Which of the below routing protocol is a path vector routing protocol?

Which of the below routing protocol is a path vector routing protocol?

1. RIP
2. IGRP
3. Static Routing 
4. BGP

BGP (Border Gateway Protocol) is a path vector routing protocol.

But Why?

BGP is a path vector routing protocol that uses the routing information exchange between autonomous systems to determine the best route. It is used for inter-domain routing, and it can be based on multiple criteria like latency, cost, or reliability. BGP also supports the authentication of routes and allows complex rulesets to define paths.

• For example, an ISP could define a number of rules that ensure BGP only chooses the most reliable route and prioritizes routes based on cost or latency. This helps ISPs to optimize their network traffic performance. Furthermore, BGP also enables administrators to configure additional security measures such as authentication or encryption of routing updates.

In contrast, RIP and IGRP are examples of distance vector routing protocols that use hop count to determine the best route. Static routing is a manual configuration, where routes must be configured by an administrator.