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

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 (OSPF Database Exchange Logic):

If a router detects that its database contains a newer copy of an LSA than what its neighbor has advertised (lower sequence number seen in DBD packet), it sends a Link State Update containing the newer LSA back to its neighbor.

Thus, correct answer: A.

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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 (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 (RIP Authentication):

“RIPv2 supports plain text (password) and MD5 authentication.”

Thus, correct answer is B.

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All answers are 100% verified against official Nokia 7750 SR OS 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:

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 Packet Types Summary):

The 5 OSPF packet types are:

Hello

Database Description (DBD)

Link State Request (LSR)

Link State Update (LSU)

Link State Acknowledgment (LSAck)

Thus, correct answer: D.

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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 (OSPF ASBR Summary LSA):

Type 4 LSAs (ASBR Summary LSAs) are originated by ABRs.

They inform routers in other areas about how to reach the ASBR (not about external prefixes, but about the ASBR's router ID).

Thus, correct answer: A.

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