Exterior Routing Protocols

BC

Exterior routing protocols are used to determine the optimal path for data traffic between autonomous systems (AS), which are collections of networks that operate under a common administrative domain. There are several exterior routing protocols available, including Border Gateway Protocol (BGP) and Exterior Gateway Protocol (EGP).

The two true statements about exterior routing protocols are:

B. They determine the optimal path between autonomous systems. This statement is true because exterior routing protocols determine the best path for data traffic between autonomous systems. BGP is the most commonly used exterior routing protocol, and it uses policies and rules to determine the best path for data traffic.

C. BGP is the current standard exterior routing protocol. This statement is not entirely true. BGP is a commonly used exterior routing protocol, but it is not the only one. EGP is an older exterior routing protocol that was used before BGP, but it is no longer used in modern networks. Additionally, the term "standard" can be subjective, as different organizations may have different preferences for which routing protocols they use.

Therefore, the correct answer is B and D. D. Most modern networking supports both EGP and BGP for external routing. This statement is true because most modern networking equipment supports both EGP and BGP for external routing. However, it should be noted that EIGRP is not an exterior routing protocol, but an Interior Gateway Protocol (IGP) used for routing within a single autonomous system.