Understanding the Diffusing Update Algorithm
The Diffusing Update Algorithm (DUAL) is a key component of the Enhanced Interior Gateway Routing Protocol (EIGRP), making it an essential routing protocol used in various networks.
What is EIGRP?
- EIGRP is a Cisco proprietary routing protocol.
- It combines the benefits of distance vector and link-state protocols.
- It is designed for more efficient routing within large enterprise networks.
How DUAL Works
- DUAL provides a loop-free environment through a process of "diffusing updates."
- It calculates the best path to a destination based on the following metrics:
- Bandwidth
- Delay
- Load
- Reliability
- DUAL ensures that all routers have a consistent view of the network topology.
Key Features of DUAL
- Fast Convergence: DUAL allows routers to quickly adapt to changes in the network, reducing downtime.
- Backup Routes: It maintains a backup route for quick switchover in case the primary route fails.
- Scalability: EIGRP can effectively manage large networks using hierarchical routing.
Comparison with Other Protocols
- IS-IS: Uses link-state principles but does not implement DUAL.
- IGRP: The predecessor to EIGRP, it uses simpler distance vector techniques.
- OSPF: A link-state protocol; however, it does not utilize DUAL, focusing instead on a more complex algorithm for path calculation.
In conclusion, the correct answer to the question is option 'C' EIGRP, as it uniquely implements the Diffusing Update Algorithm, offering enhanced capabilities for modern networking needs.