ccna 3 chapter 5

Refer to the exhibit. Fill in the blank. Use a number. The process ID that is used for OSPFv3 on the router R1 is _____

10

Refer to the exhibit. 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? -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. -The routers are using IPv4 addresses for router IDs.

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

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:R1 BDR:R2 DR:R6 BDR:R5 DR:R5 BDR:R3 DR:R3 BDR:R6 DR:R4 BDR:R1 DR:R3 BDR:R5

DR:R3 BDR:R5

Match the OSPF adjacency function with the correct state. (Not all options are used.) -Routers exchange DBD packets. Two-Way state Exchange state Init state

Exchange state

Match the OSPF adjacency function with the correct state. (Not all options are used.) -Routers receive hello packets that contain the router ID of the neighboring device. Two-Way state Exchange state Init state

Init state

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? -Configure the network statements. -Change the interface priority. -Change the OSPFv2 process ID. -Issue the clear ip ospf process privileged mode command

Issue the clear ip ospf process privileged mode command.

Consider the R1(config-if)# ip ospf message-digest-key 1 md5 CISCO-123 command. What is the function of the CISCO-123 portion of the command? -It is used as a password. -It is used as the key index. -It is used to choose the type of authentication. -It is used to name the OSPFv2 process.

It is used as a password

What statement describes the reference bandwidth in OSPFv3? -It prevents the router from automatically adjusting the bandwidth. -It increases the speed of the link to accommodate increasing demands for bandwidth. -It should be changed if links faster than 100 Mb/s exist in the OSPF network. -It is set to 1 Gb/s by default.

It should be changed if links faster than 100 Mb/s exist in the OSPF network.

Refer to the exhibit. What kind of OSPF authentication has been configured on this interface? plain text null simple MD5

MD5

Why is MD5 authentication more secure than simple authentication for OSPF updates? -MD5 employs IPsec to keep the updates from being intercepted. -MD5 does not send the password to the neighbor router. -MD5 uses both a username and a password to authenticate the neighbor. -MD5 requires passwords that are at least 8 characters long.

MD5 does not send the password to the neighbor router.

Refer to the exhibit. An administrator is trying to configure R1 to run OSPFv3 but the neighbor adjacency is not forming with the router connected to Fa0/0. What is the cause of the problem? -A link-local address has not been configured on interface FastEthernet0/0. -No router ID has been configured. -FastEthernet0/0 has been configured as a passive interface. -The OSPF process ID and area values are backwards in the interface configuration.

No router ID has been configured.

Which two pieces of information are used by the OSPF MD5 algorithm to generate a signature? (Choose two.) interface IP address OSPF router ID OSPF message secret key router hostname

OSPF message secret key

Why do OSPF serial interfaces usually require manual bandwidth configuration? -OSPF uses the bandwidth value to compute routes for its routing table. -All serial interfaces default to a value of 1.544 Mb/s. -Bandwidth value affects the actual speed of the link. -Each side of an OSPF serial link should be configured with a unique value

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

Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2? (Choose three.) router ID OSPFv2 process number OSPFv2 type of network hello timer interface priority subnet mask

OSPFv2 type of network hello timer subnet mask

Refer to the exhibit. Which command did an administrator issue to produce this output? R1# show ip ospf R1# show ip ospf neighbor R1# show ip ospf interface serial0/0/1 R1# show ip route ospf

R1# show ip ospf interface serial0/0/1

Refer to the exhibit. These four routers are connected together on the same LAN segment. Based on the output shown, which of these routers will be elected to be the DR for the segment? R1 R2 R3 R4

R2

Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers? -R1 automatically adjusts its own timers to match the R2 timers. -The neighbor adjacency has formed. -The hello timer on R2 expires every ten seconds. -The R1 dead timer expires between hello packets from R2

The R1 dead timer expires between hello packets from R2.

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 15 seconds. -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 60 seconds.

Refer to the exhibit. These two routers are configured to run OSPFv3 but they are not forming a neighbor adjacency. What is the cause of the problem? -The routers have both been elected as the DR. -The routers do not have global IPv6 addresses that are configured on the Fa0/0 interfaces. -The routers are configured with the same router ID. -The routers have the same priority.

The routers are configured with the same router ID

Refer to the exhibit. 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 IPv6 addresses of R1 and R2 are not in the same subnet. -The OSPFv3 process IDs of R1 and R2 are different. -The timer intervals of R1 and R2 do not match. -The priority value of both R1 and R2 is 1.

