What function is performed by the OSPF designated router?

summarizing routes between areas

maintaining the link-state database

redistribution of external routes into OSPF

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

to reduce use of memory and processor resources

to ensure that an area is used to connect the network to the Internet

to provide areas in the network for routers that are not running OSPF

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

They exchange abbreviated lists of their LSDBs.

They negotiate the election process if they are on a multiaccess network.

They exchange DBD packets in order to advertise parameters such as hello and dead intervals.

They request more information about their databases.

Which statement is correct about multiarea OSPF?

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

OSPF can consolidate a fragmented OSPF area into one large area.

All routers are in one area called the backbone area (area 0).

OSPF multiarea increases the frequency of SPF calculation.

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

To facilitate router participation in the election of the designated router

To uniquely identify the router within the OSPF domain

To enable the SPF algorithm to determine the lowest-cost path to remote networks

To facilitate the establishment of network convergence

To facilitate the transition of the OSPF neighbor state to Full

Which statement describes a multiarea OSPF network?

It has a core backbone area with other areas connected to the backbone area.

It consists of multiple network areas that are daisy-chained together.

It has multiple routers that run multiple routing protocols simultaneously, and each protocol consists of an area.

It requires a three-layer hierarchical network design approach.

What are the advantages of using multiarea OSPF? (Choose two.)

It improves routing efficiency by reducing the routing table and linkstate update overhead.

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

A backbone area is not required.

It enables multiple routing protocols to run in a large network.

It improves routing performance by dividing the neighbor table into separate smaller ones.

Which of the following facilitates hierarchical routing in OSPF?

3. The election of designated routers

Which step does an OSPF-enabled router take immediately after the OSPF router builds the topology table?

Establishes an adjacency with another router

Exchanges link-state advertisements

.In an OSPF network, when are DR and BDR elections required?

When the routers are interconnected over a common Ethernet network

When all the routers in an OSPF area cannot form adjacencies

When the two adjacent neighbors are in two different networks

When the two adjacent neighbors are interconnected over a pointtopoint link

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 OSPF-enabled interface

the IP address of the highest active interface on the router

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 192.168.1.0 0.0.0.0 area 0

router(config-router)# network 192.168.1.0 255.255.255.255 area 0

router(config-router)# network 192.168.0.0 0.0.15.255 area 0

What are two features of the OSPF routing protocol? (Choose two.)

uses Dijkstra’s algorithm to build the SPF tree

calculates its metric using bandwidth

has an administrative distance of 100

automatically summarizes networks at the classful boundaries

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 loopback interface IP address

the highest IP address on the LAN interfaces

the OSPF area ID that is configured on the interface with the highest IP address

the IP address of the interface that is configured with priority 0

the highest IP address that is configured on the WAN interfaces

Which command, if applied on an OSPF router, would give a Gigabit Ethernet interface a lower cost than a Fast Ethernet interface?

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

(config-if)# ip ospf priority 1

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?

Issue the clear ip ospf process privileged mode command.

Configure the network statements.

What does the SPF algorithm consider to be the best path to a network?

The path that includes the fastest cumulative bandwidth links.

The path with the least number of hops.

The path with the smallest delays.

The path that includes the fastest single bandwidth link.

What is one use of the router ID in OSPF routing?

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 identifies the OSPF area.

The router ID indicates the router priority value.

Which two commands will configure OSPFv2 MD5 authentication on a router interface? (Choose two.)

ip ospf authentication message-digest

ip ospf message-digest-key 1 md5 CISCO-ABC

area 0 authentication messagedigest

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

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

a loopback interface that is configured with the highest IP address on the router

the highest active interface IP that is configured on the router

the highest active interface that participates in the routing process because of a specifically configured network statement

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

the OSPF state of each interface

the router ID of the neighboring routers

the IP address of the neighbor router interface to which this router is directly connected

the OSPF process ID used to establish the adjacency

the route metric and neighbor next hop address

Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)

The R4 router ID is 172.16.1.1.

The router ID on R2 is the loopback interface.

A network engineer new to a company notices that a particular Layer 3 device participating in routing OSPF networks has an interface the engineer has not seen before in the output of the show ip ospf interface brief command. The interface is listed as VL0 and has a state of P2P with an OSPF neighbor. Which OSPF feature is the company using?

a summarization of OSPF virtual interfaces

What are the only two roles that permit an OSPF router to be configured for summarization? (Choose two.)

autonomous system boundary router

Networking 3 (SA1)

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Julyza Peña

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a function of OSPF hello packets?

to discover neighbors and build adjacencies between them

to ensure database synchronization between routers

to send specifically requested link-state records

to request specific link-state records from neighbor routers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

LSU

LSR

Hello

DBD

LSAck

MULTIPLE SELECT QUESTION

45 sec • 1 pt

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

After convergence, the table only contains the lowest cost route entries for all known networks.

When converged, all routers in an area have identical topology tables.

The table can be viewed via the show ip ospf database command.

Its contents are the result of running the SPF algorithm.

It is a link-state database that represents the network topology.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does an OSPF area contain?

routers that share the same process ID

routers that share the same router ID

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

routers whose SPF trees are identical

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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?

A new dead interval timer of 4 times the hello interval will start

SPF will run and determine which neighbor router is “down”.

OSPF will run a new DR/BDR election.

OSPF will remove that neighbor from the router linkstate database.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

LSAck, Hello, DBD, LSU, LSR

LSU, LSAck, Hello, DBD, LSR

Hello, DBD, LSR, LSU, LSAck

Hello, LSAck, LSU, LSR, DBD

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a feature of the OSPF routing protocol?

OSPF authentication is configured in the same way on IPv4 and IPv6 networks.

Routers can be grouped into autonomous systems to support a hierarchical system.

It scales well in both small and large networks.

The SPF algorithm chooses the best path based on 30-second updates.

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What is a function of OSPF hello packets?

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

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

What does an OSPF area contain?

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?

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

What is a feature of the OSPF routing protocol?

What is used to create the OSPF neighbor table?

What is identical on all OSPF routers within a single area?

What function is performed by the OSPF designated router?

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