CompTIA Network+ (N10-009) — Question 154

Which of the following routing protocols uses an autonomous system number?

Answer options

• A. IS-IS
• B. OSPF
• C. BGP
• D. EIGRP

Correct answer: C

Explanation

BGP is the only routing protocol listed that utilizes an autonomous system number for routing decisions, making it suitable for inter-domain routing. The other protocols, such as IS-IS, OSPF, and EIGRP, function within a single autonomous system and do not require an AS number for their operation.