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NEW QUESTION # 41
Click the exhibit button.

In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. Which of the following statements regarding the OSPF LSAs in the network is true?

• A. Router R1 generates a type 7 LSA that is flooded through all OSPF areas.
• B. Router R1 generates a type 5 LSA that is flooded through all OSPF areas.
• C. Router R1 generates a type 7 LSA that is flooded through area 1. Router R3 generates a type 5 LSA that is flooded through areas 0 and 2.
• D. Router R1 generates a type 5 LSA that is flooded through area 1. Router R2 generates a type 7 LSA that is flooded through areas 0 and 2.

Answer: C

NEW QUESTION # 42
Click the exhibit button.

If router R2 redistributes the IS-IS route to 192.168.3.0/24 into OSPF, router R3 will receive two routes to
192.168.3.0/24. What will be the preference of these two routes? Assume that all IS-IS routers are L1/L2 capable and are in the same area. Choose two answers.

• A. The IS-IS Level 2 external preference
• B. The IS-IS Level 1 internal preference
• C. The IS-IS Level 1 external preference
• D. The OSPF external preference
• E. The OSPF internal preference
• F. The IS-IS Level 2 internal preference

Answer: B,D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Default Route Preferences Table):
IS-IS Level 1 internal # preference 18 # very high preference.
OSPF external (Type 5) # preference 150 # much lower preference.
Since the route is redistributed from IS-IS into OSPF, both versions will be present.
Thus, correct answers: B, D.
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NEW QUESTION # 43
In which of the following types of areas does an OSPF router not set the E bit in its Type 1 LSA?

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

Answer: B

NEW QUESTION # 44
An OSPF ASBR must have at least one interface in the backbone area (area 0)

• A. True
• B. False

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF ASBR Behavior):
An ASBR can exist in any OSPF area - including stub or NSSA areas.
There is no requirement that an ASBR be directly connected to area 0.
Thus, correct answer: B (False).

NEW QUESTION # 45
Which of the following statements concerning OSPFv3 is false?

• A. Router LSAs do not carry IPv6 prefix information
• B. NSSA is not supported in OSPFv3.
• C. OSPFv3 uses a 32-bit router ID.
• D. MD5 Authentication is not supported.

Answer: B

NEW QUESTION # 46
Click the exhibit button.

The following command sequence is executed on router R2:
A: R2# configure router ospf router-id 10.10.10.99
A: R2# configure router router-id 10.10.10.66
On router R1, what router ID appears for router R2 directly after these commands are executed?

• A. 10.10.10.2
• B. 10.10.10.99
• C. 10.10.10.66
• D. 10.10.10.1

Answer: A

NEW QUESTION # 47
What modes of authentication are supported for RIPv2 on the Nokia 7750 SR?

• A. RIPv2 supports basic and MD5 authentication only.
• B. RIPv2 does not support authentication.
• C. RIPv2 does not support authentication, password and MD5 authentication.
• D. RIPv2 supports password and MD5 authentication only.

Answer: D

Explanation:
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.

NEW QUESTION # 48
Click the exhibit button.


The OSPF adjacency between routers R3 and R1 is down. What is the problem?

• A. Router R1 has the incorrect authentication key type.
• B. Router R3 has the incorrect authentication key type.
• C. Area 1 of router R1 should not be configured as a stub.
• D. There is not enough information to tell.

Answer: A

NEW QUESTION # 49
Click on the exhibit.

The route table on router R2 shows the system address of router R5 but it does not show any of the interfaces from the non-OSPF area.
What may be causing this?

• A. Router R1 needs to have an export policy added to it.
• B. Router R5 does not have an export policy for these prefixes.
• C. 'asbr' is missing from router R1's configuration.
• D. Router R1 needs to have an import policy added to it.

