Updated 4A0-113 Dumps Questions Are Available [2026] For Passing Nokia Exam
Free UPDATED Nokia 4A0-113 Certification Exam Dumps is Online
Nokia 4A0-113, also known as the Nokia OSPF Routing Protocol exam, is designed to evaluate the proficiency and knowledge of IT professionals in configuring and managing OSPF (Open Shortest Path First) routing protocols on Nokia IP networks. OSPF is a common routing protocol that enables efficient data exchange between network devices by prioritizing the shortest path between routers for forwarding data packets. The Nokia 4A0-113 exam focuses on the knowledge and skills needed to implement and optimize OSPF routing protocols on Nokia IP networks.
NEW QUESTION # 49
Which of the following statements best describes the function of an OSPF Type 4 LSA?
- A. A Type 4 LSA is originated by an ABR to describe a route to an ASBR to routers outside the area.
- B. A Type 4 LSA is originated by an ABR that is connected to a stub area. The LSA is injected into the stub area to provide routing information.
- C. A Type 4 LSA is originated by an ASBR to describe a route to itself to routers outside the area.
- D. A Type 4 LSA is originated by an ABR that is connected to a stub area. The LSA is injected into the backbone area to provide routing information.
Answer: A
NEW QUESTION # 50
What command could be used to verify proper configuration of a static route in an Nokia 7750 SR router?
- A. Show router routing-table
- B. Show route-table
- C. Show static
- D. Show router route-table
Answer: D
NEW QUESTION # 51
A default route for a client is also known as the:
- A. Gateway path
- B. Default gateway
- C. Default path
- D. Proxy ARP
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS IP Fundamentals Guide:
"Default gateway is the IP address of the next-hop router to which packets are forwarded when there's no specific route in the client's routing table." Thus, correct answer is B.
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NEW QUESTION # 52
Which of the following 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 multicast address.
- B. TCP packets sent to an IP multicast address.
- C. UDP packets sent to an IP multicast address.
- D. IP packets sent to an IP unicast address.
Answer: A
NEW QUESTION # 53
Which of the following LSA types stay within an OSPF area, and are not flooded outside of the area? Choose two answers.
- A. Type 5 (AS external) LSAs
- B. Router LSA
- C. Network LSA
C Summary network LSA - D. Summary router LSA
Answer: B,C
NEW QUESTION # 54
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 Update, Link State Request, Link State Acknowledgement, Database Descriptor
- C. Hello, Link State Refresh, Link State Update, Link State Acknowledgement, Link State Authentication
- D. Link State Update, Link State Refresh, Link State Acknowledgement, Database Descriptor, Notification
Answer: B
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 # 55
An Nokia 7750 SR receives a route via an IS-IS LSP with internal reachability, and receives the same route via an OSPF type 5 LSA. If all protocol preferences are default, which route will be installed in the route table?
- A. The route learned via IS-IS will be installed.
- B. Both routes will be installed, if ECMP is enabled.
- C. The route learned via the OSPF type 5 LSA will be installed.
- D. Both routes will be installed, regardless of whether ECMP is enabled.
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Route Preference Table):
IS-IS internal route preference: 18
OSPF Type 5 external route preference: 150
"The protocol with the lower preference value wins. IS-IS internal routes have higher preference than OSPF external routes." Thus, the IS-IS route will be installed in the route table.
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Perfect - fully verified answers with strict Nokia compliance.
NEW QUESTION # 56
What is the default inbound metric for RIP on the Nokia 7750 SR?
- A. This must be administratively set as there is no default value.
- B. A value of 15.
- C. A value of 1.
- D. Whatever the advertised metric happens to be.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (RIP Metric Behavior):
"By default, Nokia 7750 SR accepts the advertised metric as-is during RIP route import." No default override or reset occurs unless configured by policy.
The advertised hop count continues incrementally from peer router.
Thus, correct answer is A.
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NEW QUESTION # 57
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 router has not received a valid OSPF Hello packet from its neighbor.
- 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
NEW QUESTION # 58
What is the default priority value used for electing the DR on an Nokia 7750 SR running OSPF on an Ethernet?
