HPE Aruba Certified Network Security Expert (ACNSX) — Question 42

An administrator has an AOS-CX switch configured with:
router ospf 1
area 0
area 1 stub no-summary
It is the only ABR for area 1. The switch has the appropriate adjacencies to routing switches in areas 0 and 1. The current routes in each area are:
Area 0: 5 routes (LSA Type 1 and 2)
Area 1: 10 routes (LSA Type 1 and 2)
External routes: 2 (LSA Type 5)
Based on the above configuration, how many OSPF routes will routing switches see in Area 1?

Answer options

Correct answer: C

Explanation

The correct answer is C because in a stub area, the external routes (LSA Type 5) are not advertised, so routing switches in Area 1 will only see the internal routes from that area, which total 10, plus the routes from Area 0 that are summarized via the ABR, resulting in 11 total routes. The other options are incorrect because A counts external routes which are not included, B undercounts the routes, and D also miscounts the total routes available.