CCNA 640-802 V14 题库（16-20）

16. Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its networks to R2?

A. 172.1.0.0/22

B. 172.1.0.0/21

C. 172.1.4.0/22

D. 172.1.4.0/24

172.1.5.0/24

172.1.6.0/24

172.1.7.0/24

E. 172.1.4.0/25

172.1.4.128/25

172.1.5.0/24

172.1.6.0/24

172.1.7.0/24

Answer: C

17. Which spread spectrum technology does the 802.11b standard define for operation?

A. IR

B. DSSS

C. FHSS

D. DSSS and FHSS

E. IR, FHSS, and DSSS

Answer: B

18. Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition,assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affectthe operation of R2?

A. Any packet destined for a network that is not directly connected to router R1 will be dropped.

B. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.

C. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately

because of the lack of a gateway on R1.

D. The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0,

172.16.100.128, and 172.16.100.64 subnetworks.

E. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1.

R1 will then send that packet back to R2 and a routing loop will occur.

Answer: E

19. A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network.From this statement, what is known about the network interface port?

A. This is a 10 Mb/s switch port.

B. This is a 100 Mb/s switch port.

C. This is an Ethernet port operating at half duplex.

D. This is an Ethernet port operating at full duplex.

E. This is a port on a network interface card in a PC.

Answer: C

20. Refer to the topology and router configuration shown in the graphic. A host on the LAN is accessing an FTP TestInside    640-802   http://bbs.edify.com.cn/server across the Internet. Which of the following addresses could appear as a source address for the packetsforwarded by the router to the destination server?

A. 10.10.0.1

B. 10.10.0.2

C. 199.99.9.33

D. 199.99.9.57

E. 200.2.2.17

F. 200.2.2.18

Answer: D