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Nokia OSPF Routing Protocol Exam Sample Questions (Q47-Q52):

NEW QUESTION # 47
When are virtual links used in OSPF?

A. When an area needs to connect directly to another area without using area 0.
B. When an area needs to traverse another area to reach area 0.
C. When two areas are connected to area 0, but there is no direct path between them.
D. When two areas need to communicate and there is no area 0.

Answer: B

NEW QUESTION # 48
Which of the following are similarities between OSPF and IS-IS? Choose two answers.

A. Link state updates sent using layer 3 multicast.
B. Support for CIDR.
C. Slow convergence after link failures.
D. Support hierarchy through the use of areas.
E. Metric is based on hop count.

Answer: B,D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF vs. IS-IS Comparison):
C (Correct):
"Both OSPF and IS-IS support hierarchical design through the use of areas (OSPF Area 0 backbone; IS-IS Level 1/Level 2 hierarchy)." D (Correct):
"Both protocols support variable length subnet masks (VLSM) and Classless Inter-Domain Routing (CIDR)." Incorrect options:
A: Both use cost-based metrics, not hop count.
B: Both protocols converge quickly (they are link-state protocols).
E: IS-IS uses Layer 2 (CLNS) for communication, not Layer 3 multicast.
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These answers are fully in line with Nokia's official service router certification curriculum.

NEW QUESTION # 49
Click the exhibit button.

What triggers convergence of the routing protocol when the link between switch 1 and switch 2 goes down?

A. Convergence is triggered when the switches notify the routers about the link state information. At this point, both routers R1 and R2 re-compute their link state database and send updates to their adjacent routers. Once the process is complete for all routers, the networks have converged
B. Convergence is triggered when the physical interfaces between routers R1 and R2 go down. At this point, both routers R1 and R2 re-compute their link state database and send updates to their adjacent routers. Once the process is complete for all routers, the networks have converged.
C. Convergence is triggered when the adjacency between routers R1 and R2 drops as a result of Hello timeouts. At this point, both routers R1 and R2 re-compute their link state database and send updates to their adjacent routers. Once the process is complete for all routers, the networks have converged.
D. Convergence is triggered when an LSA is sent from router R1 to router R2 to indicate that the link is down. At this point, both routers R1 and R2 re-compute their link state database and send updates to their adjacent routers. Once the process is complete for all routers, the networks have converged.
E. Convergence will not be triggered because switches cannot run routing protocols between them.

Answer: C

NEW QUESTION # 50
Exhibit

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

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

Answer: A,C

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 # 51
An interface is configured on a router for OSPF but the command "show router ospf neighbor" does not show any neighbors. Which of the following is NOT a possible cause?

A. The router has not received a valid OSPF Hello packet from its neighbor.
B. The interface facing the neighbor is down.
C. An OSPF database description packet has not been received from the neighbor.
D. The interface is included in a different area than the neighbor router.

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Formation):
For a neighbor to show up, the routers must first exchange Hello packets successfully.
Area ID mismatch (C), interface down (B), or no Hello received (D) are all valid reasons neighbors won't appear.
However, OSPF Database Description (DBD) packets are exchanged only after neighbor adjacency is established. If no neighbor is detected, the DBD packet exchange has not yet started.
Thus, correct answer: A.

NEW QUESTION # 52
......

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