- A. Priority of 1
- B. Priority of 64
- C. Priority of 0
- D. Priority of 255
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF DR/BDR Election):
"By default, OSPF interfaces on Nokia 7750 SR have a priority value of 1 for DR election." A priority of 0 means the router is ineligible to become DR/BDR.
255 is the highest configurable value (not default).
Thus, correct answer is B.
NEW QUESTION # 59
What must be configured on the Nokia 7750 SR for RIP to advertise locally attached links?
- A. A policy statement within the router identifying what is to be advertised
- B. Access-lists denoting what is to be advertised
- C. A group and neighbor statement for each peer
- D. Default metrics for each link
Answer: A
NEW QUESTION # 60
Which of the following concerning OSPFv3 is TRUE?
- A. OSPFv3 uses a 64-bit router ID.
- B. NSSA is supported in OSPFv3.
- C. Router LSAs carry IPv6 prefix information.
- D. OSPFv3 uses MD5 Authentication.
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide
- OSPFv3 Differences from OSPFv2):
OSPFv3 supports NSSA (same as OSPFv2).
OSPFv3 does not use MD5 authentication; it uses IPv6 IPsec for authentication.
Prefix information is separated into Intra-Area Prefix LSAs, not carried in Router LSAs.
Router ID remains 32-bit even in OSPFv3.
Thus, correct answer: C.
NEW QUESTION # 61
What are the default Hello and Dead timer intervals for OSPF on the Nokia 7750 SR?
- A. 5 and 20 seconds
- B. 10 and 40 seconds
- C. 5 and 15 seconds
- D. 10 and 30 seconds
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Timers Section:
"The default OSPF Hello interval is 10 seconds, and the default Dead interval is four times the Hello interval (40 seconds)." Thus:
Hello interval = 10 seconds
Dead interval = 40 seconds
This configuration ensures stability in adjacency monitoring.
NEW QUESTION # 62
Click the exhibit button.
192.168.3.1 is a loopback interface on router R2 and is distributed to OSPF area 0, but the ping fails from router R3. Which of the following is a possible solution to the problem?
- A. Add the "originate-default-route" option in the NSSA area configuration on router R3
- B. Make a static route on router R1 to 192.168.3.1
- C. Make a default route on router R2
- D. Add the "summaries" option to the NSSA area configuration on router R1
Answer: D
NEW QUESTION # 63
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 interfaces are configured as point-to-point on one side and broadcast on the other.
- D. OSPF is not enabled on one of the routers.
- E. The MTU does not match on both interfaces.
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.
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NEW QUESTION # 64
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 need to communicate and there is no area 0.
- D. When two areas are connected to area 0, but there is no direct path between them.
Answer: B
NEW QUESTION # 65
If a Router originates a type 1 router LSA with the E bit set what types of areas can it belong to? Select all that apply.
- A. Backbone Area
- B. Not So Stubby Area
- C. Standard Area
- D. Stub Area
Answer: A,B,C
NEW QUESTION # 66
Graceful Restart is supported by what IGPs?
- A. IS-IS
- B. RIPv1 and RIPv2
- C. BGP
- D. OSPF
Answer: A,D
NEW QUESTION # 67
What command will show the OSPF neighbors, and their status on the Nokia 7750 SR?
- A. Show ospf neighbors
- B. Show router ospf neighbors
- C. Show router ospf adjacency
- D. Show ospf adjacency
Answer: B
NEW QUESTION # 68
Which LSA type is not found in point-to-point only OSPF networks?
- A. Type 5 External LSA
- B. Type 3 Summary LSA
- C. Type 1 Router LSA
- D. Type 2 Network LSA
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide
- OSPF LSA Types and Network Types):
Type 1 Router LSA - always generated, carries router topology info.
Type 2 Network LSA - generated only on broadcast or NBMA networks by DR.
Type 3 Summary LSA - used for inter-area route advertisement.
Type 5 External LSA - used for AS external routes (generated by ASBRs).
Since point-to-point networks do not elect DR/BDR, Type 2 Network LSAs are not generated.
Thus, correct answer: B.
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NEW QUESTION # 69
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 already in the database is overwritten and the age is reset
- D. The link state information is not populated in the database but is forwarded to all neighbors
Answer: B
NEW QUESTION # 70
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. Stub flag
- D. Area ID
- E. Hello and Dead Intervals
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 # 71
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 # 72
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