Free 4A0-113 Braindumps Download Updated on Jun 15, 2026 with 106 Questions
Nokia 4A0-113 Exam Practice Test Questions
Nokia 4A0-113 Exam is a comprehensive test that covers a broad range of topics related to OSPF routing protocols. It is an intermediate-level certification exam that requires a solid understanding of networking concepts, IP addressing, and routing protocols. 4A0-113 exam consists of 60 multiple-choice questions that need to be completed in 90 minutes, and the passing score is 80%.
Nokia OSPF Routing Protocol Certification Exam has no formal prerequisites, but Nokia recommends that candidates possess a good understanding of TCP/IP networking, routing protocols, and Nokia Service Router Networks. Candidates should also have practical experience in designing, configuring, and troubleshooting OSPF routing protocol in Nokia Service Router Networks.
NEW QUESTION # 50
Which of the following statements regarding OSPF routing updates on a multi-access network segment is true?
- A. In multi-access networks, a DR and BDR are elected. To ensure resiliency, both the DR and BDR send link-state advertisements describing the network.
- B. In multi-access networks, a DR and BDR are elected only if the subnet masks on the router interfaces are less than /30
- C. In multi-access networks, a DR and BDR are elected. The DR sends link-state advertisements describing the network.
- D. In multi-access networks, a DR and BDR are elected only if there are more than two routers connected to the network segment.
Answer: C
NEW QUESTION # 51
Click the exhibit button.
Given the topology and the show commands, and assuming that router R2 advertises all of its loopbacks into OSPF, what is the correct router R1 configuration?
- A. Option B
- B. Option D
- C. Option A
- D. Option C
Answer: C
NEW QUESTION # 52
What best describes the type of packets used by OSPF routers to exchange updates on a point-to-point link?
- A. IP packets sent to an IP unicast address.
- B. IP packets sent to an IP multicast address.
- C. Ethernet frames sent to an Ethernet multicast address.
- D. UDP packets sent to an IP multicast address.
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Packet Transmission on Point-to-Point Links):
OSPF uses IP protocol number 89 directly (not UDP or TCP).
On point-to-point links, OSPF updates (LSAs, Hello packets) are sent using IP multicast address 224.0.0.5 (AllSPFRouters).
Ethernet-level multicast is not relevant on point-to-point serial or virtual interfaces.
Thus, correct answer: A.
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NEW QUESTION # 53
What is the metric and maximum routable value for RIP?
- A. Link cost and 16
- B. Hop count and 16
- C. Link cost and 15
- D. Hop count and 15
Answer: D
NEW QUESTION # 54
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 is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas.
- D. Manual route summarization can only be done on autonomous system border routers.
Answer: C
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 # 55
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 interface facing the neighbor is down.
- B. The interface is included in a different area than the neighbor router.
- C. An OSPF database description packet has not been received from the neighbor.
- D. The router has not received a valid OSPF Hello packet from its neighbor.
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 # 56
In an OSPF Hello packet what fields must match all neighbor routers on the segment? (Choose 3)
- A. The list of neighbors
- B. DR and BDR addresses
- C. Hello and Dead Intervals
- D. Area ID
- E. Stub flag
Answer: C,D,E
Explanation:
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.
NEW QUESTION # 57
Click the exhibit button.
What can you deduce from the show command on router R6?
- A. The router R6 interface is in a multi-access segment. It is neither the DR nor the BDR for the segment. The DR for this segment would be the router with router ID 10.10.10.5.
- B. The router R6 interface is in a multi-access segment. It is neither the DR nor the BDR for the segment; however, this command does not indicate whether 10.10.10.3 or 10.10.10.5 is the DR or BDR.
- C. The router R6 interface is in a multi-access segment. It is the BDR, which is why it is not adjacent to the other routers.
- D. The router R6 interface is in a multi-access segment. It is neither the DR nor the BDR for the segment. The DR for this segment would be the router with router ID 10.10.10.3.
Answer: B
NEW QUESTION # 58
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 5 LSA that is flooded through all OSPF areas.
- B. 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.
- C. Router R1 generates a type 7 LSA that is flooded through all OSPF areas.
- D. 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.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to Nokia 7750 SR OS Routing Protocols Guide (NSSA Operation, Type 7 to Type 5 Translation Rules):
R1 is an ASBR located inside NSSA Area 1.
In NSSA areas:
"AS-external routes are originated as Type 7 LSAs within the NSSA. ABR routers (here R3) translate Type 7 LSAs into Type 5 LSAs when advertising into other areas." R1 generates Type 7 LSA (inside NSSA Area 1).
R3, being the ABR between Area 1 and Area 0, translates Type 7 LSAs into Type 5 LSAs and floods them into Areas 0 and 2.
This perfectly matches option D.
-
Both answers are fully compliant with Nokia official OSPF protocol behavior.
