CCNA 640-802 V14 题库（26-30）

26. Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack ofconnectivity?

A. A loopback is not set.

B. The IP address is incorrect.

C. The subnet mask is incorrect.

D. The serial line encapsulations are incompatible.

E. The maximum transmission unit (MTU) size is too large.

F. The bandwidth setting is incompatible with the connected interface.

Answer: B

27. Refer to the exhibit. Which switch provides the spanning-tree designated port role for the network segmentthat services the printers?

A. Switch1

B. Switch2

C. Switch3

D. Switch4

Answer: C

28. Refer to the exhibit. Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4. What willSwitch-1 do with this data?

A. Switch-1 will drop the data because it does not have an entry for that MAC address.

B. Switch-1 will flood the data out all of its ports except the port from which the data originated.

C. Switch-1 will send an ARP request out all its ports except the port from which the data originated.

D. Switch-1 will forward the data to its default gateway.

Answer: B

29. In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links?

A. 255.255.255.0

B. 255.255.255.240

C. 255.255.255.248

D. 255.255.255.252

E. 255.255.255.254

Answer: D

30. Refer to the exhibit. Why would the network administrator configure RA in this manner?

A. to give students access to the Internet

B. to prevent students from accessing the command prompt of RA

C. to prevent administrators from accessing the console of RA

D. to give administrators access to the Internet

E. to prevent students from accessing the Internet

F. to prevent students from accessing the Admin network

Answer: B