CCNA Routing and Switching Essentials Chapter 8 - Single-Area OSPF

trustworthiness

Administrative distance (AD) is the __________ (or preference) of the route source.

show ipv6 protocols

Fill in the blank. Do not use abbreviations. 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

C. Link-state database (LSDB)

Match the following OSPF characteristics: This creates the topology table. A. Adjacency database B. Forwarding database C. Link-state database (LSDB)

A. Adjacency database

Match the following OSPF characteristics: This creates the neighbor table. A. Adjacency database B. Forwarding database C. Link-state database (LSDB)

B. Forwarding database

Match the following OSPF characteristics: This creates the routing table. A. Adjacency database B. Forwarding database C. Link-state database (LSDB)

110

OSPF has a default administrative distance of __________.

cost

OSPF uses __________ as a metric.

Message Digest 5 (MD5), password

OSPF uses __________ authentication. When enabled, OSPF routers only accept encrypted routing updates from peers with the same pre-shared __________.

multiaccess

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

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

What are the two purposes of an OSPF router ID? (Choose two.) A. to facilitate the transition of the OSPF neighbor state to Full B. to facilitate router participation in the election of the designated router C. to uniquely identify the router within the OSPF domain D. to enable the SPF algorithm to determine the lowest cost path to remote networks E. to facilitate the establishment of network convergence

A. to discover neighbors and build adjacencies between them

What is a function of OSPF hello packets? A. to discover neighbors and build adjacencies between them B. to request specific link-state records from neighbor routers C. to send specifically requested link-state records D. to ensure database synchronization between routers

D. LSU

Which OPSF packet contains the different types of link-state advertisements? A. DBD B. hello C. LSAck D. LSU E. LSR

B. link-state database

Which OSPF component is identical in all routers in an OSPF area after convergence? A. SPF tree B. link-state database C. adjacency database D. routing table

A. authentication

Which OSPFv3 function works differently from OSPFv2? A. authentication B. hello mechanism C. election process D. metric calculation E. OSPF packet types

D. show ipv6 route ospf

Which command will provide information specific to OSPFv3 routes in the routing table? A. show ip route ospf B. show ip route C. show ipv6 route D. show ipv6 route ospf

B. They both are link-state protocols. D. They both share the concept of multiple areas. E. They both use the same DR/BDR election process.

Which three statements describe the similarities between OSPFv2 and OSPFv3? (Choose three.) A. They both have unicast routing enabled by default. B. They both are link-state protocols. C. They both support IPsec for authentication. D. They both share the concept of multiple areas. E. They both use the same DR/BDR election process. F. They both use the exit interface address as the source address when sending OSPF messages.

D. 0.0.0.31

Which wildcard mask would be used to advertise the 192.168.5.96/27 network as part of an OSPF configuration? A. 255.255.255.224 B. 255.255.255.223 C. 0.0.0.32 D. 0.0.0.31

A. The router will be assigned a router ID of 64.

A network administrator enters the command ipv6 router ospf 64 in global configuration mode. What is the result of this command? A. The router will be assigned a router ID of 64. B. The reference bandwidth will be set to 64 Mb/s. C. The router will be assigned an autonomous system number of 64. D. The OSPFv3 process will be assigned an ID of 64.

C. OSPF will remove that neighbor from the router link-state database.

A router is participating in an OPSFv2 domain. What will always happen if the dead interval expires before the router receives a hello packet from an adjacent DROTHER OPSF router? A. OSPF will run a new DR/BDR election. B. A new dead interval timer of 4 times the hello interval will start. C. OSPF will remove that neighbor from the router link-state database. D. SPF will run and determine which neighbor router is "down".

Scalable

OSPF is __________, meaning it works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

efficient

OSPF is __________, meaning routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

classless

OSPF is __________; by design; therefore, it supports VLSM and CIDR. A. Classless B. Efficient C. Fast convergence D. Scalable E. Secure

C. 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? A. ipv6 ospf 20 area 20 B. ipv6 ospf 0 area 20 C. ipv6 ospf 20 area 0 D. ipv6 ospf 0 area 0

C. 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? A. the FE80::/10 prefix and the EUI-48 process B. the MAC address of the serial interface, the FE80::/10 prefix, and the EUI-64 process C. an Ethernet interface MAC address available on the router, the FE80::/10 prefix, and the EUI-64 process D. the highest MAC address available on the router, the FE80::/10 prefix, and the EUI-48 process

B. 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? A. interface serial 0/0/1 B. ipv6 router ospf 10 C. ipv6 ospf 10 area 0 D. clear ipv6 ospf process

C. 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? A. show ip ospf B. show ip ospf interface C. show ip protocols D. show ip ospf neighbor

C. 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? A. show ipv6 interface brief B. show ipv6 route ospf C. show ipv6 ospf neighbor D. show running-configuration

A. the router-id rid command

Which criterion is preferred by the router to choose a router ID? A. the router-id rid command B. the IP address of the highest active interface on the router C. the IP address of the highest configured loopback interface on the router D. the IP address of the highest active OSPF-enabled interface

B. It is a link-state database that represents the network topology. C. The table can be viewed via the show ip ospf database command. F. When converged, all routers in an area have identical topology tables.

Which three statements describe features of the OSPF topology table? (Choose three.) A. After convergence, the table only contains the lowest cost route entries for all known networks. B. It is a link-state database that represents the network topology. C. The table can be viewed via the show ip ospf database command. D. Its contents are the result of running the SPF algorithm. E. The topology table contains feasible successor routes. F. When converged, all routers in an area have identical topology tables.

Fast convergence

With __________, OSPF quickly propagates network changes.