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

Comprehensive and Detailed Explanation From Exact Extract:

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

“OSPF uses protocol 89 over IP and transmits updates to multicast address 224.0.0.5 (AllSPFRouters) on point-to-point and broadcast links.”

No TCP or UDP used.

Pure IP protocol with protocol number 89.

Multicast address 224.0.0.5 is used for neighbor discovery and update transmission.

Thus, correct answer isA.

Comprehensive and Detailed Explanation From Exact Extract:

From Nokia 7750 SR OS Routing Protocols Guide (RIP Route Export Configuration):

“RIP on the Nokia 7750 SR does not automatically advertise locally attached routes. A route policy must be used to export locally learned routes into RIP.”

Route policies control what routes are exported from the local routing table into RIP advertisements.

No access-list or neighbor configuration is required for this.

Thus, correct answer is A.

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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 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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