CCNA2 - Module 6 Exam Answers （05/08/2008 14:30）

1 、 What can be concluded about the routing process on a router if the commands router rip and network 192.5.5.0 have been issued? (Choose three.)

• A distance vector routing protocol was used.
• A link-state routing protocol was used.
• Routing updates will broadcast every 30 seconds.
• Routing updates will broadcast every 90 seconds.
• Hop count is the metric used for route selection.
• Bandwidth, load, delay, and reliability are the metrics used for route selection.

 

2 、 Which two protocols use an addressing scheme to direct user traffic? (Choose two.)

• IP
• EIGRP
• IPX
• OSPF
• RIP

3 、 What are some of the advantages of using a link-state routing protocol instead of a distance vector routing protocol? (Choose two.)

• The topology database eliminates the need for a routing table.
• Frequent periodic updates are sent to minimize the number of incorrect routes in the topological database.
• Routers have direct knowledge of all links in the network and how they are connected.
• After the inital LSA flooding, they generally require less bandwidth to communicate changes in a topology.
• Link-state protocols require less router processor power than distance vector protocols.

4 、 If dynamic routing is not configured on a router, how do routing table updates occur?

• Link state advertisements are sent from other routers.
• Updates are made to the routing table by the administrator.
• Best path information is communicated by network hosts.
• The routing table is updated by neighboring routers.

5 、 Why is fast convergence desirable in networks that use dynamic routing protocols?

• Routers will not allow packets to be forwarded until the network has converged.
• Hosts are unable to access their gateway until the network has converged.
• Routers may make incorrect forwarding decisions until the network has converged.
• Routers will not allow configuration changes to be made until the network has converged.

 

6 、 What is the purpose of a routing protocol?

• It is used to build and maintain ARP tables.
• It provides a method for segmenting and reassembling data packets.
• It allows an administrator to devise an addressing scheme for the network.
• It allows a router to share information about known networks with other routers.
• It provides a procedure for encoding and decoding data into bits for packet forwarding.

7 、 Which are the primary functions used by a router when forwarding data?(Choose two.)

• data encryption
• error notification
• packet switching
• address identification
• path determination
• packet validation

 

8 、 How does a router learn about routes to a network? (Choose three.)

• Information is gathered from its own configuration regarding directly connected networks.
• Switches forward destination address information to each router.
• Hosts communicate destination network information to each router.
• Other routers forward information about known networks.
• Routes are entered manually by a network administrator.
• Routes are learned from information gathered from ARP tables.

 

9 、 Which type of address does a router use to make routing decisions?
• source IP address
• source MAC address
• destination IP address
• destination MAC address

10 、 Describe the switching function that occurs in a router.
• allows the router to make forwarding decisions based on Layer 2 addressing

• uses network addressing to select the best route and interface to forward data
• accepts a packet on one interface and forwards it to a second interface
• enables the router to select the most appropriate interface for forwarding a packet

 

11 、 Select the statements that describe link-state routing processes? (Choose three.)

• Each router develops its own map of the entire network.
• Routers send triggered updates when changes in the network occur.
• Link-state routing protocols place a higher load on router resources during the routing protocol initialization.
• Link-state protocols are more prone to routing loops than distance vector routing protocols.
• Networks using link-state routing protocols are slower to reach convergence after changes have occurred than those using distance vector protocols.

 

12 、 Why is it necessary to specify a list of networks when configuring an interior routing protocol?

• to tell the router how to reach those networks
• to tell the router which attached networks participate in routing updates
• to tell the router which set of metrics to use for the attached networks
• to tell the router which routing protocol to use

 

13 、

Assuming that the network shown in the graphic is converged and dynamic routing is enabled, which of the following conditions will cause a modification to the Orlando routing table? (Choose two.)

• The device connecting the S0 interface of the Tampa router to the serial link loses power.
• A network administrator shuts down the Orlando router E0 interface.
• A DCHP server connected to the Tampa E1 network loses power.
• The IP address of a workstation on the Orlando E0 network is reassigned.
• A host on the Orlando E1 network transmits data to a server on the Tampa E1 network.
• A Telnet connection to the Orlando router fails.

14 、 All routers at a medium sized company have been upgraded. During the upgrade, the network administrator determined that a more advanced routing protocol using a combination of both distance vector and link state features should be implemented. Which protocol should be selected?

• RIP
• BGP
• OSPF
• EIGRP

 

15 、 Which category of routing algorithms discovers and maintains a topological map of the entire internetwork?

• static
• Bellman-Ford
• exterior gateway
• Internetwork Packet Exchange
• distance vector
• link-state

16 、 Which is an exterior routing protocol commonly used between ISPs?

• RIP
• BGP
• OSPF
• EIGRP

 

17 、 Which of the following statements are true regarding the command ip route 172.16.1.0 255.255.255.0 172.16.2.1? (Choose three.)

• This command is used to set up a static route.
• This command is used to set up a default route.
• This command is entered from global configuration mode.
• All packets intended for network 172.16.1.0 will be sent to gateway 172.16.2.1.
• All packets intended for network 172.16.2.1 will be sent to gateway 172.16.1.0.

 

18 、

Referring to the diagram, which commands will enable hosts on the Idaho E0 network to reach hosts on the E0 network of the Montana router? (Choose two.)

• Montana(config)# ip route 172.31.5.0 255.255.255.0 172.31.5.1
• Montana(config)# ip route 172.31.3.0 255.255.255.0 172.31.4.1
• Idaho(config)# ip route 172.31.5.0 255.255.255.0 172.31.4.1
• Idaho(config)# ip route 172.31.5.0 255.255.255.0 172.31.4.2
• Idaho(config)# ip route 172.31.5.1 255.255.255.0 172.31.4.1

19、

Which of the following are valid static IP routes? (Choose three.)

• RouterB(config)# ip route 192.168.5.0 255.255.255.0 S1
• RouterC(config)# ip route 192.168.1.0 255.255.255.0 S1
• RouterA(config)# ip route 192.168.3.0 255.255.255.0 192.168.2.2
• RouterB(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.2
• RouterC(config)# ip route 192.168.2.0 255.255.255.0 192.168.4.1
• RouterA(config)# ip route 192.168.4.0 255.255.255.0 192.168.2.1

 

20 、 Given the command, RouterC(config)# ip route 197.5.2.0 255.255.255.0 192.10.1.1, what does the address 192.10.1.1 represent?

• the source host
• the next hop router
• the outbound interface
• the destination network

 

21 、 Which of the following conditions must be met in order for a network to have converged?

• The routers in the network are operating with dynamic routing protocols.
• The routers in the network are operating with compatible versions of IOS.
• The routers in the network are operating with the same routing tables.
• The routers in the network are operating with consistent routing knowledge.

22 、 Which two statements describe autonomous systems? (Choose two.)

• Interior gateway protocols are used between autonomous systems.
• Exterior gateway protocols are used between autonomous systems.
• An autonomous system may be under the control of multiple organizations.
• An autonomous system is identified by a 16 bit number assigned by ARIN.
• The autonomous system is identified in the network portion of the IP address.