CompTIA Network+ (N10-007) — Question 225

Which of the following will listen on the line to ensure there is no traffic transmitting and implement a back-off timer if a collision occurs?

Answer options

• A. CSMA/CD
• B. CSMA/CA
• C. MPLS
• D. OSPF

Correct answer: A

Explanation

The correct answer is CSMA/CD, which stands for Carrier Sense Multiple Access with Collision Detection. This protocol actively listens to the network to check for traffic and enforces a back-off timer if it detects a collision. CSMA/CA, on the other hand, is used to prevent collisions rather than detect them, while MPLS and OSPF serve different purposes related to routing and traffic engineering.