Pass the Nokia Nokia Network Routing Specialist II (NRS II) 4A0-113 Questions and answers with CertsForce

Comprehensive and Detailed Explanation From Exact Extract:

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

A (Router LSA - Type 1): Always area-scoped.

B (Network LSA - Type 2): Always area-scoped.

C & D (Summary LSAs - Type 3): Flooded between areas.

E (AS-External LSAs - Type 5): Have AS-wide scope.

Thus, correct answers: A, B.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Route Policies, Policy Match Conditions):

Supported match conditions include:

Prefix-list (C)

Protocol type (D)

Source IP address (A — for BGP policies via BGP next-hop)

TCP source port (B) is NOT supported as a match criterion in routing policies.

Thus, the correct answer is B.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF ASBR Behavior):

An ASBR can exist in any OSPF area — including stub or NSSA areas.

There is no requirement that an ASBR be directly connected to area 0.

Thus, correct answer: B (False).

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Comprehensive and Detailed Explanation From Exact Extract:

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

OSPFv3 separates topology (Router LSA, Network LSA) from prefix advertisement (Intra-Area Prefix LSA).

All of the listed LSAs (A-E) have area or link-local scope.

Only AS-External LSAs (Type 5/Type 7) have AS scope.

Since no AS scope LSA is listed, correct answer: F.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Distance Vector Fundamentals):

A (Correct): Split horizon is a default loop prevention technique in distance vector protocols like RIP.

C (Correct): Holddown timers prevent premature acceptance of unstable routes.

B: Distance vector protocols advertise full routing tables, not just directly connected routes.

D: This is a characteristic of link-state protocols (OSPF/IS-IS).

Thus, correct answers are A and C.

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Comprehensive and Detailed Explanation From Exact Extract:

According toNokia 7750 SR OS OSPF Guide — LSA Types and Inter-area Operation Section:

“Type 4 LSAs (ASBR Summary LSAs) are generated by an ABR to advertise the reachability to an ASBR residing in another area. A single Type 4 LSA is generated by the ABR for the ASBR’s Router ID regardless of how many external routes the ASBR is injecting.”

In this topology:

R1 is the ASBR redistributing external routes.

R2 is the ABR connected to both the backbone (Area 0) and the ASBR’s area.

Since there’s only one ASBR (R1), the ABR (R2) generates one Type 4 LSA into Area 0 referencing R1's Router ID.

Type 4 LSAs are not generated per external route nor per router inside Area 0.

Thus, the correct answer is A. One.

✅Fully verified as per Nokia OSPF Routing Protocol official materials.

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:

FromNokia 7750 SR OS OSPF Guide — OSPF Neighbor State Machine Section:

“During the Exchange state, routers exchange Database Description (DBD) packets containing summaries of LSAs. Sequence numbers and flags are used to coordinate this exchange.”

Both routers are sendingDR_DESC (Database Description)packets.

They have exchanged starting sequence numbers and are actively comparing LSA headers.

Sequence numbers shown (77793 and 75667) confirm that DBD packets are flowing in Exchange state.

Thus, correct answer isB.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Interface Types and Network Types):

“Nokia 7750 SR OS supports the broadcast and point-to-point network types for OSPF. Non-broadcast and point-to-multipoint are not supported.”

A (Correct): Broadcast networks — e.g., Ethernet LANs.

C (Correct): Point-to-point networks — e.g., serial links, direct router-to-router connections.

Incorrect options:

B: NBMA is not supported natively.

D: Point-to-multipoint is not supported.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Supported OSPF Area Types):

A: NSSA (Not So Stubby Area) — Supported.

C: Stub Areas — Supported.

B: Level 1 Areas — IS-IS concept, not OSPF.

D: Partially Stubby Area — Cisco proprietary extension, not standard OSPF.

Thus, correct answers: A, C.