Cisco Network Administration -Scaling Networks - Chapter 8, 9, & 10

This loopback interface may be advertised as a reachable network.

A network administrator configures a loopback interface as the OSPF router ID with the IP address of 192.168.1.1/30. What could be the consequence of using this 30-bit mask for the loopback interface?

The OSPFv3 process will be assigned an ID of 64.

A network administrator enters the command ipv6 router ospf 64 in global configuration mode. What is the result of this command?

show ipv6 ospf neighbor

A network administrator is troubleshooting an OSPFv3 configuration on an IPv6 network. Which command can the administrator use to check if an adjacency is successfully formed?

O IA

A network administrator is verifying a multi-area OSPF configuration by checking the routing table on a router in area 1. The administrator notices a route to a network that is connected to a router in area 2. Which code appears in front of this route in the routing table within area 1?

the OSPF process ID on R1

A network technician issues the following commands when configuring a router: R1(config)# router ospf 11 R1(config-router)# network 10.10.10.0 0.0.0.255 area 0 What does the number 11 represent?

4

A type_____________________________ LSA identifies the ASBR and provides a route to it.

link

A virtual ______________________ is a special OSPF transit area that is used to connect a remote OSPF network to Area 0.

LSA type 4

An ABR in a multiarea OSPF network receives LSAs from its neighbor that identify the neighbor as an ASBR with learned external networks from the Internet. Which LSA type would the ABR send to other areas to identify the ASBR, so that internal traffic that is destined for the Internet will be sent through the ASBR?

5

An ASBR generates type _______________________ LSAs for each of its external routes and floods them into the area that it is connected to.

IA

An OSPF router has received type 3 summary LSAs that were flooded into an area. How are these LSAs identified in the routing table?

true

An administrator can use the show ipv6 protocols command to verify router interfaces that are enabled for OSPFv3.

1

By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater?

Loopback interface IP address 172.16.1.1

By order of precedence, match the selection of router ID for an OSPF-enable router to the possible router ID options. (Not all option are used.) Third precedence

Configured router ID 1.1.1.1

By order of precedence, match the selection of router ID for an OSPF-enable router to the possible router ID options. (Not all option are used.) first precedence

Serial interface IP address 192.168.10.1

By order of precedence, match the selection of router ID for an OSPF-enable router to the possible router ID options. (Not all option are used.) fourth precedence

Loopback interface address 10.1.1.1

By order of precedence, match the selection of router ID for an OSPF-enable router to the possible router ID options. (Not all option are used.) second precedence

the highest IPv4 address on a loopback interface

If a specific router ID is not configured on an IPv4-based OSPF router, what will the IOS look for next to determine the router ID?

compare local topology to that sent by another router

Match each OSPF packet type to how it is used by a router. (Not all options are used.) database description packet

establish and maintain adjacencies

Match each OSPF packet type to how it is used by a router. (Not all options are used.) hello packet

advertise new information

Match each OSPF packet type to how it is used by a router. (Not all options are used.) link-state packet

query another router for additional information

Match each OSPF packet type to how it is used by a router. (Not all options are used.) link-state request packet

a router with its interfaces attached to multiple areas

Match each type of OSPF router to its description. (Not all options are used.) area border router

a router that has at least one interface that is attached to a non-OSPF network

Match each type of OSPF router to its description. (Not all options are used.) autonomous system boundary router

a router in the backbone area

Match each type of OSPF router to its description. (Not all options are used.) backbone router

a router with all its interfaces in the same area

Match each type of OSPF router to its description. (Not all options are used.) internal router

including a list of directly attached network prefixes and link typ

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 1

identifying the routers and the network address of the multi access link

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 2

advertising networks from other areas by ABRs

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 3

advertising an ASBR to other areas and providing route to it

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 4

advertising external (non-OSPF) network addresses

Match the OSPF LSA types to their descriptions. (Not all options are used.) LSA type 5

exchange state

Match the OSPF state with the order in which it occurs. (Not all options are used.) fifth state

down state

Match the OSPF state with the order in which it occurs. (Not all options are used.) first state

exstart state

Match the OSPF state with the order in which it occurs. (Not all options are used.) fourth state

init state

Match the OSPF state with the order in which it occurs. (Not all options are used.) second state

full state

Match the OSPF state with the order in which it occurs. (Not all options are used.) seventh state

loading state

Match the OSPF state with the order in which it occurs. (Not all options are used.) sixth state

two-way state

Match the OSPF state with the order in which it occurs. (Not all options are used.) third state

show interface s0/0/0

Match the information to the command that is used to obtain the information. (Not all options are used.) BW 1544 Kbit/sec

show ip ospf neighbor

Match the information to the command that is used to obtain the information. (Not all options are used.) Neighbor ID of 3.3.3.3

show ip ospf

Match the information to the command that is used to obtain the information. (Not all options are used.) Routing Process "ospf 10" with ID 1.1.1.1

show ip protocols

Match the information to the command that is used to obtain the information. (Not all options are used.) Routing Protocol is "ospf 10"

designated

OSPF type 2 LSA messages are only generated by the ____________________ router to advertise routes in multiaccess networks.

cost

OSPF uses ________ as a metric.

false

OSPFv3 is enabled on a router interface by using the network command in router configuration mode.

