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Difficulty: EasyRouting Concepts and Dynamic Routing Protocols

When a router receives route advertisements from different sources for the exact same destination network, it evaluates their trustworthiness using Administrative Distance (AD). How should the following route sources be ordered from the lowest administrative distance (most trustworthy) to the highest administrative distance (least trustworthy)?

  1. 1Directly connected interface
  2. 2Static route
  3. 3OSPF dynamic route
  4. 4RIP dynamic route

Answer

The correct sequence from lowest to highest Administrative Distance is: Directly connected interface (AD = 00), Static route (AD = 11), OSPF dynamic route (AD = 110110), and RIP dynamic route (AD = 120120).
Administrative Distance (AD) is a feature used by routers to select the best path when there are two or more different routes to the same destination from different routing protocols. The default AD values in increasing order are: Directly connected interfaces (00), Static routes (11), OSPF (110110), and RIP (120120).

Step-by-Step Solution

1
Identify the Administrative Distance (AD) value for each route source
Directly connected interface = 00, Static route = 11, OSPF = 110110, RIP = 120120.
Administrative distance measures route reliability on a scale from 00 to 255255, where lower values are preferred.
2
Arrange the sources in ascending numeric order of their AD values
00 (Directly connected) < 11 (Static) < 110110 (OSPF) < 120120 (RIP).
Lower AD values indicate higher trust and are selected first by the router.

Key Concept

Administrative Distance Hierarchy
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Topics

Routing Concepts and Dynamic Routing Protocols

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