Cisco CCNA mock exam questions sample test – Question 375

The router interfaces for a network are configured as shown in the following exhibit. (Click the Exhibit(s) button.)
376-q
Warehouse 1 is having trouble connecting to the Internet. After troubleshooting the issue, several other connectivity issues are discovered.
What should you do to fix this problem?

A. Change the IP address of the Warehouse 1 LAN interface.
B. Change the IP address of the Warehouse 1 WAN interface.
C. Change the IP address of the Main Office LAN Interface.
D. Change the IP address of the Main Office WAN interface.
E. Change the IP address of the Main Office Internet interface.

Correct Answer: D

Explanation:
You should change the IP address of the Main Office WAN interface.
With a 29-bit mask and the chosen class B address, the following network IDs are created:
172.16.0.0
172.16.0.8
172.16.0.16
172.16.0.24
172.16.0.32
172.16.0.40
172.16.0.48
172.16.0.56
172.16.0.64
…and so on, incrementing each time by 8 in the last octet. At the end of this series of increments, the network IDs will be:
172.16.1.240
172.16.1.248
172.16.2.0
172.16.1.248/29 is the subnet number for the WAN. This address cannot be used as a host address on the network. The legitimate addresses in this range are 172.16.0.249 through 172.16.0.254. This misconfiguration would cause both the Warehouse 1 and Warehouse 2 segment to have trouble connecting to the Internet.
All of the other addresses in the diagram are correct. The correct configuration of the network is shown in the following diagram:
376-a

Objective:
Network Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot IPv4 addressing and subnetting
References:
IP Addressing and Subnetting for New Users