Are you preparing for the role of a Network Engineer? If yes, then it is a must to have in-depth knowledge about routing protocols. One of the in-demand routing protocols is the Enhanced Interior Gateway Routing Protocol (EIGRP).
We will cover the most frequently asked EIGRP interview questions and their answers. These questions and answers would help you to crack interviews for the network engineer and network administrator roles. EIGRP is an important concept to learn during the Cisco Certified Network Professional (CCNP) course.
Let us now begin with the list of EIGRP interview questions and answers!
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EIGRP is one of the most popular routing protocols and is partially an open-source protocol made by Cisco, which stands for Enhanced Interior Gateway Routing Protocol (EIGRP), released in 1993. After 2013, it was made open for public use.
EIGRP is used for Internet Protocol (IP) networks and is a classless and advanced distance vector routing protocol used in a computer network for automating routing decisions and configurations. It is also mentioned as a hybrid routing protocol since it uses information from link-state routing protocols and distance vector routing protocols.
The primary function of EIGRP is to share routes with other routers present in an autonomous system (AS). Therefore, this routing protocol gets used in a router and is distinct from other routing protocols like RIP since it does not send updates in one go, which reduces the workload on a router where data can get transferred easily in smaller packets.
EIGRP is an advanced version of Interior Gateway Routing Protocol (IGRP). Since the networks shifted to using classless IPv4 addresses in the Internet Protocol that IGRP could not support, EIGRP got invented.
There are three types of EIGRP tables, namely-
The explanations of these EIGRP tables are as follows-
Neighbour table:
Topology table:
Routing table:
EIGRP neighbours must satisfy the following conditions-
The authentication and configuration of both routers must be the same.
Even though EIGRP can propagate a default route with the default network method, it is not required for EIGRP to use an IP default-network command. All the default routes are redistributed directly by EIGRP.
There are five kinds of EIGRP packets to enable communication between two neighbouring routers, namely-
Hello Packets
Update Packets
Acknowledgement Packets
Query Packets
Reply Packets
The advantages of using the EIGRP routing protocol are as follows-
The routers select EIGRP routing ID as follows-
Since all the data packets get sourced from the primary addresses by EIGRP, it prioritizes finding neighbouring routers with primary addresses. It is hard to make it work with routers of primary addresses if it chooses a secondary address.
Still, EIGRP supports secondary addresses.
EIGRP link type | Hello interval | Hold Dow interval |
High speed link (broadcast/LAN) | 5 seconds | 15 seconds |
Low speed links (NBMA/WAN) | 60 seconds | 180 seonds |
The subnet mask is not visible with the routing information in EIGR by default. This command unmasks the subnet mask information and the routing information.
The feasible distance is the distance between the source and the destination network. It is the most efficient distance travelled to transfer information.
The stuck inactive message is sent by a router when it does not receive a reply to its query. If the path mentioned gets erased, the “stuck inactive” message pops up.
That is all for the top most-asked EIGRP interview questions and answers. It is mandatory to first enroll in a CCNP course to learn in-depth about these routing protocols.
Happy Learning!