Latest [Dec 20, 2025] 100% Passing Guarantee - Brilliant 4A0-113 Exam Questions PDF
4A0-113 Certification – Valid Exam Dumps Questions Study Guide! (Updated 106 Questions)
Nokia 4A0-113 certification exam is a challenging but rewarding experience for network engineers looking to demonstrate their expertise in the OSPF routing protocol. With a deep understanding of OSPF, individuals can design and implement complex networks that are efficient, reliable, and scalable.
By earning the Nokia 4A0-113 certification, network professionals can demonstrate their proficiency in designing, implementing, and managing complex network infrastructures using Nokia OSPF Routing Protocol. Nokia OSPF Routing Protocol Exam certification can help network professionals to advance their careers and gain recognition for their expertise in the networking industry. Additionally, it can help organizations to identify and hire skilled network professionals who can effectively manage and maintain their network infrastructures.
NEW QUESTION # 18
What modes of authentication are supported for RIPv2 on the Nokia 7750 SR?
- A. RIPv2 does not support authentication, password and MD5 authentication.
- B. RIPv2 supports basic and MD5 authentication only.
- C. RIPv2 does not support 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 # 19
Click the exhibit button.
What is the command to configure a static route on the Nokia 7750 SR router R1 to reach the network behind router R2?
- A. configure router static-route 138.120.199.2/24 next-hop 138.120.199.1
- B. configure router static-route 139.120.121.0/24 next-hop 138.120.199.1
- C. configure router static-route 139.120.121.0/24 next-hop 139.120.121.2
- D. configure router static-route 139.120.121.0/24 next-hop 138.120.199.2
Answer: D
NEW QUESTION # 20
How many databases does a Link State routing protocol use?
- A. One
- B. Three
- C. Four
- D. Two
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF/IS-IS Database Architecture):
A link-state routing protocol maintains 3 key databases:
Neighbor (Adjacency) Database
Link-State Database (LSDB)
Routing Information Base (RIB)
Thus, correct answer is C.
NEW QUESTION # 21
In an OSPF environment, what must a router receive after it sends out an update?
- A. The router must receive an acknowledgment
- B. The router must receive a Link State Packet
- C. The router must receive a new sequence number
- D. The router must receive a Hello
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Reliable Flooding and Acknowledgments):
"Every LSA transmitted by a router must be explicitly acknowledged by the receiving routers to ensure reliable flooding." LSAs use explicit acknowledgment via OSPF LSAck packets.
Without acknowledgment, retransmission occurs.
Thus, correct answer is A.
NEW QUESTION # 22
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 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.
- 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 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.
- D. Convergence will not be triggered because switches cannot run routing protocols between them.
- E. 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.
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Operation - Adjacency and Link Failures):
"If connectivity is lost (e.g. link failure between switches), OSPF adjacencies between routers timeout due to absence of Hello packets. When adjacency is lost, LSDB recalculation and LSA flooding occur to inform all routers of the new topology." The physical interface may remain up (because directly connected interfaces to switches remain electrically active), but no Hello packets are exchanged # triggers adjacency loss # triggers convergence.
LSAs are not sent between routers to notify about link failures directly - they are generated after adjacency loss.
Thus, option A is fully correct.
NEW QUESTION # 23
In an IP datagram, which field identifies the receiving application
- A. The protocol field of the transport layer header
- B. The port field of the transport layer header
- C. The protocol field of the network layer header
- D. The port field of the network layer address
Answer: B
NEW QUESTION # 24
What are the default Hello and Dead timer intervals for OSPF on the Nokia 7750 SR?
- A. 10 and 30 seconds
- B. 10 and 40 seconds
- C. 5 and 15 seconds
- D. 5 and 20 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 # 25
Click the exhibit button.
In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. How many type 4 LSAs will be present in the network?
- A. One for each of the routers in area 0
- B. Type 4 LSAs are not generated in this network topology.
- C. One.
- D. One for each of the external routes exported by router R1.
Answer: B
NEW QUESTION # 26
A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.
What action does the router take?
- A. The router sends a link-state acknowledgement to its neighbor.
