CompTIA 220-801 Certification Practice Test

Answer - A - Worms self replicate in the system, while Trojans performs undisclosed malicious activities on the host computer.

Key Takeaway: A computer worm is a self-replicating computer program. It uses a network to send copies of itself to other nodes and it may do so without any user intervention. Unlike a virus, it does not need to attach itself to an existing program. Worms almost always cause at least some harm to the network, if only by consuming bandwidth. Viruses almost always corrupt or devour files on a targeted computer. A Trojan is a malware that appears to perform a desirable function but in fact facilitates unauthorized access to the user's computer system.