FCSS-NST-SE-7-6: Fortinet NSE 6 - Network Security 7.6 Support EngineerDemo

By Fortinet · Question Mode

QuestionQ21

Authentication

Refer to the exhibits.

Network topology —

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OSPF database —

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FGT-1 is an area border router (ABR) with interfaces in OSPF areas 0.0.0.0 and 0.0.0.5. FGT-3 operates as an autonomous system border router (ASBR), importing static routes into OSPF. FGT-2 is an internal router, with all of its interfaces in area 0.0.0.5. FGT-1 is receiving every route advertised by FGT-2; however, FGT-3 is not receiving any routes advertised by FGT-1.

What is the most likely cause?

  • A Area 0.0.0.5 is configured not to propagate type 5 LSAs.
  • B FGT-2 is configured with a distribution list to block all advertised routes from FGT-3.
  • C FGT-3 and FGT-2 have not formed an OSPF adjacency yet.
  • D IP protocol 89 is blocked between FGT-1 and FGT-3.
Explanation

A stub area does not accept type 5 external LSAs, but that restriction applies to advertisements entering area 0.0.0.5 and does not prevent FGT-1 from advertising routes to FGT-3 across area 0.0.0.0. OSPF uses IP protocol 89 for neighbor communication and LSA exchange; blocking that protocol between FGT-1 and FGT-3 prevents FGT-3 from receiving FGT-1’s OSPF advertisements.

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