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Difficulty: MediumRouting Table Components

An administrator reviews the routing table of a Cisco router and observes the following specific route entry:

text
O 172.31.50.0/26 [110/65] via 10.1.1.2, 00:04:12, GigabitEthernet0/1

Which two statements correctly interpret the components of this routing entry? (Select two.)

  1. The administrative distance of this route is 110, identifying OSPF as the routing protocol source.Answer
  2. The metric value for reaching the destination network via this path is 65.Answer
  3. C
    The administrative distance of this route is 65, which takes priority over routes with an administrative distance of 110.
  4. D
    The IP address 172.31.50.0/26 represents the next-hop IP address to which packets are forwarded.

Answer

The statement identifying the administrative distance as 110 (indicating OSPF) and the statement identifying the metric value as 65 are correct.
In Cisco IOS routing tables, a route entry displays the route source code ('O' for OSPF), destination subnet prefix, and bracketed values [Administrative Distance / Metric]. For the route entry provided, 110 is the Administrative Distance and 65 is the OSPF route metric. The egress interface is GigabitEthernet0/1, and 10.1.1.2 is the next-hop router IP address.

Step-by-Step Solution

1
Analyze the prefix code prefixing the routing entry.
The code 'O' indicates the route was dynamically learned through Open Shortest Path First (OSPF).
Routing codes at the beginning of an entry indicate the source protocol.
2
Examine the bracketed numbers [110/65].
The structure is formatted as [Administrative Distance / Metric]. Therefore, AD = 110 and Metric = 65.
Cisco IOS routing entries consistently format believable path trustworthiness (AD) first and protocol metric second.
3
Identify destination subnet and forwarding descriptors.
172.31.50.0/26 is the target subnet, 10.1.1.2 is the next-hop IP address, and GigabitEthernet0/1 is the egress interface.
The 'via' keyword introduces the next-hop IP address for remote networks.

Key Concept

Routing Table Components
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Topics

Routing Table Components

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