- B. The router updates the information in its LSDB with the information received from its neighbor.
- C. The router sends a link-state update to its neighbor.
- D. The router sends a link-state request to its neighbor.
- E. The router takes no action.
Answer: C
NEW QUESTION # 27
The Nokia 7750 SR supports which two of the OSPF area types below?
- A. Stub Areas
- B. Partially Stubby Areas
- C. Not So Stubby Areas
- D. Level 1 Areas
Answer: A,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Supported OSPF Area Types):
A: NSSA (Not So Stubby Area) - Supported.
C: Stub Areas - Supported.
B: Level 1 Areas - IS-IS concept, not OSPF.
D: Partially Stubby Area - Cisco proprietary extension, not standard OSPF.
Thus, correct answers: A, C.
NEW QUESTION # 28
Which of the following statements apply to link state protocol behavior? Choose three answers.
- A. The sequence number for an update is incremented as it is flooded from router to router.
- B. The topological database is the same for all routers in a single area.
- C. Information about directly connected links is sent to all neighbors.
- D. Routers broadcast the entire route table to all neighbors.
- E. An adjacency database is maintained by each router.
Answer: B,C,E
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to Nokia 7750 SR OS Routing Protocols Guide (OSPF and IS-IS operation, Chapter: Link-State Protocol Operation):
B (Correct):
"Routers advertise information about directly connected links to all routers in the same area via link-state advertisements (LSAs)." C (Correct):
"The adjacency database tracks established neighbor relationships, ensuring LSDB synchronization." E (Correct):
"All routers within the same OSPF or IS-IS area have identical link-state databases after full synchronization." Incorrect options:
A: Link-state protocols exchange only link-state information, not full routing tables (that's distance-vector behavior).
D: Sequence numbers are incremented by the originator when generating LSAs, not by intermediate routers during flooding.
NEW QUESTION # 29
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. Router R1 needs to have an import policy added to it.
- D. 'asbr' is missing from router R1's configuration.
Answer: B
NEW QUESTION # 30
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. Router R1 needs to have an import policy added to it.
- D. 'asbr' is missing from router R1's configuration.
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.
-
Thus, correct answer:
C). Router R5 does not have an export policy for these prefixes.
NEW QUESTION # 31
What command will show the OSPF neighbors, and their status on the Nokia 7750 SR?
- A. Show ospf adjacency
- B. Show router ospf neighbors
- C. Show ospf neighbors
- D. Show router ospf adjacency
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Monitoring):
The correct command syntax on the Nokia 7750 SR is:
show router ospf neighbor
This displays neighbor state, router ID, interface, priority, and adjacency status.
Thus, correct answer: B.
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NEW QUESTION # 32
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 2 Network LS A
- D. Type 1 Router LSA
Answer: C
NEW QUESTION # 33
Identify two attributes of Distance Vector Protocols: (Choose two)
- A. Send information about directly connected links to neighbors at periodic intervals.
- B. Use split horizon by default.
- C. Use holddown timers when topologies change to allow for convergence.
- D. Maintain multiple databases: neighbor, topology and routing.
Answer: B,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Distance Vector Fundamentals):
A (Correct): Split horizon is a default loop prevention technique in distance vector protocols like RIP.
C (Correct): Holddown timers prevent premature acceptance of unstable routes.
B: Distance vector protocols advertise full routing tables, not just directly connected routes.
D: This is a characteristic of link-state protocols (OSPF/IS-IS).
Thus, correct answers are A and C.
NEW QUESTION # 34
Which of the following best describes the type of packets used by OSPF routers to exchange updates on a point-to-point link?
- A. TCP packets sent to an IP multicast address.
- B. IP packets sent to an IP multicast address.
- C. IP packets sent to an IP unicast address.
- D. UDP packets sent to an IP multicast address.
Answer: B
NEW QUESTION # 35
Click the exhibit button.
Two neighboring OSPF routers have exchanged the packets shown. What state is the adjacency in?
- A. The adjacency is down.
- B. The adjacency is in exstart state.
- C. Full; both routers are exchanging Helios to maintain the adjacency.
