What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)
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A. B. C. D. E.AE.
When designing an EIGRP network that consists of more than 1000 routers, it is important to consider scaling techniques to ensure the network can accommodate the large number of routers and the associated traffic. Two valid scaling techniques for an EIGRP network of this size are:
A. Use structured hierarchical topology with route summarization: This technique involves dividing the network into smaller, manageable areas or domains, and summarizing the routing information at the borders of each area. This reduces the amount of routing information that needs to be processed and exchanged between routers, improving the efficiency and scalability of the network. By using a hierarchical topology, routing updates can be more easily contained within a particular area, reducing the likelihood of routing loops or other issues.
B. Use sub-second timers: EIGRP uses several timers to control various aspects of its operation, including the frequency of routing updates and the length of time before a neighbor is considered unreachable. By setting the timers to sub-second intervals, EIGRP can respond more quickly to changes in the network topology, improving convergence times and reducing the likelihood of routing loops or other issues. However, it is important to ensure that the network infrastructure can support such rapid updates without causing excessive load or instability.
C. Use the distribute-list command to filter routes: While this technique can be useful for limiting the scope of EIGRP updates, it is not typically considered a primary scaling technique for networks of this size. The distribute-list command can be used to filter out unwanted or redundant routes, reducing the amount of routing information that needs to be processed and exchanged. However, this can also lead to suboptimal routing decisions if critical routes are filtered out, and may require careful management to ensure proper operation.
D. Modify delay parameters on the links: Modifying the delay parameters on links can be used to influence the path selection process in EIGRP, by making certain links appear more or less desirable based on their delay characteristics. However, this technique may not be effective for networks of this size, as it can be difficult to manage and may not provide sufficient granularity for controlling routing decisions.
E. Implement multiple EIGRP autonomous systems: This technique involves dividing the network into separate EIGRP autonomous systems, each with its own set of routing policies and parameters. While this can be useful for limiting the scope of routing information and improving scalability, it can also lead to increased complexity and potential issues with inter-domain routing. As such, it is not typically considered a primary scaling technique for networks of this size.
In summary, the two most valid scaling techniques for an EIGRP network that consists of more than 1000 routers are to use a structured hierarchical topology with route summarization and to use sub-second timers. These techniques can help to reduce the amount of routing information that needs to be processed and exchanged, improve convergence times, and reduce the likelihood of routing loops or other issues.