Routing Protocol Comparison: Security Considerations and Applicability for Different Network Environments

 All routing protocols can be susceptible to attacks if not properly configured and secured. When properly configured and of these choices, RIP, OSPF, IS-IS, EIGRP and BGP, BGP provides higher security in stopping an attack, because it was designed as security for WANs, whereas, the others are designed for LAN security.  Accounting for security measures that address interconnected LANs, otherwise known as WANs, the protocol adds additional security measures for stopping an attack. In smaller organizations, the complexity of BGP may introduce more challenges than are beneficial when a simpler protocol can be implemented that provides sufficient LAN security. For example IS-IS provides a flexible, compatible, scalable solution for small networks.

Protocol Descriptions
RIP: Seeks out the best path between the source and the destination network using a hop count between hosts methodology to determine the best route for networking. While RIP quickly adapts to changes in small networks where it quickly assesses hops between hosts, it does not scale well in large, complex infrastructures. RIP focuses on speed and simplicity and often misses the mark on efficiency and adaptability. 

OSPF: Seeks out the closest neighbor instead of searching for the fastest route between the source and the destination. According to IBM, “OSPF is more suitable for serving large, heterogeneous internetworks. OSPF can recalculate the routes in a short amount of time when the network topology changes.” This suggests that OSPF provides a scalable, predictable solution for large, changeable networks. Through mutual support, nearby routers link together to create an efficient exchange of information. Insecure and prone to attack because it leaps for connection without looking.

IS-IS: Seeks out the closest neighbor, but utilizes a different protocol to link. IS-IS updates the neighbor by sending Connectionless Network Service packets instead of establishing a connection to the neighbor. Native multicast routing. Scales well in large networks with complex configurations as it can handle different types of protocols. Because IS-IS runs over Layer 2, it is much more secure, scalable, and flexible than OSPF.

EIGRP: Seeks out neighbors in the close area creating a powerful, fast, incremental solution with much lower CPU and memory needs than OSPF, much faster, and much easier to configure. It works well in both small and large networks. Plus it’s cool. Who doesn’t want to learn about DUAL distance vector algorithms? Limited to CISCO devices.

BGP: Considers all available paths and determines the best path. Slow and analytical for larger networks that need more consideration over quick solutions. Operates over WAN, so it has a lower data transfer rate; however, it’s very reliable and common in mainstream enterprises.

References:
RIP: https://www.geeksforgeeks.org/routing-information-protocol-rip/
OSPF: https://www.ibm.com/docs/en/i/7.4?topic=routing-open-shortest-path-first
IS-IS: https://www.geeksforgeeks.org/difference-between-ospf-and-is-is/
https://ipwithease.com/ospf-vs-isis/
EIGRP: https://community.fs.com/blog/eigrp-vs-ospf-differences.html
BGP: https://www.linkedin.com/advice/0/how-does-bgp-security-benefit-your

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