EIGRP Interview Questions and Answers
In the dynamic world of networking, it’s crucial to be well-prepared for interviews, especially when you’re aiming for a position that involves managing and configuring routing protocols. Enhanced Interior Gateway Routing Protocol (EIGRP) is one such routing protocol used extensively in Cisco networks. Get equipped with these 15 most asked EIGRP interview questions and answers to perform better in your upcoming interview. These questions are curated by our experts, some of the most talented minds in the networking field. EIGRP, or Enhanced Interior Gateway Routing Protocol, is an advanced routing protocol developed by Cisco. It’s an enhanced version of the older Interior Gateway Routing Protocol (IGRP) and falls under the class of distance vector routing protocols. It utilizes the DUAL (Diffused Update Algorithm) to determine the shortest path. It is also referred to as a hybrid routing protocol since it possesses elements of distance vector and link-state routing protocols. Now, we will introduce you to the top EIGRP interview questions that are frequently asked in most interviews. Here are the most asked EIGRP interview questions and answers for freshers – To become successful neighbours, these are the requirements that must match for routers in a hello packet – A static neighborship should be defined on both sides. These are the requirements to form a neighborship in EIGRP. EIGRP router stores routing and topology information in Three tables – EIGRP does not disclose the subnet mask with the routing information by default, behaving instead like a classful routing protocol. No auto-summary command will guarantee that EIGRP sent the routing information and the subnet mask information. Hello Timer: Every five seconds (hello time), the router will broadcast a hello to its neighbours. Hold Timer: If the router does not hear from a neighbour after 15 seconds, it will assume that the link is down and terminate the neighbour relationship. The distance (metric) between the source and the destination network is known as Feasible distance. Given that it is the most effective way to reach a remote network, the route with this metric will be included in the routing table. The advertised distance is the distance separating a neighbour router from the target network. The reported distance is a destination network metric that a neighbour has reported. Here are the different EIGRP packet types – The new method of configuring EIGRP is called named mode. Under the router mode, this mode enables the hierarchical entry of EIGRP configurations. Multiple address families and autonomous system number combinations are possible for each named mode setup. Through Variance Command, EIGRP provides a method to load balance over cost-inequal pathways. The local best metric is multiplied by the variance (a number between 1 to 128), which includes the routes with a lesser or equivalent metric. When the Variance value is set by default to 1, equal-cost load balancing is indicated. Regarding convergence, EIGRP maintains a backup route. In case the current path to the destination network fails, it can immediately switch over to using the backup route, the feasible successor leading to faster convergence. These are the top 10 most asked EIGRP Interview Questions. Now, let’s see some important questions for experienced candidates. The router sends out query messages on all EIGRP-enabled interfaces and attempts to identify a new path to the network if the successor path is lost and there is no feasible successor path available. For that route, it is in an active status. The router is now awaiting a response from its neighbours. If a response is absent for three minutes, no neighbours respond, and the router stays in the active state. In this instance, the router re-established its neighbourly connection with the router that had not returned its query messages. Two approaches are utilised to resolve this issue: The following command is used to unstick the active timer that has become stuck: Router(config-router)# timers active-time disable Using the leak-map, you can only advertise a specific prefix within the bounds of a summary advertisement and the summary itself. In essence, all routers are simply running EIGRP 100 with auto-summary turned off. The main goals of the EIGRP stub routing function are to increase network stability and save memory and CPU on local routers. In hub-and-spoke networks, the stub routing function is most frequently employed. The split horizon is a strategy employed by distance vector routing systems to prevent routing loops. The idea is straightforward: a router won’t promote a route back onto the interface from where it was learned. On interfaces, split horizon is turned on by default. These are the commands that are used to troubleshoot EIGRP – These are our hand-picked top 15 EIGRP Interview questions and answers. We wish you all the best for your interview and hope these questions will be helpful. Please do comment in the comment box below to share your views and feedback. If you like this content, you can subscribe to our free newsletter to never miss out on any updates.Introduction
About EIGRP
EIGRP Interview Questions and Answers for Freshers
Q1 – What are the requirements for Neighborship in EIGRP?
Q2 – Which tables are maintained by EIGRP routers?
Q3 – Why “no auto-summary command” is used in EIGRP?
Q4 – What are the EIGRP Hello & Hold Timer?
Q5 – What is the Feasible distance?
Q6 – What are advertised Distance & Reported Distance?
Q7 – What are the EIGRP packet types?
Q8 – What are the EIGRP named mode?
Q9 – What are EIGRP variance values?
Q10 – What is the EIGRP Convergence?
EIGRP Interview Questions and Answers for Experienced
Q11 – How do I fix EIGRP stuck in active?
Q12 – What is a leak map in EIGRP?
Q13 – What is the EIGRP stub router?
Q14 – What is the split-horizon in EIGRP?
Q15 – Tell me some commands to troubleshoot EIGRP?
Conclusion
