Free Practice Questions for Nokia 4A0-113 Exam

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:

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

“The router with the highest OSPF interface priority is elected DR.”

“If priorities are equal, the router with the highest router ID (RID) is selected.”

Thus:

B (Correct): Highest priority wins.

D (Correct): Highest RID used as tie-breaker.

Incorrect:

A: Lowest priority is incorrect.

C: Lowest RID is incorrect.

Correct answers: B, D.

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Comprehensive and Detailed Explanation From Exact Extract:

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

“The five OSPF packet types are: Hello, Database Description, Link State Request, Link State Update, Link State Acknowledgement.”

Thus, the correct list is:

Hello

Database Description

Link State Request

Link State Update

Link State Acknowledgement

Which corresponds to option D.

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.

Comprehensive and Detailed Explanation From Exact Extract:

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

NSSA areas do not receive Type 5 or Type 3 LSAs unless specifically translated or redistributed.

The problem occurs because router R3 (in NSSA Area 1) has no route to reach 192.168.3.1 unless a default route is injected.

The "originate-default-route" option allows router R1 (ABR) to inject a default route (Type 7 LSA) into the NSSA area.

Thus, correct answer: A.

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Comprehensive and Detailed Explanation From Exact Extract:

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

The correct command syntax on the Nokia 7750 SR is:

show router ospf neighbor

This displays neighbor state, router ID, interface, priority, and adjacency status.

Thus, correct answer: B.

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Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (OSPFv3 Prefix Advertisement):

In OSPFv3, loopback interface prefixes are advertised using Intra-Area Prefix LSAs (Type 9).

Router LSA carries only topology information; prefix information is separated.

Thus, correct answer: C.

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Comprehensive and Detailed Explanation From Exact Extract:

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

DR is responsible for generating Type 2 LSAs to describe the broadcast network.

BDR is only a standby and does not send LSAs unless promoted to DR.

DR/BDR election occurs regardless of the number of routers if the network type is broadcast.

Thus, correct answer: D.

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Comprehensive and Detailed Explanation From Exact Extract:

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

OSPFv3 fully supports NSSA functionality (same as OSPFv2).

OSPFv3 uses IPv6 Authentication Headers or IPsec instead of MD5.

Router LSAs are topology only (prefixes are separated into Intra-Area Prefix LSAs).

OSPFv3 continues to use a 32-bit router ID.

Thus, correct answer: C.

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Comprehensive and Detailed Explanation From Exact Extract:

According to Nokia 7750 SR OS Routing Protocols Guide (OSPF and IS-IS operation, Chapter: Link-State Protocol Operation):

B (Correct):

"Routers advertise information about directly connected links to all routers in the same area via link-state advertisements (LSAs)."

C (Correct):

"The adjacency database tracks established neighbor relationships, ensuring LSDB synchronization."

E (Correct):

"All routers within the same OSPF or IS-IS area have identical link-state databases after full synchronization."

Incorrect options:

A: Link-state protocols exchange only link-state information, not full routing tables (that’s distance-vector behavior).

D: Sequence numbers are incremented by the originator when generating LSAs, not by intermediate routers during flooding.

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