ICT Module 1 - Module Quiz - Single-Area OSPFv2 Concepts

What is used to create the OSPF neighbor table?

adjacency database

Which of the following OSPF components is responsible for computing the cost of each route?

Dijkstra's algorithm

Which of the following OSPF components is associated with the topology table?

Link-State database

Which of the following OSPF components is associated with the routing table?

Forwarding database

What is the correct order in the steps for Link-State operation?

1. Establish Neighbor Adjacencies
2. Exchange Link-State Advertisements
3. Build the Topology Table
4. Execute the SPF Algorithm
5. Choose the Best Route

Which of the following OSPF packets contains an abbreviated list of the LSDB of the sending router?

Type 2: DBD packet

Which of the following OSPF packets is used by routers to announce new information?

Type 4: LSU packet

Which of the following OSPF packets is used by routers to request more information?

Type 3: LSR packet

Which of the following OSPF packets is responsible for establishing and maintaining adjacency with other OSPF routers?

Type 1: Hello packet

Which of the following OSPF packets is used to confirm receipt of an LSA?

Type 5: LSAck packet

Which of the following is used with the Hello Packet to uniquely identify the originating router?

Router ID

During this OSPF state on multiaccess networks, the routers elect a Designated Router (DR) and a Backup Designated Router (BDR).

Two-Way State

During this OSPF state, routers send each other DBD packets.

Exchange State

An OSPF router enters this state when it has received a Hello packet from a neighbor, containing the sending Router ID.

Init State

During this OSPF state on point-to-point networks, the routers decide which router initiates the exchange of DBD packets.

ExStart State

During this OSPF state, routers have converged link-state databases.

Full State

What is a function of OSPF hello packets?

to discover neighbors and build adjacencies between them

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

LSU

Which statements describe features of the OSPF topology table?

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

Which statements does not describe features of the OSPF topology table?

Its contents are the result of running the SPF algorithm.

What does an OSPF area contain?

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

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.

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

Hello, DBD, LSR, LSU, LSAck

What is a feature of the OSPF routing protocol?​

It scales well in both small and large networks.

Which of the following OSPF components is associated with the neighbor table?

Adjacency database

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

link-state database

What function is performed by the OSPF designated router?

dissemination of LSAs

What reasons for creating an OSPF network with multiple areas?

to reduce use of memory and processor resources

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

Full

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

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

They exchange abbreviated lists of their LSDBs.

Which statement is correct about multiarea OSPF?

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

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

Link-state database

What is the purpose of an OSPF router ID?

To uniquely identify the router within the OSPF domain and facilitate router participation in elections

Which statement describes a multiarea OSPF network?

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

What is an advantage of using multiarea OSPF?

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

Which command can be used to verify the contents of the LSDB in an OSPF area?

show ip ospf database

Which of the following facilitates hierarchical routing in OSPF?

The use of multiple areas

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

Executes the SPF algorithm

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

The following OSPF states are performed prior to two routers forming a neighbor adjacency, except:

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

When the routers are interconnected over a common Ethernet network

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

Every 30 minutes