PCNSE · Question #651
The same route appears in the routing table three times using three different protocols. Which mechanism determines how the firewall chooses which route to use?
The correct answer is A. Administrative distance. When the same destination prefix is learned via multiple routing protocols simultaneously, administrative distance (AD) determines which route is installed in the active routing table. AD represents the trustworthiness of the routing source - lower values are preferred. For…
Question
The same route appears in the routing table three times using three different protocols. Which mechanism determines how the firewall chooses which route to use?
Options
- AAdministrative distance
- BMetric
- COrder in the routing table
- DRound Robin load balancing
How the community answered
(36 responses)- A89% (32)
- B3% (1)
- C3% (1)
- D6% (2)
Explanation
When the same destination prefix is learned via multiple routing protocols simultaneously, administrative distance (AD) determines which route is installed in the active routing table. AD represents the trustworthiness of the routing source - lower values are preferred. For example, OSPF (AD 110) is preferred over RIP (AD 120). Metric only compares routes within the same protocol. Order in the routing table and round-robin are not valid route selection mechanisms in this context.
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