What is the IP protocol number associated with EIGRP?

The correct answer is 89. EIGRP, which stands for Enhanced Interior Gateway Routing Protocol, is a Cisco proprietary routing protocol that uses the Internet Protocol (IP) to exchange routing information between routers. Each IP protocol is assigned a unique number for identification, and for EIGRP, that protocol number is 89.

Using this protocol number, routers can recognize EIGRP packets amidst other types of IP traffic, allowing them to effectively participate in routing decisions. This is especially important in complex networking environments where multiple routing protocols may be in use.

Understanding the assigned protocol numbers is crucial for network troubleshooting and design, as it helps identify and differentiate between the various protocols being utilized on a network. Knowing that EIGRP is associated with protocol number 89 is essential for anyone studying for the CCNA certification.