CCNA Discovery 2: DsmbISP Chapter 6 Exam Answers v4.0

1. Refer to the exhibit. Which configuration command or commands contributed to the output that is shown?

• routerA(config-router)# no version 2
• routerA(config)# interface fa0/0
• routerA(config-if)# ip address 172.19.0.0 255.255.0.0
• routerA(config-router)# network 192.168.3.0
• routerA(config)# no ip default-gateway

2. Refer to the exhibit. What is the maximum number of RIP routers that could separate HostA and HostB and still leave the hosts with connectivity to each other?

• 14
• 15
• 16
• 17

3. In which situation would a company register for its own autonomous system number (ASN)?

• when the company’s ISP adds connection points to the Internet
• when additional routers are added to the corporate internetwork
• when more than one interior routing protocol is used
• when the company uses two or more ISPs

4. Consider this routing table entry

R 172.16.1.0/24 [120/1] via 200.1.1.1 00:00:27 Serial0/1

What type of route is this?

• a static route
• a default route
• a RIP route
• an OSPF route
• an EIGRP route
• a directly-connected route

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

• Exterior routing protocols are only used by large ISPs. Interior routing protocols are used by small ISPs.
• Interior routing protocols are used to route on the Internet. Exterior routing protocols are used inside organizations.
• 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 communicate within a single autonomous system. Exterior routing protocols are used to communicate between multiple autonomous systems.

6. What information is included in RIPv2 routing updates that is not included in RIPv1 updates?

• metric
• subnet mask
• area identification
• hop count
• autonomous system number

7. Which routing protocol is used to exchange data between two different ISPs?

• BGP
• EIGRP
• OSPF
• RIP v2

8. Which command is used to view the RIP routing protocol settings and configuration?

• show version
• show ip route
• show interface
• show ip protocols

9. Refer to the exhibit. If all routers are running RIP and network 10.0.0.0 goes down, when will R3 learn that the network is no longer available?

• in 30 seconds
• in 60 seconds
• in 90 seconds
• Immediately

10. What statement is true regarding an AS number?

• AS numbers are controlled and registered for Internet use.
• Interior routing protocols require registered AS numbers.
• ISPs require all customers to have registered AS numbers.
• All routers at an ISP must be assigned the same AS number.

11. What is the purpose of the network command used when configuring RIP?

• to specify whether RIPv1 or RIPv2 will be used as the routing protocol
• to allow the router to monitor RIP updates that occur on other routers
• to identify which networks on the router will send and receive RIP updates
• to configure the IP address on an interface that will use RIP
• to identify all of the remote networks that should be reachable from the router

12. Which command would a network administrator use to determine if the routers in an enterprise have learned about a newly added network?

• router# show ip address
• router# show ip route
• router# show ip networks
• router# show ip interface brief
• router# debug ip protocol
• router# debug rip update

13. 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.

14. What device enables an ISP to connect with other ISPs to transfer data?

• border gateway router
• DSLAM
• web server
• interior router

15. Which command will display RIP routing updates as they are sent and received?

• show ip route
• show ip rip
• debug ip rip
• show ip protocols
• show ip rip database

16. Which part of an IP packet does the router use to make routing decisions?

• source IP address
• source MAC address
• destination IP address
• destination MAC address

17. What two types of businesses would benefit from registering as their own autonomous systems? (Choose two.)

• a home business with one ISP connection
• a global business with connections to multiple local ISPs
• a medium-sized nationwide business with Internet connectivity through different ISPs
• a large enterprise with two connections to the same ISP
• a small ISP with a single Internet connection through a larger ISP

18. Which command will display RIP activity as it occurs on a router?

• debug ip rip
• show ip route
• show ip interface
• show ip protocols
• debug ip rip config
• show ip rip database

19. 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.

20. Which two statements describe static routes? (Choose two.)

• They are created in interface configuration mode.
• They require manual reconfiguration to accommodate network changes.
• They automatically become the default gateway of the router.
• They are identified in the routing table with the prefix S
• They are automatically updated whenever an interface is reconfigured or shutdown.

21. Which two statements or sets of statements describe differences between link-state and distance vector routing protocols? (Choose two.)

• Link-state routing protocols routinely use more bandwidth for updates than do distance vector routing protocols.
• Distance vector routing protocols update all routers at one time. Link-state routing protocols update one router at a time.
• Link-state routers only know about directly connected routers. Distance vector routers know about every router in the network.
• Link-state routing protocols update when a change is made. A network using distance vector routing protocols only updates at a specific interval.
• Distance vector routing protocols have limited information about the entire network. Link state routing protocols know about all routers in the network.
• In case of similar topologies, networks using link-state routing protocols typically converge more rapidly than do networks using distance vector routing protocols.

22. Which protocol is an exterior routing protocol?

• BGP
• EIGRP
• OSPF
• RIP

23. Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)

• Ping
• show arp
• Traceroute
• show ip route
• show interface
• show cdp neighbor detail

24. What term refers to a group of networks that uses the same internal routing policies and is controlled by a single administrative authority?

• Internet
• intranet
• virtual private network
• autonomous system