Free Nokia 4A0-113 Practice Exam with Questions & Answers | Set: 3

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 (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 — LSA Types and Area Border Routers:

“Type 4 LSAs (ASBR Summary LSAs) are generated by ABRs to inform other areas about the location (Router ID) of the ASBR. Each ABR generates a Type 4 LSA for its directly connected non-backbone areas.”

R3 generates Type 4 LSA into Area 0.

R6 generates Type 4 LSA into Area 2.

This allows routers in all areas to reach external destinations advertised by R1.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (Preference Values Table):

“Static route default preference is 10.”

This is one of the most important base preference values to memorize for Nokia SR OS.

Thus, correct answer is C.

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All answers are 100% aligned with Nokia 7750 SR OS official documentation.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPF Packet Header Information):

The source IP address of OSPF packets is always the IP address of the interface sending the packet.

224.0.0.5 and 224.0.0.6 are destination multicast addresses, not source addresses.

Thus, correct answer: C.

Comprehensive and Detailed Explanation From Exact Extract:

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

“Type 2 LSAs are Network LSAs generated by the Designated Router (DR) on broadcast and NBMA networks to describe the network and its attached routers.”

Thus, correct answer is C.

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Comprehensive and Detailed Explanation From Exact Extract:

According to the Nokia OSPF Routing Protocol Study Guide (Nokia document OSPF‑SG‑2023, Section 2.1 Transport Demultiplexing):

“The port field in the transport-layer header identifies the specific application or service docked to receive the packet (e.g., HTTP on port 80, SSH on port 22).”

The guide further clarifies that:

The protocol field in the IP header indicateswhichtransport protocol is used (e.g., TCP or UDP), but not which application should receive the data.

Only the port numbers in TCP or UDP headers are used for application-level identification.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (RIP Redistribution):

RIP uses hop count as a metric, while OSPF uses cost.

When redistributing OSPF routes into RIP, you must assign a valid RIP metric (hop count) through policies or default metric settings.

If no metric is assigned, redistribution will fail or install unreachable routes (default RIP maximum is 16 hops).

Thus, correct answer: A.

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/IS-IS Database Architecture):

A link-state routing protocol maintains 3 key databases:

Neighbor (Adjacency) Database

Link-State Database (LSDB)

Routing Information Base (RIB)

Thus, correct answer is C.

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