Cisco Enterprise Network Core Technologies (ENCOR) Practice Exam

The use of TCP port 179 for BGP (Border Gateway Protocol) is significant because it is the designated port for establishing BGP sessions between routers. BGP is a crucial protocol for exchanging routing information across the internet, particularly among different autonomous systems. The selection of a specific TCP port allows BGP to maintain reliable communication and session control, which is essential for the stability and security of routing information.

BGP operates over TCP to ensure that the protocol can provide a reliable connection for sending updates and keeping track of the status of connections. The requirement for a reliable transport layer protocol is paramount since routing information can change frequently and must be communicated without loss.

The other options represent ports assigned for different protocols or services: TCP 80 is typically used for HTTP, TCP 443 is commonly used for HTTPS, and TCP 22 is utilized for SSH. Each of these serves distinct functions that do not relate to BGP's purpose, making TCP port 179 the correct answer for this question.