B mod 1/2 single area OSPFv2 concepts/configuration

What is the order of packet types used by an OSPF router to establish convergence

Hello, DBD, LSR, LSU, LSAck

Refer to the exhibit. Suppose that routers B, C, and D have a default priority, and router A has a priority 0. Which conclusion can be drawn from the DR/BDR election process

If the DR fails, the new DR will be router B.

Which three statements describe features of the OSPF topology table? (Choose three.)

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 is a feature of the OSPF routing protocol

It scales well in both small and large networks

In an OSPFv2 configuration, what is the effect of entering the command network 192.168.1.1 0.0.0.0 area 0

It tells the router which interface to turn on for the OSPF routing process.

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

LSU

A network technician issues the following commands when configuring a router

OSPF process ID on R1

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 remove that neighbor from the router link-state database.

Refer to the exhibit. On which router or routers would a default route be statically configured in a corporate environment that uses single area OSPF as the routing protocol

R0-A

Refer to the exhibit. Which command did an administrator issue to produce this output

R1# show ip ospf interface serial0/0/1

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?

The R1 dead timer expires between hello packets from R2.

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

They exchange abbreviated lists of their LSDBs.

What is a benefit of multiarea OSPF routing

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

What is used to create the OSPF neighbor table?

adjacency database

What function is performed by the OSPF designated router

dissemination of LSAs

What type of address is 64.101.198.197

public

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 serial 0/0/0

What is a function of OSPF hello packets?

to discover neighbors and build adjacencies between them

In an OSPF network when are DR and BDR elections required

when the routers are interconnected over a common Ethernet network

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 64.102.0.0 255.255.255.128. What wildcard mask would the administrator use in the OSPF network statement

0.0.0.127

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.181.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement

0.0.1.255

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.223.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement

0.0.1.255

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 128.107.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement

0.0.3.255

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 198.19.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement

0.0.3.255

An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 128.107.0.0 255.255.255.192. What wildcard mask would the administrator use in the OSPF network statement

0.0063

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

1

What is the default router priority value for all Cisco OSPF routers

1

Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID

192.168.1.100

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?

60 seconds

Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/24 from B

65

Which statement is correct about multiarea OSPF?

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

What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues

Configure a value using the router-id command.

When an OSPF network is converged and no network topology change has been detected by a router, how often will LSU packets be sent to neighboring routers

Every 30 minutes

Which three OSPF states are involved when two routers are forming an adjacency? (Choose three.)

Init Two-way Down

Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem

Interface Fa0/0 has not been activated for OSPFv2 on router R2.

What is the format of the router ID on an OSPF-enabled router

a 32-bit number formatted like an IPv4 address

Match the description to the term. (Not all options are used.)

adjacency database => This is where the details of the neighboring routers can be found. Shortest Path First => This is the algorithm used by OSPF. Single-area OSPF => All the routers are in the backbone area. - not scored - link-state database => This is where you can find the topology table. - not scored -

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

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

Which step in the link-state routing process is described by a router building a link-state database based on received LSAs

building the topology table

Which step in the link-state routing process is described by a router inserting best paths into the routing table?

choosing the best route

Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to check against the local LSDB

database description

To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which two values in the hello packets must match on both routers? (Choose two.)

dead interval hello interval

Which step in the link-state routing process is described by a router sending Hello packets out all of the OSPF-enabled interfaces?

establishing neighbor adjacencies

Which step in the link-state routing process is described by a router flooding link-state and cost information about each directly connected link?

exchanging link-state advertisements

Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination

executing the SPF algorithm

At which OSPF state are neighbor routers converged and able to exchange routing updates?

full

What indicates to a link-state router that a neighbor is unreachable

if the router no longer receives hello packets

What is identical on all OSPF routers within a single area

link-state database

An OSPF router has three directly connected networks; 172.16.0.0/16, 172.16.1.0/16, and 172.16.2.0/16. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors?

router(config-router)# network 172.16.1.0 0.0.255.255 area 0

What does an OSPF area contain?

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

What command would be used to determine if a routing protocol-initiated relationship had been made with an adjacent router

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 protocols

What is the reason for a network engineer to alter the default reference bandwidth parameter when configuring OSPF

to more accurately reflect the cost of links greater than 100 Mb/s

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

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

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

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