You have a customer who says one of the computers in her office can’t connect to the local network or to the Internet. You check, and the network configuration settings on the computer are correct. You open a command line window and at the prompt, you type “ping loopback†and then press enter. What are you testing?
A. You are testing the NIC on the computer.
B. You are testing the network cable.
C. You are testing the connection to the gateway.
D. You are testing the connection to the DHCP server.
Solution
A. Although a computer is assigned an IP address either manually or dynamically, each network interface card, or NIC, on a computer can be tested by pinging the loopback address, which is typically 127.0.0.1 for IPv4 and ::1 for IPv6. You can ping the loopback address by issuing either the command “ping loopback†or “ping 127.0.0.1.†If there’s a problem with the computer’s NIC, you won’t receive a ping reply.
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1. You have a customer who says one of the computers in her office can’t connect to the local
network or to the Internet. You check, and the network configuration settings on the computer
are correct. You open a command line window and at the prompt, you type “ping
loopback― and then press enter. What are you testing?
A. You are testing the NIC on the computer.
B. You are testing the network cable.
C. You are testing the connection to the gateway.
D. You are testing the connection to the DHCP server.
Solution
A. Although a computer is assigned an IP address either manually or dynamically, each network
interface card, or NIC, on a computer can be tested by pinging the loopback address, which is
typically 127.0.0.1 for IPv4 and ::1 for IPv6. You can ping the loopback address by issuing either
the command “ping loopback†or “ping 127.0.0.1.†If there’s a problem with the
computer’s NIC, you won’t receive a ping reply.