The routes are not enabled in the OSPF advertisement.

R1# show running-config ipc6 unicast-routing ! interafce g0/0 no ip address ipv6 address 2001:db8:cafe:a001::a/64 ! interface g0/1 no ip address ipv6 address 2001:db8:cafe:1::1/64 ! ipv6 router ospf 1 router-id 1.1.1.1 log-adjacency-changes ! Refer to the exhibit. Directly connected networks configured on router R1 are not being shared with neighboring routers through OSPFv3. What is the cause of the issue?

Use the router-id command with an IPv4-like address.

RT2# show ipv6 ospf %OSPFv3: Router process 1 INACTIVE, please configure a router-id Refer to the exhibit. A network administrator is configuring OSPFv3 on the router. The administrator issues the command show ipv6 ospf and an error message appears. What should the administrator do to start the OSPFv3 process?

10.0.0.0 255.255.240.0

Refer to the exhibit. A network administrator has been asked to summarize the networks shown in the exhibit as part of a multiarea OSPF implementation. All addresses are using a subnet mask of 255.255.255.0. What is the correct summarization for these eight networks? 10.0.4.0 10.0.5.0 10.0.6.0 10.0.7.0 10.0.8.0 10.0.9.0 10.0.10.0 10.0.11.0

ipv6 ospf 20 area 0

Single area OSPFv3 has been enabled on a router via the ipv6 router ospf 20 command. Which command will enable this OSPFv3 process on an interface of that router?

60 seconds

The OSPF hello timer has been set to 15 seconds on a router in a point-to-point network. By default, what is the dead interval on this router?

hello

The OSPF type 1 packet is the ______________ packet.

default-information originate

The _______________________________ command is used when configuring an OSPFv2 router to redistribute only a static default route.

network 192.168.10.128 0.0.0.127 area 1

The _________________________________ command must be issued to configure R1 for multiarea OSPF.

process

The command clear ip ospf _______________________ forces a router with a new or changed router ID to form new adjacencies.

multiaccess

The election of a DR and a BDR takes place on ___________________________ networks, such as Ethernet networks.

area 15 range 172.16.8.0 255.255.248.0

The network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are 172.16.8.0, 172.16.10.0, and 172.16.12.0 with subnet masks of 255.255.255.0 for each network. Which command should the administrator use to forward the summary route for area 15 into area 0?

0.0.15.255

The wildcard mask that is used to advertise exactly the network 192.168.160.0 with subnet mask 255.255.240.0 is __________________~

show ipv6 protocols

To quickly verify OSPFv3 configuration information including the OSPF process ID, the router ID, and the interfaces enabled for OSPFv3, you need to issue the command _______________________________________.

Full

To which state will OSPF routers transition to when they have converged?

type 2

What OSPF LSA type is used to inform routers of the router ID of the DR in each multiaccess network in an OSPF area?

to uniquely identify the router within the OSPF domain to facilitate router participation in the election of the designated router

What are the two purposes of an OSPF router ID? (Choose two.)

the router ID of the neighboring routers the OSPF state of each interface the IP address of the neighbor router interface to which this router is directly connected

What are three entries that are displayed by the show ip ospf neighbor command? (Choose three.)

to reduce SPF calculations to reduce use of memory and processor resources

What are two reasons for creating an OSPF network with multiple areas? (Choose two.)

mismatched OSPF Hello or Dead timers mismatched subnet masks on the link interfaces

What are two reasons that will prevent two routers from forming an OSPFv2 adjacency? (Choose two.)

an Ethernet interface MAC address available on the router, the FE80::/10 prefix, and the EUI-64 process

What does a Cisco router use automatically to create link-local addresses on serial interfaces when OSPFv3 is implemented?

They exchange abbreviated lists of their LSDBs.

What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency?

the route to reach an ASBR

What information is advertised in a type 4 LSA?

Topology changes in one area do not cause SPF recalculations in other areas.

What is a benefit of multiarea OSPF routing?

the route was learned from another area

What is indicated by the O IA in the router output?

adjacency database

What is used to create the OSPF neighbor table?

the use of multiple areas

What is used to facilitate hierarchical routing in OSPF?

Area 0

What must all non-backbone OSPF areas connect to when deploying multiarea OSPF?

