Security is an important part of any network and should be extended to the routing protocol by implementing neighbor authentication. Without this authentication, unauthorized or deliberately malicious routing updates can compromise the security of network traffic. EIGRP neighbor authentication can be configured in such a way that routers can participate in routing based on predefined passwords. EIGRP is a scalable routing protocol, which ensures that as a network grows larger, it operates efficiently and adjusts rapidly to changes. It is important as a Cisco administrator to have an understanding of how to configure EIGRP to prevent common routing problems that hinder network scalability. For example, implementing EIGRP stub routers to limit the EIGRP query range, making EIGRP more scalable with fewer complications. This course covers EIGRP Message Digest 5 (MD5) authentication and how to configure and verify it. Advanced EIGRP features and practical EIGRP-specific design and configuration techniques to implement an effective, scalable network are also examined.

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