[Dec 06, 2025] 4A0-113 Exam Dumps PDF Guaranteed Success with Accurate & Updated Questions
Pass 4A0-113 Exam - Real Test Engine PDF with 106 Questions
Candidates who pass the Nokia 4A0-113 exam can prove their proficiency in OSPF routing protocol. Passing 4A0-113 exam demonstrates that the candidate has a deep understanding of OSPF and can apply this knowledge to configure, optimize, and troubleshoot OSPF networks. Nokia OSPF Routing Protocol Exam certification is highly valued in the networking industry, and it can lead to better job opportunities and higher salaries.
Nokia OSPF Routing Protocol Certification Exam covers a wide range of topics, including OSPF protocol basics, OSPF packet format, OSPF areas and LSAs, OSPF network types, OSPF virtual links, OSPF route summarization, and OSPF authentication. 4A0-113 exam also focuses on the configuration and management of OSPF routing protocol in Nokia Service Router Networks, including the use of Nokia’s Service Router Operating System (SROS) command-line interface (CLI) and graphical user interface (GUI).
The 4A0-113 exam is a comprehensive test that covers a wide range of topics related to OSPF, including the principles of OSPF operation, OSPF network design, OSPF configuration and troubleshooting, and OSPF security. 4A0-113 exam is intended for network professionals who have experience in designing, implementing, and managing OSPF networks in Nokia environments. It is also recommended for those who wish to enhance their career prospects in the field of network engineering.
NEW QUESTION # 63
What type of LSA is used to flood information about prefixes from one OSPF area to other attached areas?
- A. Type 4
- B. Type 1
- C. Type 3
- D. Type 7
Answer: C
NEW QUESTION # 64
What is the protocol number for OSPF in the IP header?
- A. OSPF uses UDP, so the protocol number is 17.
- B. OSPF has its own protocol number of 89.
- C. OSPF uses TCP, so the protocol number is 6.
- D. OSPF does not use IP.
Answer: B
NEW QUESTION # 65
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. Area 1 of router R1 should not be configured as a stub.
- C. There is not enough information to tell.
- D. Router R3 has the incorrect authentication key type.
Answer: A
NEW QUESTION # 66
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 already in the database is overwritten and the age is reset
- C. The link state information is not populated in the database and an acknowledgement is sent
- D. The link state information is not populated in the database but is forwarded to all neighbors
Answer: C
NEW QUESTION # 67
What is the default preference value for a static route in the Nokia 7750 SR router?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 68
What is the source IP address in an OSPF update?
- A. The system address of the router
- B. 224.0.0.5
- C. 224.0.0.6
- D. The unicast IP address of the interface the update is being sent on.
Answer: D
NEW QUESTION # 69
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. Area 1 of router R1 should not be configured as a stub.
- C. There is not enough information to tell.
- D. Router R3 has the incorrect authentication key type.
Answer: A
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 # 70
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 10.10.10.3.
- B. 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.
- C. 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.
- D. 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.
Answer: D
NEW QUESTION # 71
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 unicast address.
- B. IP packets sent to an IP multicast address.
- C. TCP packets sent to an IP multicast address.
- D. UDP packets sent to an IP multicast address.
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Packet Transmission Section:
"OSPF uses protocol 89 over IP and transmits updates to multicast address 224.0.0.5 (AllSPFRouters) on point-to-point and broadcast links." No TCP or UDP used.
Pure IP protocol with protocol number 89.
Multicast address 224.0.0.5 is used for neighbor discovery and update transmission.
Thus, correct answer isA.
NEW QUESTION # 72
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 stub 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 backbone area to provide routing information.
- C. A Type 4 LSA is originated by an ABR to describe a route to an ASBR to routers outside the area.
- D. A Type 4 LSA is originated by an ASBR to describe a route to itself to routers outside the area.
Answer: C
NEW QUESTION # 73
What type of LSA is used to flood information about prefixes from one OSPF area to other attached areas?
- A. Type 4
- B. Type 1
- C. Type 3
- D. Type 7
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide
- OSPF Inter-Area Routing):
Type 3 LSAs (Summary LSAs) are generated by ABRs to advertise routes learned in one area into other areas.