O IA

What routing table descriptor is used to identify OSPF summary networks that originate from an ABR?

type 5

What type of OSPF LSA is originated by ASBR routers to advertise external routes?

any IP address that is configured using the router-id command

What will an OSPF router prefer to use first as a router ID?

ipv6 router ospf 10

When a network engineer is configuring OSPFv3 on a router, which command would the engineer issue immediately before configuring the router ID?

type 1

Which LSA type advertises directly connected OSPF-enabled links to other OSPF routers within the OSPF area they originated?

type 2

Which LSA type is flooded by a designated router to other OSPF routers within the same area?

LSU

Which OPSF packet contains the different types of link-state advertisements?

link-state database

Which OSPF component is identical in all routers in an OSPF area after convergence?

They are required to perform any summarization or redistribution tasks.

Which characteristic describes both ABRs and ASBRs that are implemented in a multiarea OSPF network?

show ip protocols

Which command should be used to check the OSPF process ID, the router ID, networks the router is advertising, the neighbors the router is receiving updates from, and the default administrative distance?

show ipv6 route ospf

Which command will provide information specific to OSPFv3 routes in the routing table?

show ipv6 route

Which command will verify that a router running OSPFv3 has received a redistributed default static route from another OSPFv3 router?

show ipv6 ospf neighbor

Which command will verify that a router that is running OSPFv3 has formed an adjacency with other routers in its OSPF area?

configuring mismatched MTU values on two adjacent routers

Which configuration will prevent two directly connected Cisco routers from forming an OSPFv2 neighbor adjacency?

show ip protocols

Which show command displays the administrative distance of the routing protocol that is being used?

Both OSPFv2 and OSPFv3 use multicast destination addresses for link-state packets

Which statement describes a difference or similarity between OSPFv2 and OSPFv3?

Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers

Which statement is correct about multiarea OSPF?

FE80::1 FF02::5 FF02::6

Which three addresses could be used as the destination address for OSPFv3 messages? (Choose three.)

they both are link-state protocols they both share the concept of multiple areas they both use the same DR/BDR election process

Which three statements describe the similarities between OSPFv2 and OSPFv3? (Choose three.)

Define the OSPF parameters. Gather the required parameters. Define the network requirements.

Which three steps in the design and implementation of a multiarea OSPF network are considered planning steps? (Choose three.)

192.168.33.0/24 192.168.35.0/24

Which two networks are part of the summary route 192.168.32.0/22? (Choose two.)

type 3 LSAs are generated without requiring a full SPF calculation Type 3 LSAs are used to update routes between OSPF areas

Which two statements correctly describe OSPF type 3 LSAs? (Choose two.)

OSPF routers within an area have the same link-state information. OSPF routers may have large routing tables if routes are not summarized.

Which two statements describe OSPF? (Choose two.)

type 1 type 2

Which two types of LSAs are flooded only within the area in which they originated? (Choose two.)

IA E2

Which type of routing table entry would indicate that an external route was redistributed into the multiarea OSPF process?

The routing table contains routes from multiple areas. To reach network 192.168.1.0, traffic will exit via the Serial0/0/0 interface

branch1# sho ip route <output omitted> 172.16.0.0/16 is variabley subnetted, 6 subnets, 3 masks C 172.16.1.0/24 is directly connected, g0/0 L 172.16.1.1/32 is directly connected, g0/0 0 172.16.2.0/24 [110/65] via 172.16.200.2, 00:09:38, s0/0/0 C 172.16.200.0/24 is directly connected, s0/0/0 L 172.16.200.1/32 is directly connected, s0/0/0 0 IA 172.16.200.4/30 [110/128] via 172.16.200.2, 00:07:27, s0/0/0 0 IA 192.168.1.0/24 [110/129] via 172.16.200.2, 00:06:37, s0/0/0 Refer to the exhibit. Which two statements are correct? (Choose two.)

R1(config)# interface GigabitEthernet 0/0 R1(config-if)# ipv6 ospf 3 area 1

r1(config)# int g0/0 r1(config-if)# ipv6 address 2001:db8:acad:a::1/64 r1(config-if)# no shutdown r1(config-if)# exit r1(config)# ipv6 unicast-routing r1(config)# ipv6 router ospf 3 r1(config-router)# router-id 1.1.1.1 r1(config-router)#exit Refer to the exhibit. A network administrator is configuring OSPFv3 on R1. Which command sequence is used to advertise the network that is attached to Gi0/0?

R1 is an ABR

r1(config)# router ospf 3 r1(config-router)# router-id 1.1.1.1 r1(config-router)# network 172.16.1.64 0.0.0.63 area 1 r1(config-router)# network 172.16.1.192 0.0.0.63 area 1 r1(config-router)# network 192.168.10.0 0.0.0.7 area 0 r1(config-router)#end Refer to the exhibit. A network administrator is configuring OSPFv2 on R1. Which conclusion can be drawn based on the configuration?