A Domain.com technician has installed an Ethernet network adapter card on a new computer and connected it to the network. However, the amber light on the network adapter card flashes continually. What is the nature of this problem?

A.
Data is being transmitted to the computer.

B.
Transmission collisions are occurring.

C.
The network cable is faulty.

D.
The network is down.

Explanation:
The amber light is the collision light and indicates that Ethernet collisions are occurring. This light will flash continually because collisions are common on Ethernet networks.
Incorrect Answers:
A: The green light on a NIC or hub is the link light and indicates that the NIC and hub are making a logical Data Link layer connection.
C: If there is a problem between the NIC and the hub, the green link light on the NIC and the hub would be off.
D: The lights on a NIC or hub do not indicate if a network is down. They only indicate connectivity or transmissions collisions on a particular link.
References:
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda CA, 2005, pp. 430-431.