NET-225-CHAPTER 1

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 of the following OSPF components is associated with the neighbor table? Dijkstra's algorithm Link-State database Routing protocol messages Adjacency database Forwarding database

Adjacency database

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.

Which of the following OSPF components is responsible for computing the cost of each route? Dijkstra's algorithm Link-State database Routing protocol messages Adjacency database Forwarding database

Dijkstra's algorithm

During this OSPF state, no Hello packets are received. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Down State

What is the correct order in the steps for Link-State operation? You got it! Execute the SPF Algorithm Establish Neighbor Adjacencies Exchange Link-State Advertisements Choose the Best Route Build the Topology Table Establish Neighbor Adjacencies Choose the Best Route Build the Topology Table Execute the SPF Algorithm Exchange Link-State Advertisements Establish Neighbor Adjacencies Exchange Link-State Advertisements Execute the SPF Algorithm Choose the Best Route Build the Topology Table Establish Neighbor Adjacencies Exchange Link-State Advertisements Build the Topology Table Execute the SPF Algorithm Choose the Best Route

Establish Neighbor Adjacencies Exchange Link-State Advertisements Build the Topology Table Execute the SPF Algorithm Choose the Best Route

During this OSPF state on point-to-point networks, the routers decide which router initiates the exchange of DBD packets. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

ExStart State

During this OSPF state, routers send each other DBD packets. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Exchange State

Which of the following OSPF components is associated with the routing table? Dijkstra's algorithm Link-State database Routing protocol messages Adjacency database Forwarding database

Forwarding database

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

Full

During this OSPF state, routers have converged link-state databases. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Full State

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

An OSPF router enters this state when it has received a Hello packet from a neighbor, containing the sending Router ID. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Init State

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 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.

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

LSU

Which of the following OSPF components is associated with the topology table? Dijkstra's algorithm Link-State database Routing protocol messages Adjacency database Forwarding database

Link-State database

During this OSPF state, routes are processed using the SPF algorithm. Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Loading State

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.

Which of the following is used with the Hello Packet to uniquely identify the originating router? Hello Interval Router ID Designated Router ID Network Mask Dead Interval

Router ID

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 their LSDBs.

During this OSPF state on multiaccess networks, the routers elect a Designated Router (DR) and a Backup Designated Router (BDR). Down State Init State Two-Way State ExStart State Exchange State Loading State Full State

Two-Way State

Which of the following OSPF packets is responsible for establishing and maintaining adjacency with other OSPF routers? Type 1: Hello packet Type 2: DBD packet Type 3: LSR packet Type 4: LSU packet Type 5: LSAck packet

Type 1: Hello packet

Which of the following OSPF packets contains an abbreviated list of the LSDB of the sending router? Type 1: Hello packet Type 2: DBD packet Type 3: LSR packet Type 4: LSU packet Type 5: LSAck packet

Type 2: DBD packet

Which of the following OSPF packets is used by routers to request more information? Type 1: Hello packet Type 2: DBD packet Type 3: LSR packet Type 4: LSU packet Type 5: LSAck packet

Type 3: LSR packet

Which of the following OSPF packets is used by routers to announce new information? Type 1: Hello packet Type 2: DBD packet Type 3: LSR packet Type 4: LSU packet Type 5: LSAck packet

Type 4: LSU packet

Which of the following OSPF packets is used to confirm receipt of an LSA? Type 1: Hello packet Type 2: DBD packet Type 3: LSR packet Type 4: LSU packet Type 5: LSAck packet

Type 5: LSAck packet

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

adjacency database

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

link-state database

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

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

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 use of memory and processor resources to reduce SPF calculations