CCNA 3 Chapter 5 V6.0 Answers

1. What is maintained within an EIGRP topology table?

the hop count to all networks

all routes received from neighbors

the state of all links on the network

the area ID of all neighbors


2. After a network topology change occurs, which distance vector routing protocol can send an update message directly to a single neighboring router without unnecessarily notifying other routers?







3. What is a disadvantage of deploying OSPF in a large single area routing environment?

OSPF uses multicast updates.

OSPF uses a metric of bandwidth and delay.

OSPF uses excessive LSP flooding.

OSPF uses a topology database of alternate routes.


4. In the context of routing protocols, what is a definition for time to convergence?

the amount of time a network administrator needs to configure a routing protocol in a small- to medium-sized network

the capability to transport data, video, and voice over the same media

the amount of time for the routing tables to achieve a consistent state after a topology change

a measure of protocol configuration complexity


5. Refer to the exhibit. OSPF is used in the network. Which path will be chosen by OSPF to send data packets from Net A to Net B?

Which path will be chosen by OSPF to send data packets from Net A to Net B?

R1, R2, R5, R7

R1, R3, R5, R7

R1, R3, R6, R7

R1, R4, R6, R7

R1, R3, R5, R6, R7


6. What is the first step taken by a newly configured OSPF router in the process of reaching a state of convergence?

It builds the topological database.

It exchanges hello messages with a neighboring router.

It learns about directly connected links in an active state.

It floods LSP packets to neighboring routers.


7. Which feature provides secure routing updates between RIPv2 neighbors?

unicast updates

adjacency table

routing protocol authentication

keepalive messages


8. Match the features of link-state routing protocols to their advantages and disadvantages. (Not all options are used.)

Match the features of link-state routing protocols to their advantages and disadvantages

- Advantage

event-driven updates

building a topological map

fast convergence


- Disadvantage

bandwidth consumption

memory usage

CPU processing time


9. Which routing protocol uses link-state information to build a map of the topology for computing the best path to each destination network?






10. Which statement is an incorrect description of the OSPF protocol?

OSPF has fast convergence.

When compared with distance vector routing protocols, OSPF utilizes less memory and less CPU processing power.

OSPF builds a topological map of the network.

Multiarea OSPF helps reduce the size of the link-state database.


11. Which routing protocol sends a routing update to neighboring routers every 30 seconds?






12. Which dynamic routing protocol was developed as an exterior gateway protocol to interconnect different Internet providers?






13. Which two routing protocols are classified as distance vector routing protocols? (Choose two.)







14. What happens when two link-state routers stop receiving hello packets from neighbors?

They consider the neighbor to be unreachable and the adjacency is broken.

They will flood their database tables to each other.

They create a default route to the adjacent router.

They continue to operate as normal and are able to exchange packets.


15. Which two components of an LSP enable an OSPF router to determine if the LSP that is received contains newer information than what is in the current OSPF router link-state database? (Choose two.)

aging information



sequence numbers



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

automatically summarizes networks at the classful boundaries

used primarily as an EGP

calculates its metric using bandwidth

uses Dijkstra’s algorithm to build the SPF tree

has an administrative distance of 100


17. An OSPF enabled router is processing learned routes to select best paths to reach a destination network. What is the OSPF algorithm evaluating as the metric?

The amount of packet delivery time and slowest bandwidth.

The amount of traffic and probability of failure of links.

The number of hops along the routing path.

The cumulative bandwidth that is used along the routing path.


18. A network administrator is researching routing protocols for implementation in a critical network infrastructure. Which protocol uses the DUAL algorithm to provide almost instantaneous convergence during a route failover?






19. Which two protocols are link-state routing protocols? (Choose two.)








20. Which two requirements are necessary before a router configured with a link-state routing protocol can build and send its link-state packets? (Choose two.)

The router has constructed an SPF tree.

The router has determined the costs associated with its active links.

The router has established its adjacencies.

The routing table has been refreshed.

The router has built its link-state database.


21. Which two events will trigger the sending of a link-state packet by a link-state routing protocol? (Choose two.)

a link to a neighbor router has become congested

the initial startup of the routing protocol process

the requirement to periodically flood link-state packets to all neighbors

a change in the topology

the router update timer expiring


22. Refer to the exhibit. A network administrator has configured RIPv2 in the given topology. Which path would a packet take to get from the LAN that is connected to R1 to the LAN that is connected to R7?

A network administrator has configured RIPv2 in the given topology






23. What is the difference between interior and exterior routing protocols?

Exterior routing protocols are used only by large ISPs. Interior routing protocols are used by small ISPs.

Exterior routing protocols are used to administer a single autonomous system. Interior routing protocols are used to administer several domains.

Interior routing protocols are used to route on the Internet. Exterior routing protocols are used inside organizations.

Interior routing protocols are used to communicate within a single autonomous system. Exterior routing protocols are used to communicate between multiple autonomous systems.


24. Which routing protocol is designed to use areas to scale large hierarchical networks?






25. What are two purposes of dynamic routing protocols? (Choose two.)

select best path to destination networks

reduce network traffic

provide a default route to network hosts

provide network security

discover remote networks

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