Answer: B

Explanation:
Detailed Analysis:
In this topology, router R5 is connected to a non-OSPF environment and must redistribute external routes into OSPF.
R5 is acting as an ASBR.
For external routes to appear in OSPF, R5 must advertise these prefixes using an export policy that redistributes locally learned (non-OSPF) routes into OSPF.
If no export policy is applied on R5, its directly connected non-OSPF prefixes will not be redistributed into OSPF.
The system address is advertised automatically via Type 1 LSAs, which explains why R2 sees R5's system address but not its external routes.
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Thus, correct answer:
C). Router R5 does not have an export policy for these prefixes.

NEW QUESTION # 50
What is the source IP address in an OSPF update?

• A. 224.0.0.5
• B. The system address of the router
• C. 224.0.0.6
• D. The unicast IP address of the interface the update is being sent on.

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Packet Headers):
"The source IP address in OSPF packets is always the IP address of the interface over which the packet is transmitted."
224.0.0.5 and 224.0.0.6 are destination multicast addresses, not source addresses.
Thus, correct answer: C.
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NEW QUESTION # 51
Which of the following statements regarding the election of the designated router (DR) by OSPF routers are true? (Choose two)

• A. If priorities are the same, the DR is chosen based on the highest RID.
• B. The router with the lowest priority is the DR.
• C. The router with the highest priority is the DR.
• D. If priorities are the same, the DR is chosen based on the lowest RID.

Answer: A,C

Explanation:
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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NEW QUESTION # 52
Which of the LSA types stay within an OSPF area and are not exported outside of the area? (Choose all that apply)

• A. Network LSA
• B. Summary Router LSA
• C. Router LSA
• D. Summary Network LSA

Answer: A,C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Types Summary):
A: Type 1 - Router LSA # Stays within the originating area.
B: Type 2 - Network LSA # Stays within the originating area.
C: Type 3 - Summary Network LSA # Flooded between areas by ABRs.
D: Type 3 - Summary Router LSA # Same as above.
Thus, correct answers: A, B.
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NEW QUESTION # 53
An OSPF router receives an update in which the sequence number, age, and checksum are the same as the entry already in the topological database. What action is taken by the router?

• A. The link state information is regarded as old and nothing is done.
• B. The link state information is not populated in the database and an acknowledgement is sent
• C. The link state information is not populated in the database but is forwarded to all neighbors
• D. The link state information already in the database is overwritten and the age is reset

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Processing Rules):
"When an LSA is received that matches the existing database copy exactly (same sequence number, age, and checksum), it is discarded, and an acknowledgment is sent to confirm receipt." Thus, correct answer is C.
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NEW QUESTION # 54
Click on the exhibit.

The route table on router R2 shows the system address of router R5 but it does not show any of the interfaces from the non-OSPF area.
What may be causing this?

• A. Router R1 needs to have an export policy added to it.
• B. Router R5 does not have an export policy for these prefixes.
• C. 'asbr' is missing from router R1's configuration.
• D. Router R1 needs to have an import policy added to it.

Answer: B

NEW QUESTION # 55
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. Both routers will generate OSPF Hello packets.
• C. The interface type settings differ, but OSPF will still operate correctly.
• D. The system interface is missing in one configuration so OSPF will not operate correctly.

Answer: C,D

NEW QUESTION # 56
What type of OSPF router generates a type 2 LSA?

• A. Area Border Router
• B. Designated Router
• C. All routers within an OSPF area.
• D. Autonomous System Boundary Router

Answer: B

NEW QUESTION # 57
Which of the following statements regarding area border routers in an OSPF network is true?

• A. The term backbone router has the same definition as the term area border router.
• B. By definition, an area border router must perform route summarization between areas.
• C. Area border routers connect the backbone area to other areas in an OSPF network.
• D. An OSPF network needs at least one area border router to function.

Answer: C

NEW QUESTION # 58
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The Nokia 4A0-113 exam covers a wide range of topics, including the fundamentals of OSPF, OSPF design and implementation, and troubleshooting OSPF networks. Candidates will be required to demonstrate their knowledge of configuring and monitoring OSPF networks, as well as their ability to troubleshoot common OSPF issues. The Nokia 4A0-113 certification exam is an excellent way for network professionals to enhance their skills and knowledge in OSPF routing protocol and gain recognition from the industry as experts in the field.

 

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