Cisco Certified Support Technician (CCST) NetworkingIP ConnectivityEasy
A network administrator is reviewing the routing table of a Cisco router and observes the following entry: 'O 10.0.0.0/8 [110/2] via 192.168.1.1, 00:00:30, GigabitEthernet0/0'. What does the value '110' represent in this routing table entry?
- AMetric
- BReliability
- CAdministrative Distance
- DHop Count
Show answer & explanationAnswer & explanation
Correct answer: C. Administrative Distance
In Cisco IOS routing table entries, the first value inside the square brackets represents the Administrative Distance (AD), which indicates the trustworthiness of the route source. For OSPF, the default AD is 110.
Why the other options are wrong
- A. The metric is the second value in the square brackets ('2' in this case) for OSPF, representing the cost.
- B. Reliability is a component of EIGRP's metric but not explicitly displayed this way for OSPF.
- D. Hop count is not directly displayed in this format for OSPF; it's more relevant for RIP.
Administrative Distance (AD)
Administrative Distance is a value used by routers to rate the trustworthiness of routing information received from different routing protocols or sources.
- Lower AD is preferred.
- Directly connected routes have AD 0, Static routes have AD 1.
- OSPF default AD is 110, EIGRP default AD is 90.
Memory trick: The brackets hold the trust and the cost.