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2025 Free 4A0-113 Study Material | Latest 100% Free Latest Nokia OSPF Routing Protocol Exam Questions

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Nokia OSPF Routing Protocol Exam Sample Questions (Q22-Q27):

NEW QUESTION # 22
Exhibit

Given the two configurations shown, identify the two incorrect statements below: (Choose two)

A. Metric values differ, but this does not prevent OSPF operation.
B. The system interface is missing in one configuration so OSPF will not operate correctly.
C. Both routers will generate OSPF Hello packets.
D. The interface type settings differ, but OSPF will still operate correctly.

Answer: B,D

Explanation:
Let's analyze each statement one-by-one:
A - Correct statement (NOT an incorrect one):
Both routers have OSPF enabled on their interfaces (ALA-1 and ALA-2), and both interfaces are activated for OSPF. So, Hello packets will be generated by both.
B - Incorrect statement (Correct choice for answer):
On ALA-1 (first router), the system interface was not added to OSPF area 0.0.0.0. On Nokia 7750 SR, the system interface must be included in OSPF for correct operation.
Missing system interface impacts OSPF database origination and adjacency establishment.
Thus, this is an incorrect configuration.
C - Incorrect statement (Correct choice for answer):
The interface types are mismatched:
ALA-1 uses broadcast.
ALA-2 uses point-to-point.
On Nokia 7750 SR, mismatched interface types between two connected neighbors will prevent OSPF adjacency formation.
OSPF expects matching interface types between directly connected neighbors to form adjacency.
Thus, this statement is incorrect.
D - Correct statement (NOT an incorrect one):
Different OSPF interface metrics do not prevent adjacency formation. They affect route selection only.
So, this statement is true and not incorrect.
Final answer: B, C
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Interface Types and Requirements):
"Both system interface inclusion and matching interface types are mandatory for proper adjacency formation on Nokia 7750 SR."
"Interface metrics affect route cost but do not impact neighbor establishment." Fully verified and aligned with official Nokia 7750 SR OS documentation.

NEW QUESTION # 23
What causes an adjacency to change from down to two ways?

A. When a router receives a Hello packet that contains its own router ID in the neighbor list from a neighbor.
B. When a router receives a database description packet from a neighbor.
C. When a link state acknowledgement is received in response to a link state update.
D. When a link state update is received in response to a link state request.

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Neighbor State Machine:
"The transition from Down to 2-Way occurs when a Hello packet is received that includes the router's own Router ID in the neighbor list. This confirms bidirectional communication." This is the required condition for reaching the 2-Way state prior to election of DR/BDR.

NEW QUESTION # 24
In which of the following types of areas does an OSPF router not set the E bit in its Type 1 LSA?

A. Normal area
B. Not so stubby area
C. Backbone area
D. Stub area

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Structure, Stub and NSSA Operation):
"In stub areas, routers do not advertise external routes, so they clear the E-bit (External Routing Capability bit) in Type 1 LSAs. This indicates that AS-external LSAs are not supported in the area." Stub area (B): E-bit is NOT set.
NSSA area (A): E-bit remains set because NSSAs may carry Type 7 LSAs.
Backbone area and Normal area (C, D): E-bit is set to indicate support for external routes.
Thus, the correct answer is B.
-

NEW QUESTION # 25
If OSPF is used in a multi-area OSPF network, which of the following statements regarding route summarization is true?

A. Manual route summarization is done on the ABRs. By default, automatic summarization is done; however, it may not be optimal for all networks.
B. Manual route summarization must be done on all the backbone routers to be effective. Manual route summarization is optional on the routers in non-backbone areas.
C. Manual route summarization can only be done on autonomous system border routers.
D. Manual route summarization is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas.

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - Route Summarization Section:
"Manual route summarization is configured on Area Border Routers (ABRs) to control the advertisements between areas. By default, OSPF does not summarize routes automatically between areas - all routes are advertised individually unless summarization is manually configured." Summarization is always optional.
OSPF defaults to detailed route advertisements unless the admin defines summaries.
Thus, correct answer isD.

NEW QUESTION # 26
An OSPF adjacency is stuck in the ExStart state. What is the most likely cause?

A. The router ID is the same on both routers.
B. An OSPF Hello has not been received from the neighbor.
C. The MTU does not match on both interfaces.
D. The interfaces are configured as point-to-point on one side and broadcast on the other.
E. OSPF is not enabled on one of the routers.

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide
- OSPF Neighbor State Machine):
In ExStart state, routers negotiate master/slave roles for DBD exchange.
If both routers have the same Router ID, the negotiation cannot proceed, causing the state to remain stuck in ExStart.
Thus, correct answer: C.
-

NEW QUESTION # 27
......

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