JN0-102 · Question #19
In the exhibit, there are four static routes that route traffic through different interfaces. user@router> show route protocol static inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0…
The correct answer is D. ge-0/0/4. Routers use the longest prefix match to determine the most specific route for a given destination IP address. For 99.0.0.1, the /26 prefix is the most specific match among the available routes, directing traffic to ge-0/0/4.
Question
In the exhibit, there are four static routes that route traffic through different interfaces. user@router> show route protocol static inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 99.0.0.0/17 *[Static/5] 00:00:11 >to 10.1.1.2 via ge-0/0/1.0 99.0.0.0/19 *[Static/5] 00:00:11 >to 10.1.2.2 via ge-0/0/2.0 99.0.0.0/24 *[Static/5] 00:00:11 >to 10.1.3.2 via ge-0/0/3.0 99.0.0.0/26 *[Static/5] 00:00:11 >to 10.1.4.2 via ge-0/0/4.0 Which interface does the router use if traffic is sent to the 99.0.0.1 destination?
Options
- Age-0/0/1
- Bge-0/0/2
- Cge-0/0/3
- Dge-0/0/4
How the community answered
(37 responses)- A3% (1)
- B16% (6)
- C8% (3)
- D73% (27)
Why each option
Routers use the longest prefix match to determine the most specific route for a given destination IP address. For 99.0.0.1, the /26 prefix is the most specific match among the available routes, directing traffic to ge-0/0/4.
The 99.0.0.0/17 route is less specific than /26, so it would not be chosen.
The 99.0.0.0/19 route is less specific than /26, so it would not be chosen.
The 99.0.0.0/24 route is less specific than /26, so it would not be chosen.
The router follows the longest prefix match rule. For the destination 99.0.0.1, all listed routes match. However, the 99.0.0.0/26 route (which covers 99.0.0.0 to 99.0.0.63) has the longest prefix (most specific subnet mask), making it the preferred route.
Concept tested: Longest prefix match routing
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_fnd/configuration/xe-3s/iri-xe-3s-book/iri-cfg-route-fnd.html
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