4A0-113 Exam Dumps - Nokia OSPF Routing Protocol Exam

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Reliable Flooding and Acknowledgments):

“Every LSA transmitted by a router must be explicitly acknowledged by the receiving routers to ensure reliable flooding.”

LSAs use explicit acknowledgment via OSPF LSAck packets.

Without acknowledgment, retransmission occurs.

Thus, correct answer is A.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS CLI Guide (Static Route Configuration Syntax):

“Correct syntax: configure router static-route next-hop ”

Only option D uses the correct syntax and exact keyword structure.

Thus, correct answer is D.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Routing Protocol Classification):

RIPv1 (B) → Distance Vector

RIPv2 (C) → Distance Vector

OSPF (A) → Link-State

IS-IS (D) → Link-State

Thus, correct answers are B and C.

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All answers above are 100% verified and fully compliant with Nokia 7750 SR OS documentation.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Router ID Selection Rules):

The order of RID selection:

Manually configured RID via “config router ospf router-id” (D — Correct)

System IP address (E — Correct)

Highest interface IP address (F — Correct)

RID is not derived from MAC addresses.

Thus, correct answers: D, E, F.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor State Machine):

The ExStart state is where routers negotiate who will be the master during database exchange, based on router IDs.

If both routers have the same Router ID, the negotiation cannot proceed, causing the adjacency to be stuck in ExStart.

Thus, correct answer: C.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Route Policies):

“Export policies control what routes the router advertises to neighbors. Import policies control what routes the router accepts into its routing table from neighbors.”

The goal is to reject the OSPF route learned from R2.

Since R1 is receiving routes via OSPF, an IMPORT policy is required.

Currently, the policy is applied as export, which affects outbound advertisements only.

Thus, correct answer is C

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (RIP v2 Multicast Operation):

“RIPv2 uses multicast address 224.0.0.9 to send routing updates to adjacent RIP-enabled devices.”

224.0.0.5 → OSPF AllSPFRouters

224.0.0.6 → OSPF DR/BDR

224.0.0.10 → EIGRP

Thus, correct answer is C.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Formation):

For a neighbor to show up, the routers must first exchange Hello packets successfully.

Area ID mismatch (C), interface down (B), or no Hello received (D) are all valid reasons neighbors won't appear.

However, OSPF Database Description (DBD) packets are exchanged only after neighbor adjacency is established. If no neighbor is detected, the DBD packet exchange has not yet started.

Thus, correct answer: A.

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