Could You Pass This Hardest CISCO EIGRP Test Quiz?

A feasible successor route in EIGRP is an alternate route that is considered as a backup to the primary route (successor route). It is a route that meets the feasibility condition and can be used as a backup in case the primary route fails. This allows for faster convergence and increased network reliability as the backup route can be immediately used without any additional calculations or routing updates.

The default administrative distance of EIGRP internal routes is 90. Administrative distance is a metric used by routers to determine the trustworthiness of routing information received from different routing protocols. A lower administrative distance value indicates a higher priority for the routing protocol. In the case of EIGRP, the default administrative distance for internal routes is set to 90, which means that EIGRP routes are given higher priority compared to routes from other routing protocols with higher administrative distances.

The "debug" command is recommended only for troubleshooting specific types of network problems, not for monitoring normal network operation. This command enables the router to display detailed information about the internal operations and processes, which can be useful for diagnosing issues but can also generate a large amount of output and potentially impact the performance of the router. Therefore, it is not recommended for continuous monitoring of the network.

The correct answer is "Router# show ip route eigrp". This command specifically displays only the current EIGRP routing table entries. The "show ip route" command displays the entire IP routing table, while the "show eigrp route" command does not exist and the "show eigrp protocol" command displays information about the EIGRP protocol.

EIGRP uses the Real-Time Transport Protocol (RTP) to provide reliability for the transmission of routing information. RTP is a Layer 4 protocol that is commonly used for real-time multimedia applications, but in the case of EIGRP, it is utilized to ensure the reliable delivery of routing updates between EIGRP routers. RTP provides features such as sequence numbering, time-stamping, and error detection, which help to ensure the accurate and timely delivery of routing information.

The correct answer is R1(config-router)# no auto-summary, R2(config-router)# no auto-summary. The "no auto-summary" command is used to disable automatic summarization in EIGRP. By default, EIGRP automatically summarizes routes at network boundaries, which can cause connectivity issues between hosts in the same network. Disabling auto-summary ensures that EIGRP advertises the specific subnets, allowing for proper routing and connectivity between the two hosts.

EIGRP maintains three tables for each routed protocol it supports. The topology table stores information about all the routes learned from neighboring routers. The neighbor table keeps track of all the neighboring routers with which EIGRP has formed an adjacency. The routing table contains the best routes selected from the topology table and is used for forwarding packets. The ARP table, which is not maintained by EIGRP, is used to map IP addresses to MAC addresses in order to communicate on a local network.

The command "show ip eigrp topology all-links" is used to view all routes that are known by the router. This command displays detailed information about the EIGRP topology table, including all the routes and their associated metrics. It provides a comprehensive view of the network's routing table, allowing administrators to analyze and troubleshoot the EIGRP routing protocol.

Bounded updates in EIGRP refer to the process of sending updates only to routers that require the specific information being updated. This approach helps to minimize unnecessary network traffic by avoiding the transmission of updates to routers that do not need them. Instead, EIGRP selectively sends partial updates to the routers that require the updated information, ensuring efficient and targeted communication within the network.

The EIGRP DUAL algorithm stores the primary route to a destination in the routing and topology tables. The routing table contains the best routes to reach different destinations, while the topology table maintains information about all routes learned from neighboring routers. By storing the primary route in both tables, EIGRP ensures redundancy and allows for quick convergence in case of network changes or failures.

The advantage of routers forming adjacencies when using EIGRP is that new routers and their routes can quickly be discovered by neighbor routers. This allows for efficient and timely updates to the routing tables, ensuring that the network is aware of any new routers and their available routes. Additionally, a router can quickly discover when a neighbor router is no longer available, allowing for immediate rerouting and ensuring network reliability. Lastly, changes in network topology can quickly be shared with neighbor routers, allowing for dynamic adaptation to any changes in the network.

The first reason for configuring the bandwidth setting on an EIGRP interface is that if the bandwidth setting is higher than the actual bandwidth of the link, a suboptimal route may be chosen as the best path to a destination. This can result in inefficient routing and slower network performance. The second reason is that if the bandwidth setting does not match the actual bandwidth of the link, the network may be unable to converge. This means that the routing tables may not be properly updated, leading to potential routing issues and network instability.

The EIGRP neighbor table contains the network layer address of the neighbor routers, which is important for establishing and maintaining neighbor relationships. It also includes the number of EIGRP packets waiting to be sent, which helps in monitoring the status and congestion of the network. The other options mentioned, such as routes installed by DUAL, lowest calculated metric to each destination, and feasible distance to each neighbor, are not part of the EIGRP neighbor table.

The EIGRP topology database maintains information about the feasible distance of the route, which is the total metric calculated by EIGRP for a particular route. It also keeps track of the route cost as advertised by the neighboring router, which is the metric value advertised by the router that is directly connected to the destination network. The physical address of the gateway interface is not maintained in the EIGRP topology database.