooting
What the amount of time that has elapsed since the router received a hello packet?
4 seconds
Which routers are the DR and BDR in this topology?
DR:R3 BDR:R5
A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem?
Interface Fa0/0 has not been activated for OSPFv2 on router R2.
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.
What are three resulting DR and BDR elections for the given topology?
R2 is BDR for segment A. R1 is DR for segment A. R5 is BDR for segment B.
What two conclusions can be drawn based on the output of the show ipv6 route command?
Route 2001:DB8:CAFE:B001::/64 is a route advertised by an ABR. R2 receives default route information from another router.
A network administrator is configuring OSPF for R1 and R2, but the adjacency cannot be established. What is the cause of the issue?
The area ID is misconfigured.
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.
R1 and R2 are connected to the same LAN segment and are configured to run OSPFv3. They are not forming a neighbor adjacency. What is the cause of the problem?
The timer intervals of R1 and R2 do not match.
What three conclusions can be drawn from the displayed output? (Choose three.)
There have been 9 seconds since the last hello packet sent. The DR can be reached through the GigabitEthernet 0/0 interface. The router ID values were not the criteria used to select the DR and the BDR.
Directly connected networks configured on router R1 are not being shared with neighboring routers through OSPFv3. What is the cause of the issue?
There is a mismatch of OSPF process ID in commands.
When checking a routing table, a network technician notices the following entry: O*E2 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?
This route is a propagated default route.
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 10 command on the interface g0/2 of RT1.
Which conclusion can be drawn from this OSPF multiaccess network?
With an election of the DR, the number of adjacencies is reduced from 6 to 3.
What three states are transient OPSF neighbor states that indicate a stable adjacency is not yet formed between two routers?
exstart exchange loading
Which two parameters must match between neighboring OSPF routers in order to form an adjacency?
network types hello / dead timers
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?
no ipv6 ospf hello-interval no ipv6 ospf dead-interval
Which command can be used to view the OSPF hello and dead time intervals?
show ip ospf interface
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 ip ospf interface serial 0/0/0
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
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 OSPFv3 configuration information
Which OSPF feature allows a remote OSPF area to participate in OSPF routing when it cannot connect directly to OSPF Area 0?
virtual link
