Which of the following routing protocols is used to exchange route information between public autonomous systems?
Correct Answer: B
BGP (Border Gateway Protocol) is a routing protocol that is used to exchange route information between public autonomous systems (AS). An AS is a network or a group of networks that are under the same administrative control and share a common routing policy. BGP is the standard protocol for interconnecting different AS on the Internet, allowing them to exchange information about the reachability and availability of IP prefixes. BGP is also used for traffic engineering, load balancing, and policy-based routing. The other options are not routing protocols that are used to exchange route information between public autonomous systems, as they either operate within a single AS, use a different addressing scheme, or are obsolete.
References: CISSP - Certified Information Systems Security Professional, Domain 4. Communication and Network Security, 4.1 Implement secure design principles in network architectures, 4.1.1 Apply secure design principles to network architecture, 4.1.1.1 OSI and TCP/IP models; CISSP Exam Outline, Domain 4.
Communication and Network Security, 4.1 Implement secure design principles in network architectures, 4.1.1 Apply secure design principles to network architecture, 4.1.1.1 OSI and TCP/IP models