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

Which of the following routing protocols uses an autonomous system number?
A . IS-IS
B . EIGRP
C . OSPF
D . BGP

Answer: D

Explanation:

BGP (Border Gateway Protocol) uses an Autonomous System (AS) number for its operations. An AS is a collection of IP networks and routers under the control of a single organization that presents a common routing policy to the Internet. BGP is used to exchange routing information between different ASes on the Internet, making it the only protocol among the listed options that uses an AS number.

Reference: CompTIA Network+ study materials and RFC 4271.

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