Understanding EIGRP's Administrative Distance: What You Need to Know

What is the administrative distance for EIGRP?

• A. 90
• B. 100
• C. 110
• D. 120

Answer: (A)

The administrative distance (AD) for Enhanced Interior Gateway Routing Protocol (EIGRP) is 90. This value is crucial as it indicates the trustworthiness of the routing information received from different routing protocols. The lower the administrative distance, the more preferred that route is over others. In the context of various routing protocols, EIGRP's AD of 90 makes it more reliable than other protocols, such as OSPF, which has an AD of 110, and RIP, which stands at 120. This trustworthiness can significantly influence a router's decision-making process regarding which routing information to use when multiple routes exist to the same destination. Understanding administrative distance is essential for configuring and troubleshooting routing protocols within a network, as it directly affects how routes are prioritized and selected.

When you're navigating the labyrinth of networking, you stumble upon terms that can really twist your brain around—like administrative distance. Now, let’s put our focus on EIGRP, or Enhanced Interior Gateway Routing Protocol, which has a key administrative distance of 90. You might be wondering, 'Why does that even matter?' Well, grab a cup of coffee, and let's break it down.

Think of administrative distance as a ranking system for trustworthiness among different routing protocols. It’s like a popularity contest, where EIGRP has a VIP pass because it’s the most reliable choice with that low AD of 90. Comparatively, its competitors don’t have quite the same clout; OSPF stands at 110 and RIP lags behind at 120. So, when your router is faced with multiple routes to a destination, trust me, it’s going to favor EIGRP.

But what’s in a number? A lot, actually. This value tells your router, “Hey, I can trust this route more than others.” That means quicker and more efficient routing decisions—something we all want, right? No one likes their data taking the scenic route!

Understanding this concept is crucial, especially if you're knee-deep in network configurations or troubleshooting issues. If your router is treating routes like a buffet, you want it choosing the most favorable dishes—EIGRP, of course! By grasping how this distance plays into network behaviors, you're setting yourself up for success as you prepare for your CCNA exam.

It’s almost poetic when you think about it. As you learn about EIGRP's administrative distance, reflect on the implications it holds for your network. A solid grip on how routing works can be a game changer, influencing everything from data flow to device reliability.

Now, here's the thing: while diving deep into routing protocols can feel dense, remember that the more you connect these dots, the clearer the picture becomes. So, keep your eye on that administrative distance of 90. It’s more than just a number—it’s your ticket to navigating the intricate world of networking effectively.