Nokia Updated 4A0-113 Exam Questions and Answers by zephyr

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF and IS-IS LSA Aging Rules):

A (Correct): OSPF starts LSAs with age 0, IS-IS starts with age 1200 seconds.

C (Correct): LSA/LSP age is incremented both during database retention and while being flooded.

Thus, correct answers are A and C.

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:

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 Routing Protocols Guide (Router ID Selection):

“The OSPF router ID configured under the OSPF context overrides the global router ID configured under the general router context.”

Since "configure router ospf router-id 10.10.10.99" was applied, this takes precedence for OSPF operation, even though "configure router router-id 10.10.10.66" was configured globally.

Thus, router R1 will see router R2’s OSPF router ID as 10.10.10.99.

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