NSE 7 — Enterprise Firewall — Question 17

Which statement about the designated router (DR) and backup designated router (BDR) in an OSPF multi-access network is true?

Answer options

• A. Only the DR receives link state information from non-DR routers.
• B. Non-DR and non-BDR routers form full adjacencies to DR only.
• C. FortiGate first checks the OSPF ID to elect a DR.
• D. Non-DR and non-BDR routers send link state updates and acknowledgements to 224.0.0.6.

Correct answer: D

Explanation

Option D is correct because in an OSPF multi-access network, non-DR and non-BDR routers send their link state updates and acknowledgments to the multicast address 224.0.0.6. Option A is incorrect as non-DR routers also send information to the BDR. Option B is wrong because non-DR and non-BDR routers do not form full adjacencies solely with the DR; they have a specific communication method. Option C is not relevant to the election process for DR, as the OSPF ID is just one factor among others.