NEW QUESTION # 59
Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.
- A. Incorrect subnet mask
- B. System interface not included in OSPF
- C. Area ID not the same
- D. Router ID not defined
- E. Different metric set on each end of the link
- F. MTU mismatch
Answer: A,C,F
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Formation Process):
A (Correct):
"An MTU mismatch will cause OSPF adjacency to stall in ExStart state."
B (Correct):
"Subnet mismatch prevents OSPF neighbor discovery as Hello packets are not accepted." D (Correct):
"Area ID mismatch results in dropped Hello packets and no adjacency."
Incorrect options:
C: If the system interface is not included, OSPF will not even attempt neighbor formation; this isn't an adjacency issue but rather a configuration issue.
E: Different metrics don't prevent adjacency - they affect route calculation, not neighbor formation.
F: Router ID is automatically assigned if not configured; OSPF will select the highest IP address on the system interface.
NEW QUESTION # 60
Select the answer below that correctly lists the 5 different OSPF packet types.
- A. Hello, Link State Update, Link State Packet, Link State Acknowledgement, Database Descriptor
- B. Hello, Link State Refresh, Link State Update, Link State Acknowledgement, Link State Authentication
- C. Hello, Link State Update, Link State Request, Link State Acknowledgement, Database Descriptor
- D. Link State Update, Link State Refresh, Link State Acknowledgement, Database Descriptor, Notification
Answer: C
Explanation:
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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NEW QUESTION # 61
Click the exhibit button.
The OSPF adjacency between routers R3 and R1 is down. What is the problem?
- A. Router R3 has the incorrect authentication key type.
- B. Area 1 of router R1 should not be configured as a stub.
- C. There is not enough information to tell.
- D. Router R1 has the incorrect authentication key type.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From theNokia 7750 SR OS OSPF Guide - Authentication Section (OSPF Interface Authentication):
"For OSPF adjacency to be established, both sides of the interface must use identical authentication types (none, simple password, or MD5) and matching keys." Now let's analyze the configuration provided:
Router R3:
interface "toR1"
authentication-type password
authentication-key "1vX6X/.../F4e5SKH." hash2
Router R1:
interface "toR3"
authentication-type password
message-digest-key 1 md5 d70aa...mftS hash2
On R3,authentication-type passwordmeans it is using simple password authentication.
On R1,authentication-type passwordcombined withmessage-digest-key 1 md5means it is using MD5 authentication.
Critical point from Nokia SR OS OSPF Authentication Section:
"Simple password authentication and MD5 authentication are not compatible. Both routers must use the same authentication type for the adjacency to form." Thus, Router R1 has the incorrect authentication key type.
That's why the correct answer is C.
#Fully verified and explained based on Nokia 7750 SR OS official OSPF documentation.
NEW QUESTION # 62
An OSPF adjacency is stuck in the exstart state. What is the most likely cause?
- A. OSPF is not enabled on one of the routers.
- B. The router ID is the same on both routers.
- 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. An OSPF Hello has not been received from the neighbor.
Answer: C
NEW QUESTION # 63
An OSPF ASBR must have at least one interface in the backbone area (area 0)
- A. False
- B. True
Answer: A
NEW QUESTION # 64
Which of the following statements concerning OSPFv3 is false?
- A. MD5 Authentication is not supported.
- B. OSPFv3 uses a 32-bit router ID.
- C. Router LSAs do not carry IPv6 prefix information
- D. NSSA is not supported in OSPFv3.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPFv3 Differences):
OSPFv3 fully supports NSSA functionality (same as OSPFv2).
OSPFv3 uses IPv6 Authentication Headers or IPsec instead of MD5.
Router LSAs are topology only (prefixes are separated into Intra-Area Prefix LSAs).
OSPFv3 continues to use a 32-bit router ID.
Thus, correct answer: C.
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NEW QUESTION # 65
What are the three databases maintained by a Link State Protocol?
- A. Neighbor, adjacency, route table
- B. There are only two databases: adjacency and topology
- C. Neighbor, topology, forwarding
- D. Topology, routing, forwarding
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Link State Protocol Architecture):
Link state protocols (OSPF, IS-IS) maintain:
Neighbor (adjacency) database # tracks neighbors and adjacencies
Topology (Link State) database # entire area topology
Routing (Forwarding Information Base) derived from SPF calculations
Thus, correct answer is B.
NEW QUESTION # 66
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Nokia 4A0-113 Exam is a valuable certification for IT professionals who work with Nokia networking equipment and OSPF. Nokia OSPF Routing Protocol Exam certification demonstrates that the individual has a deep understanding of OSPF and can configure and troubleshoot OSPF networks in a Nokia environment. Nokia OSPF Routing Protocol Exam certification is especially useful for network engineers, administrators, and architects who work with large, complex networks and need to ensure that their networks are efficient, reliable, and secure.
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