Answer:
Collision or electromagnetic interference (EMI)
Step-by-step explanation:
Some network cables connected to switch or router ports are prone to internal collision (between two frames or packets) and external collision with electromagnetic waves from other sources (EMI).
Electromagnetic waves are also known as radio waves or signals. When they are transmitted, the network cable acts as a receiver, the received signal interferes with the packet in the cable. This is why the cyclic redundancy check (CRC) throws an error.