OSPF Chapter 1 QUIZ

Select the command that 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?[CLO 1]

• show ip ospf neighbor

• show ip ospf interface serial 0/0/0

• show ipv6 ospf interface serial 0/0/0

• show ip ospf interface fastethernet 0/1

Identify OSPF serial interfaces that usually require manual bandwidth configuration.[CLO 1]

• OSPF uses the bandwidth value to compute routes for its routing table.

• Each side of an OSPF serial link should be configured with a unique value.

• All serial interfaces default to a value of 1.544 Mb/s.

• Bandwidth value affects the actual speed of the link.

Why MD5 authentication more secure than simple authentication for OSPF updates?[CLO 1]

• MD5 does not send the password to the neighbor router.

• MD5 requires passwords that are at least 8 characters long.

• MD5 uses both a username and a password to authenticate the neighbor.

• MD5 employs IPsec to keep the updates from being intercepted.

When OSPFv2 neighbors are establishing adjacencies, in which state do they elect a DR and BDR router?[CLO 1]

• Exchange state

• Init state

• Two-Way state

• Loading state

Identify the recommended method of authentication for OSPFv3.[CLO 1]

• MD5 authentication

• IPsec to secure routing updates

• the passive-interface command

• a VPN tunnel between each OSPF neighbor adjacency

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?[CLO 2]

• Configure the network statements.

• Change the interface priority.

• Change the OSPFv2 process ID

• Issue the clear ip ospf process privileged mode command.

Refer to the exhibit 1. What kind of OSPF authentication has been configured on this interface?[CLO 2]

• simple

• null

• plain text

• MD5

A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router loses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?[CLO 2]

• All routes for the entire network will be present.

• Directly connected networks that are operational will be in the routing table.

• Because the SPF algorithm has not completed all calculations, no routes will be in the table.

• A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.

Refer to the exhibit 2. Four routers are connected to an Ethernet LAN segment and are configured to run OSPFv3. However, none of the routers are receiving routing updates. What is the cause of the problem?[CLO 2]

• The routers are using IPv4 addresses for router IDs.

• All of the routers have an OSPFv3 interface priority of 0.

• The network type has been set to BROADCAST instead of NBMA.

• The routers are using IPv6 link local addresses to communicate.

Refer to the exhibit 3. A network administrator has configured the OSPF timers to the values that are shown in the graphic. Identify the result of having those manually configured timers.[CLO 2]

• The R1 dead timer expires between hello packets from R2.

• R1 automatically adjusts its own timers to match the R2 timers.

• The hello timer on R2 expires every ten seconds.

• The neighbor adjacency has formed.