CompTIA Network+ Question C-33

While troubleshooting a connectivity issue, a network technician determines the IP address of a number of workstations is 169.254.0.0/16 and the workstations cannot access the Internet. Which of the following should the technician check to resolve the problem?

A. Default gateway address
B. Misconfigured DNS
C. DHCP server
D. NIC failure

Correct Answer: C

Explanation:
If a DHCP server fails, the workstations are assigned an address from the 169.254.0.0 address range by Automatic Private IP Addressing (APIPA). APIPA also configures a suitable subnet mask, but it doesn’t configure the system with a default gateway address. This allows communication on the local network, but not externally.

CompTIA Network+ Question A-90

A network engineer is troubleshooting an issue with a computer that is unable to connect to the Internet. The network engineer analyzes the following output from a command line utility:
Network DestinationNetmaskGatewayInterface 192.168.1.0 255.255.255.0192.168.1.254eth0
192.168.1.10255.255.255.255192.168.1.10eth0
127.0.0.1255.0.0.0On-Linlo
127.0.0.0255.0.0.0On-Linklo
255.255.255.255255.255.255.255102.168.1.10eth0
Which of the following is the reason for the computer issue, given the above output?

A. Wrong default gateway netmask
B. Incorrect default gateway address
C. Default gateway on the wrong interface
D. Missing default gateway

Correct Answer: D

Explanation:
The output appears to be a result of running the netstat –r command. If the default gateway was present, the first line would show the Network Destination as 0.0.0.0 and the Netmask as 0.0.0.0.