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Difficulty: EasyRouting Table Components

An administrator executes the command `show ip route` on a Cisco router and observes the following routing table entry:

`O 10.40.0.0/24 [110/50] via 172.16.1.2, 00:15:30, GigabitEthernet0/0`

Which component of the routing table entry is represented by the numerical value 50 inside the brackets?

  1. The metric (cost) of the route to the destination networkAnswer
  2. B
    The administrative distance of the OSPF protocol
  3. C
    The process ID assigned to the active routing process
  4. D
    The hop count limit remaining on packets matching this route

Answer

The numerical value 50 inside the brackets represents the metric (cost) of the route to the destination network.
In Cisco IOS routing tables, bracketed values following a destination network prefix use the standard format `[Administrative Distance / Metric]`. In the given output `[110/50]`, `110` is the default Administrative Distance for OSPF routes, and `50` is the calculated cost metric to reach network `10.40.0.0/24`.

Step-by-Step Solution

1
Identify the standard bracket notation in Cisco IPv4 routing table output.
The bracketed syntax is defined as `[Administrative Distance / Metric]`.
Cisco routers display the trustworthiness (AD) and path cost (metric) together inside square brackets immediately after the network prefix.
2
Parse the bracketed values `[110/50]` from the OSPF route entry.
The first number `110` is the OSPF Administrative Distance, and the second number `50` is the route metric.
Separating the position of each number identifies `50` as the metric/cost value calculated by OSPF.

Key Concept

Routing Table Components: Administrative Distance vs. Metric
Estimated Time:45s
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Topics

Routing Table Components

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