Author: Asad Ijaz

NetworkUstad's lead networking architect with CCIE certification. Specializes in CCNA exam preparation and enterprise network design. Authored 2,800+ technical guides on Cisco systems, BGP routing, and network security protocols since 2018. Picture this: I'm not just someone who writes about tech; I'm a certified expert in the field. I proudly hold the titles of Cisco Certified Network Professional (CCNP) and Cisco Certified Network Associate (CCNA). So, when I talk about networking, I'm not just whistling in the dark; I know my stuff! My website is like a treasure trove of knowledge. You'll find a plethora of articles and tutorials covering a wide range of topics related to networking and cybersecurity. It's not just a website; it's a learning hub for anyone who's eager to dive into the world of bits, bytes, and secure connections. And here's a fun fact: I'm not a lone wolf in this journey. I'm a proud member and Editor of Team NetworkUstad. Together, we're on a mission to empower people with the knowledge they need to navigate the digital landscape safely and effectively. So, if you're ready to embark on a tech-savvy adventure, stick around with me, Asad Ijaz Khattak. We're going to unravel the mysteries of technology, one article at a time!"
CCNA January 11, 2020

What is EIGRP Topology Table

EIGRP uses a neighbor table, topology table, and IP routing table. The neighbor table maintains a state of neighbors. The topology table is used to store information about all known routes received from all neighbors. EIGRP Update messages send the routers’ EIGRP topology tables. The EIGRP topology table is a database of possible routes. Each […]
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Neighbour-Adjacency
CCNA January 10, 2020

Introduction to EIGRP Neighbor Adjacencies

Before exchanging any EIGRP update packets between routers, EIGRP must first discover its neighbor. EIGRP neighbor is an adjacent router running EIGRP on directly connected networks. EIGRP Hello packets are used to establish and maintain neighbor adjacencies. Several parameters between the two routers must match to become neighbors; for example, the same autonomous system number […]
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CCNA January 9, 2020

Examine EIGRP in the Routing Table

We can verify the EIGRP in the routing table using the “show ip route” command. It is important to verify the information in the routing table to ensure that it is populated as estimated, based on configurations entered. The automatic summarization is enabled by default before in the ISO 15. It is important to know […]
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CCNA January 8, 2020

Introduction to EIGRP Neighbors

EIGRP-enabled routers to establish neighbor adjacencies with other EIGRP-enabled routers by exchanging EIGRP Hello packets. Without establishing neighbor adjacencies routers cannot send or receive any updates. Using the “show ip eigrp neighbors” command, we can examine the neighbor’s table and verify EIGRP adjacencies. Figure 1 illustrates the output of the “show ip eigrp neighbors” command. […]
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Network diagram illustrating EIGRP passive-interface configuration with three routers and connected devices.
CCNA January 7, 2020

How to Configure EIGRP Passive-Interface

A passive interface is used in all routing protocols, where we can stop sending updates from a specific interface. The behavior varies from o­ne protocol to another. In EIGRP, using the passive-interface, we stop sending outgoing hello packets; therefore, the router cannot form any neighbor adjacencies via the passive interface. This behavior stops both outgoing […]
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CCNA January 6, 2020

The Network Command – Exclusive Explanation

The network command has the same function as in all IGP routing protocols. It enables any interface on this router that matches the network address. It enables EIGRP routing on an interface, using the command in router configuration mode and enter the classful network address for each directly connected network. The command syntax is as […]
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CCNA January 5, 2020

Mastering EIGRP Router ID Configuration

EIGRP router ID is a 32-bit unique identifier identifying the router in the EIGRP domain. The router ID (RID) is represented in the same way as the IPv4 address. The router ID is used both in EIGRP and OSPF, while the role of the router ID is more significant in OSPF. EIGRP automatically selects the […]
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CCNA January 4, 2020

Introduction to “Router EIGRP” Command

The “router” command in global configuration mode is an important command for start configuration of any dynamic routing protocol. The topology displayed in Figure 1 is used to configure and demonstrate the EIGRP routing protocol. Figure 2 (marked with a red triangle) illustrates the “router ?” with question marks to demonstrate the list of dynamic […]
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Autonomous system numbers
CCNA January 4, 2020

Introduction to Autonomous System Numbers (ASNs)

Autonomous system numbers (ASNs) is a unique identifier that is globally available and allows its autonomous system to exchange routing information with other systems. An Internet Assigned Numbers Authority (IANA) globally assigned autonomous system is a group of networks under the administrative control of a single body that presents a common routing policy to the […]
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CCNA January 3, 2020

EIGRP Packet Types – Exclusive Explanation

EIGRP uses 5 different types of packet in communication with its neighbours. EIGRP packets are sent with reliable or unreliable delivery and can be sent as a unicast, multicast, or sometimes both. EIGRP packet types are also called EIGRP packet format or EIGRP messages. The details of the EIGRP packets are the following: EIGRP Hello […]
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