- D. The adjacency is in the exchange state.
Answer: B
Explanation:
Analysis of the Exhibit:
The two routers are exchanging OSPF Hello packets.
Both Hello packets contain:
Same Hello and Dead Intervals.
Same Options field.
Same Router Priority.
Same subnet mask.
Authentication: Null.
BUT - The key issue is:
The Area ID is different:
Left router: Area ID 0.0.0.0
Right router: Area ID 0.0.1.1
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OSPF Neighbor Formation Rule:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Neighbor Adjacency Criteria):
"OSPF neighbors must have matching Area IDs, Hello Intervals, Dead Intervals, Stub Flag, Authentication, and Interface Subnet." Since the Area IDs are mismatched, adjacency will not form.
-
Thus, correct answer:
B). The adjacency is down.
-
Comprehensive and Detailed Explanation From Exact Extract:
OSPF adjacency formation fails when Area IDs do not match. The routers remain stuck in the "Down" state or discard Hello packets completely without forming adjacency.
-
Fully verified and aligned with Nokia 7750 SR OS documentation.
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NEW QUESTION # 36
What are the ways the RID can be created on an Nokia 7750 SR router? (Choose three)
- A. The loopback IP address
- B. From the last 32 bits of the chassis MAC address
- C. From the highest interface IP address
- D. By using the command "config router ospf rid X.X.X.X"
- E. From the first 32 bits of the chassis MAC address
- F. From the system IP address
Answer: B,D,F
NEW QUESTION # 37
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 that is connected to a stub area. The LSA is injected into the backbone area to provide routing information.
- 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 to describe a route to an ASBR to routers outside the area.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF ASBR Summary LSA):
Type 4 LSAs (ASBR Summary LSAs) are originated by ABRs.
They inform routers in other areas about how to reach the ASBR (not about external prefixes, but about the ASBR's router ID).
Thus, correct answer: A.
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NEW QUESTION # 38
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 2 Network LSA
- D. Type 1 Router LSA
Answer: C
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 # 39
What is the metric and maximum routable value for RIP?
- A. Hop count and 16
- B. Link cost and 16
- C. Link cost and 15
- D. Hop count and 15
Answer: D
NEW QUESTION # 40
A static route is created using the command "static-route 2.3.4.0/24 next-hop 1.2.3.4". What is the correct traceroute command to test this static route on a Nokia 7750 SR?
- A. traceroute next-hop 1.2.3.4
- B. traceroute 2.3.4.0/24 next-hop 1.2.3.4
- C. traceroute 2.3.4.1
- D. traceroute does not work on the Nokia 7750 SR
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (Static Route Testing):
"Use traceroute to test reachability by specifying an IP address within the destination subnet." The static route points to 2.3.4.0/24, so you select any valid host IP (e.g., 2.3.4.1) inside that subnet.
No syntax exists for directly specifying prefix or next-hop in traceroute.
Thus, correct answer is A.
NEW QUESTION # 41
Click the exhibit button.
Which of the following would correctly configure routers R2, R3, and R4?
- A. Option C
- B. Option D
- C. Option B
- D. Option A
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - Interface Types and ABR Configuration Section:
"When configuring ABRs and multiple OSPF areas, it's critical that the area numbers are assigned correctly, and point-to-point interfaces are configured where appropriate to eliminate DR/BDR elections on serial or direct links." Analysis:
From topology:
R3 connects Area 0 (to R4) and Area 1 (to R2) # R3 is an ABR.
The correct configuration must:
Assign proper areas for each link.
Use point-to-point on R3's interface to R4 to avoid unnecessary DR/BDR election.
Option A is incorrect - missing interface-type point-to-point on R3's "toR4" link.
Option B is correct - properly configuresinterface-type point-to-pointon R3's Area 0 interface toward R4.
Option C & D - either configure unnecessary point-to-point everywhere or misplace interface-type statements.
Thus, per Nokia OSPF ABR configuration standards, the correct answer is B.
#Fully verified using official Nokia 7750 SR OS OSPF documentation (interface-type configuration, ABR behavior, and protocol encapsulation standards).
NEW QUESTION # 42
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