The timer intervals of R1 and R2 do not match.

Refer to the exhibit. What three conclusions can be drawn from the displayed output? (Choose three.) -This interface is using the default priority. -The router ID values were not the criteria used to select the DR and the BDR. -The DR can be reached through the GigabitEthernet 0/0 interface. -The router ID on the DR router is 3.3.3.3 -The BDR has three neighbors. -There have been 9 seconds since the last hello packet sent.

There have been 9 seconds since the last hello packet sent. The router ID values were not the criteria used to select the DR and the BDR The DR can be reached through the GigabitEthernet 0/0 interface

Refer to the exhibit. R1 and R3 are connected to each other via the local serial 0/0/0 interface. Why are they not forming an adjacency? -They are in different subnets. -They have different routing processes. -They have different router IDs. -The connecting interfaces are configured as passive.

They are in different subnets.

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. -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.

Match the OSPF adjacency function with the correct state. (Not all options are used.) -On Ethernet links, a designated router (DR) and a backup designated router (BDR) is elected. Two-Way state Exchange state Init state

Two-Way state

When OSPFv2 neighbors are establishing adjacencies, in which state do they elect a DR and BDR router? Exchange state Two-Way state Loading state Init state

Two-Way state

A network engineer is troubleshooting OSPFv2 routing issues on two connected routers. Which two requirements to form an adjacency need to be verified? (Choose two.) -Verify that one of the routers is the DR or BDR and the other router a DRother. -Verify that one of the interfaces that connects the two routers is active and the other passive. -Verify that the interfaces that connect the two routers are in the same area. -Verify that both routers are using the same OSPFv2 process ID. -Verify that the interfaces that connect the two routers are in the same subnet.

Verify that the interfaces that connect the two routers are in the same subnet. Verify that the interfaces that connect the two routers are in the same area.

Fill in the blank. Do not use abbreviations. The _____ command is used when configuring an OSPFv2 router to redistribute only a static default route.

default-information originate

A network engineer is troubleshooting an OSPFv2 network and discovers that two routers connected by a point-to-point WAN serial link are not establishing an adjacency. The OSPF routing process, network commands and area ID are all confirmed as correct, and the interfaces are not passive. Testing shows that the cabling is correct, that the link is up, and pings between the interfaces are successful. What is most likely the problem? -The OSPFv2 process IDs on each router do not match. -A clock rate has not been set on the DCE interface of the serial link. -The subnet masks on the two connected serial interfaces do not match. -A DR election has not taken place.

he subnet masks on the two connected serial interfaces do not match.

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.) -ip ospf hello-interval 10 -no ipv6 ospf hello-interval -no ipv6 router ospf 10 -no ipv6 ospf dead-interval -ip ospf dead-interval 40 -no ipv6 ospf cost 10

no ipv6 ospf hello-interval no ipv6 ospf dead-interval

A network engineer is troubleshooting convergence and adjacency issues in an OSPFv2 network and has noted that some expected network route entries are not displayed in the routing table. Which two commands will provide additional information about the state of router adjacencies, timer intervals, and the area ID? (Choose two.) show ip protocols show ip route ospf show running-configuration show ip ospf interface show ip ospf neighbor

show ip ospf interface show ip ospf neighbor

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 fastethernet 0/1 -show ip ospf interface serial 0/0/0 -show ip ospf neighbor -show ipv6 ospf interface serial 0/0/0

show ip ospf interface serial 0/0/0

Fill in the blank. Do not use abbreviations. When IPv4 and OSPFv2 are being used, the command _____ is used to verify that a router has formed an adjacency with its neighboring routers.

show ip ospf neighbor

Which command is used to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network? show ip interface brief show ip route ospf show ip protocols show ip ospf interface

show ip protocols

Refer to the exhibit. Fill in the blank. Do not use abbreviations. The command _____ can be issued on router R2 to verify the propagation of a static default route from R1 to R2

show ipv6 route

Which command will verify that a router running OSPFv3 has received a redistributed default static route from another OSPFv3 router? default-information originate redistribute static show ipv6 route show ip route

show ipv6 route

Refer to the exhibit. Fill in the blank. Do not use abbreviations. The command _____ is used to display only OSPFv3 learned routes.

show ipv6 route ospf

What is one reason to use the ip ospf priority command when the OSPF routing protocol is in use? -to activate the OSPF neighboring process -to influence the DR/BDR election process -to provide a backdoor for connectivity during the convergence process -to streamline and speed up the convergence process

to influence the DR/BDR election process