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 Hello Packet Processing):

“For adjacency formation, the following fields must match: Area ID, Hello Interval, Dead Interval, and Options (which includes the Stub flag).”

DR/BDR addresses (D) and neighbor lists (E) do not have to match for adjacency establishment.

Thus, correct answers are A, B, C.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPFv3 LSA Types):

OSPFv3 uses Inter-Area Prefix LSAs (Type 3) to advertise prefixes between areas.

R4 originates a Router LSA with its local prefixes into Area 0.

R1, as the ABR between Area 0 and Area 1, generates an Inter-Area Prefix LSA (Type 3) for R4's prefix and floods it into Area 1, where R5 receives it.

Thus, correct answer: D.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Route Preferences – Default Administrative Distances):

IS-IS Level 1 internal preference: 18

OSPF external (Type 5) preference: 150

R3 will have both routes:

B (Correct): IS-IS Level 1 internal route received directly from IS-IS (lower preference value 18).

D (Correct): OSPF external route received via redistribution (higher preference value 150).

Since IS-IS internal has better preference, it will be installed, but both exist as valid route types.

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Comprehensive and Detailed Explanation From Exact Extract:

FromNokia 7750 SR OS OSPF Guide — OSPF Packet Transmission Section:

“OSPF uses protocol 89 over IP and transmits updates to multicast address 224.0.0.5 (AllSPFRouters) on point-to-point and broadcast links.”

No TCP or UDP used.

Pure IP protocol with protocol number 89.

Multicast address 224.0.0.5 is used for neighbor discovery and update transmission.

Thus, correct answer isA.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS High Availability Guide (Non-Stop Routing Behavior):

A (Correct): Nokia NSR does not require protocol extensions; it operates entirely within the router.

C (Correct): NSR is fully transparent to neighboring routers.

B: NSR is supported by OSPF, IS-IS, and BGP — not limited to OSPF/IS-IS only.

D: Graceful Restart is a separate protocol mechanism, not required for Nokia NSR internal operation.

Thus, correct answers: A, C.

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Comprehensive and Detailed Explanation From Exact Extract:

FromNokia 7750 SR OS OSPF Guide — Area Types Section:

“The 7750 SR supports standard areas, stub areas, and not-so-stubby areas (NSSA).”

NSSA (Not-So-Stubby Areas) are supported.

Stub Areas are supported.

Terms like Level 1, Level 2, or WC do not apply to OSPF but rather to IS-IS.

Thus, the correct answers are A and C.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF DR/BDR Election):

“By default, OSPF interfaces on Nokia 7750 SR have a priority value of 1 for DR election.”

A priority of 0 means the router is ineligible to become DR/BDR.

255 is the highest configurable value (not default).

Thus, correct answer is B.