Modules 1 - 2: OSPF

2. Which OPSF packet contains the different types of link-state advertisements? - hello - DBD - LSR - LSU - LSAck

LSU

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

Which command, if applied on an OSPF router, would give a Gigabit Ethernet interface a lower cost than a Fast Ethernet interface? - (config-if)# bandwidth 100 - (config-router)# auto-cost reference-bandwidth 1000 - (config-if)# ip ospf cost 100 - (config-if)# ip ospf priority 1

(config-router)# auto-cost reference-bandwidth 1000

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

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

What are two features of the OSPF routing protocol? (Choose two.) - automatically summarizes networks at the classful boundaries - has an administrative distance of 100 - calculates its metric using bandwidth - uses Dijkstra's algorithm to build the SPF tree - used primarily as an EGP

- calculates its metric using bandwidth - uses Dijkstra's algorithm to build the SPF tree

What are two reasons for creating an OSPF network with multiple areas? (Choose two.) - to provide areas in the network for routers that are not running OSPF - to ensure that an area is used to connect the network to the Internet - to reduce SPF calculations - to reduce use of memory and processor resources - to simplify configuration

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

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

0.0.0.31

A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID? - the IP address of the interface that is configured with priority 0 - the OSPF area ID that is configured on the interface with the highest IP address - the loopback interface IP address - the highest IP address on the LAN interfaces - the highest IP address that is configured on the WAN interfaces

the loopback interface IP address

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

the router-id rid command

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

to discover neighbors and build adjacencies between them

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? - 15 seconds - 30 seconds - 45 seconds - 60 seconds

60 seconds

Which statement is correct about multiarea OSPF? - OSPF can consolidate a fragmented OSPF area into one large area. - All routers are in one area called the backbone area (area 0). - Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers. - OSPF multiarea increases the frequency of SPF calculation.

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

At which OSPF state are neighbor routers converged and able to exchange routing updates? - Two-Way - ExStart - Exchange - Full

Full

What is the order of packet types used by an OSPF router to establish convergence? - Hello, LSAck, LSU, LSR, DBD - LSAck, Hello, DBD, LSU, LSR - Hello, DBD, LSR, LSU, LSAck - LSU, LSAck, Hello, DBD, LSR

Hello, DBD, LSR, LSU, LSAck

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. - Issue the clear ip ospf process privileged mode command. - Change the OSPFv2 process ID.

Issue the clear ip ospf process privileged mode command.

What is a feature of the OSPF routing protocol?​ - The SPF algorithm chooses the best path based on 30-second updates​. - OSPF authentication is configured in the same way on IPv4 and IPv6 networks.​ - It scales well in both small and large networks. - Routers can be grouped into autonomous systems to support a hierarchical system.

It scales well in both small and large networks.

A router is participating in an OSPFv2 domain. What will always happen if the dead interval expires before the router receives a hello packet from an adjacent DROTHER OSPF router? - OSPF will run a new DR/BDR election. - SPF will run and determine which neighbor router is "down". - A new dead interval timer of 4 times the hello interval will start. - OSPF will remove that neighbor from the router link-state database.

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

What does the SPF algorithm consider to be the best path to a network? - The path with the least number of hops. - The path with the smallest delays. - The path that includes the fastest cumulative bandwidth links. - The path that includes the fastest single bandwidth link.

The path that includes the fastest cumulative bandwidth links.

What is one use of the router ID in OSPF routing? - The router ID indicates the router priority value. - The router ID identifies the OSPF area. - The router ID can be used to break a tie in the election process. - The router ID indicates the highest IPv4 address of all routers that are participating in OSPF routing.

The router ID can be used to break a tie in the election process.

What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency? - They exchange DBD packets in order to advertise parameters such as hello and dead intervals. - They negotiate the election process if they are on a multiaccess network. - They request more information about their databases. - They exchange abbreviated lists of their LSDBs.

They exchange abbreviated lists of ther LSDBs.

What is used to create the OSPF neighbor table? - adjacency database - link-state database - forwarding database - routing table

adjacency database

A router in an OSPF enterprise network has a default static route that has been configured via the interface that connects to the ISP. Which command would the network administrator apply on this router so that other routers in the OSPF network will use this default route? - redistribute static - redistribute connected - redistribute static subnets - default-information originate

default-information originate

What function is performed by the OSPF designated router? - redistribution of external routes into OSPF - dissemination of LSAs - maintaining the link-state database - summarizing routes between areas

dissemination of LSAs

What is the first criterion used by OPSF routers to elect a DR? - highest priority - highest IP address - highest router ID - highest MAC address

highest priority

What is identical on all OSPF routers within a single area? - routing table - link-state database - neighbor table - static routes

link-state database

The following three networks are directly connected to an OSPF router; 192.168.0.0/24, 192.168.1.0/24, and 192.168.2.0/24. Which OSPF network command would advertise only the 192.168.1.0 network to neighbors? - router(config-router)# network 192.168.1.0 0.0.0.255 area 0 - router(config-router)# network 192.168.0.0 0.0.15.255 area 0 - router(config-router)# network 192.168.1.0 255.255.255.255 area 0 - router(config-router)# network 192.168.1.0 0.0.0.0 area 0

router(config-router)# network 192.168.1.0 0.0.0.255 area 0

What does an OSPF area contain? - routers that share the same router ID - routers whose SPF trees are identical - routers that have the same link-state information in their LSDBs - routers that share the same process ID

routers that have the same link-state information in their LSDBs

Which command can be used to view the OSPF hello and dead time intervals? - show ip protocols - show ip ospf neighbor - show ip ospf interface - show ip ospf route

show ip ospf interface

Which command could be used on a router to ensure that an OSPF adjacency is formed with another router? - show ip route - show ip protocols - show ip ospf interface - show ip ospf neighbor - show ip interface brief

show ip ospf neighbor

Which verification command would identify the specific interfaces on a router that were configured with the passive-interface command? - show ip eigrp neighbors - show ip protocols - show ip interface brief - show ip route eigrp

show ip protocols