The output of the show ip route command is given:
Router# show ip route
Gateway of last resort is 10.119.254.240 to network 10.140.0.0
O 172.16.0.0 [110/5] via 10.19.24.6, 0:01:00, Ethernet2
B 172.17.12.0 [200/128] via 10.19.24.24, 0:02:22, Ethernet2
O 172.71.13.0 [110/5] via 10.19.24.6, 0:00:59, Ethernet2
O 10.13.0.0 [110/5] via 10.19.24.6, 0:00:59, Ethernet2
What does the value 110 in the output represent?
A.
The administrative distance of the information source
B.
The metric to the route
C.
The type of route
D.
The port number of the remote router
Explanation:
The value 110 in the output represents the administrative distance (AD) of the information source.
Administrative distance is used by Cisco routers to select the most trustworthy source of routing information for
a particular route. Every routing protocol has a default administrative distance, and if more than one routing
protocol is providing route information about a route, the protocol with the lowest AD will be selected to populate
the routing table. The following table shows the AD values for different routing protocols:
The following is the sample output for the show ip route command:
Router# show ip route
Gateway of last resort is 10.119.254.240 to network 10.140.0.0
O 172.16.0.0 [110/5] via 10.19.24.6, 0:01:00, Ethernet2
B 172.17.12.0 [200/128] via 10.19.24.24, 0:02:22, Ethernet2
O 172.71.13.0 [110/5] via 10.19.24.6, 0:00:59, Ethernet2
O 10.13.0.0 [110/5] via 10.19.24.6, 0:00:59, Ethernet2
The following are the fields in the output:
O: Indicates that the route was discovered using Open Shortest Path First (OSPF).
B: Indicates that the route was discovered using Border Gateway Protocol (BGP).
172.16.0.0: Indicates the address of the remote network.
110: Indicates the administrative distance of the route.
128: Indicates the metric for the route.
Via 10.19.24.6: Specifies the address of the next router in the remote network.
0:02:22: Indicates the last time the route was updated.The metric for the route is also called the cost. In the case of the OSPF routes above, the cost is 5.
The administrative distance for any particular protocol can be changed if you would like to use a routing
protocol that is normally not the preferred provider. For example, if you prefer that RIP routes be installed in the
routing table rather than OSPF routes, you could change the administrative distance of RIP to a lower value
than OSPF (110), as shown below.
Router(config)# router rip
Router(config)# distance 100
All the other options are incorrect because they do not represent the administrative distance.
Objective:
Routing Fundamentals
Sub-Objective:
Interpret the components of routing tableCisco > Support > IP > IP Routing > Design > Design TechNotes > What Is Administrative Distance? >
Document ID: 15986
