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Difficulty: EasyRouting Table Components

A network administrator executes the show ip route command on a Cisco router and observes the following routing entry:

O 10.150.1.0/24 [110/20] via 192.168.12.2, 00:10:42, GigabitEthernet0/0

Which component of this routing table entry is represented by the value 110?

  1. The administrative distance of the routeAnswer
  2. B
    The metric (cost) to reach the destination network
  3. C
    The OSPF process ID configured on the router
  4. D
    The Autonomous System number of the routing protocol

Answer

The value 110 represents the administrative distance of the route.
In Cisco IOS routing tables, routes learned via dynamic protocols display bracketed values in the format [Administrative Distance / Metric]. The first number, 110, is the administrative distance, which indicates the reliability of the routing source (110 is the default AD for OSPF).

Step-by-Step Solution

1
Examine the bracketed notation [110/20] in the routing table entry.
Identify the standard Cisco routing table notation format [Administrative Distance / Metric].
Cisco IOS displays the administrative distance first, followed by the metric, enclosed in square brackets.
2
Correlate the first value (110) with its corresponding routing component.
110 is identified as the Administrative Distance (AD) for an OSPF-learned route.
Administrative distance measures the trustworthiness of a routing information source.

Key Concept

Routing Table Component Interpretation (Administrative Distance vs. Metric)
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Topics

Routing Table Components

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