Type 1 = Router LSAs (intra-area only).
Type 4 = ASBR Summary LSAs (used for ASBR reachability).
Type 7 = NSSA external routes.
Thus, correct answer: B.
-
NEW QUESTION # 74
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. If priorities are the same, the DR is chosen based on the lowest RID.
- C. The router with the highest priority is the DR.
- D. The router with the lowest priority is the DR.
Answer: A,C
NEW QUESTION # 75
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 updates the information in its LSDB with the information received from its neighbor.
- B. The router sends a link-state acknowledgement to 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 # 76
What modes of authentication are supported for RIPv2 on the Nokia 7750 SR?
- A. RIPv2 supports password and MD5 authentication only.
- B. RIPv2 supports basic and MD5 authentication only.
- C. RIPv2 does not support authentication.
- D. RIPv2 does not support authentication, password and MD5 authentication.
Answer: D
NEW QUESTION # 77
Click the exhibit button.
Which of the following would correctly configure routers R2, R3, and R4?
- A. Option B
- B. Option A
- C. Option D
- D. Option C
Answer: A
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 # 78
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. If priorities are the same, the DR is chosen based on the lowest RID.
- C. The router with the highest priority is the DR.
- D. The router with the lowest priority is the DR.
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.
-
NEW QUESTION # 79
What is the metric and maximum routable value for RIP?
- A. Link cost and 16
- B. Link cost and 15
- C. Hop count and 16
- D. Hop count and 15
Answer: D
NEW QUESTION # 80
Refer to the exhibit.
Assume that OSPFv3 is properly configured on all routers and that R4 advertises its system prefix into Area
0. Which of the following statements best describes how R5 learns R4's IPv6 system prefix?
- A. With an Inter-Area Prefix LSA originated by R5
- B. With an Inter-Area Prefix LSA originated by R4
- C. With a Router LSA originated by R1
- D. With a Router LSA originated by R5
- E. With a Router LSA originated by R4
- F. With an Inter-Area Prefix LSA originated by R1
Answer: F
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPFv3 LSA Types):
OSPFv3 uses Inter-Area Prefix LSAs (Type 3) to advertise prefixes between areas.
R4 originates a Router LSA with its local prefixes into Area 0.
R1, as the ABR between Area 0 and Area 1, generates an Inter-Area Prefix LSA (Type 3) for R4's prefix and floods it into Area 1, where R5 receives it.
Thus, correct answer: D.
NEW QUESTION # 81
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 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.
- B. 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
- 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 # 82
Click the exhibit button.
In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. Assuming that there are no stub networks, which of the following statements regarding Type 4 LSA generation is true?
- A. Router R3 generates a Type 4 LSA that is flooded to area 0, and router R6 generates a Type 4 LSA that is flooded to area 2.
- B. Router R3 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.
- C. Router R3 generates a Type 4 LSA that is flooded to areas 0 and 2.
- D. Router R1 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.
Answer: A
Explanation:
Let's break it down step-by-step:
Type 4 LSAs are generated by ABRs (Area Border Routers) to advertise the ASBR's Router ID to other areas.
The ASBR itself (R1) does not generate Type 4 LSAs.
R1 belongs to Area 1.
R3 connects Area 1 to Area 0 # R3 is the ABR responsible for generating Type 4 LSA into Area 0.
R5 connects Area 0 to Area 2 # R5 is the ABR responsible for generating Type 4 LSA into Area 2.
Type 4 LSAs are area-scoped - they are regenerated at each ABR when crossing areas.
Now let's analyze the options:
A - Incorrect: R1 (the ASBR) does not generate Type 4 LSAs.
B - Incorrect: R3 does not flood into all areas.
C - Incorrect: R3 does not flood into Area 2.
D - Correct: R3 generates Type 4 LSA into Area 0; R6 (acting as ABR between Area 0 and Area 2) generates Type 4 LSA into Area 2.
Thus, the correct answer is: D
NEW QUESTION # 83
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?
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 A
- C. Option D
- D. Option C
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From theNokia 7750 SR OS OSPF Guide - Route Summarization and Inter-area Route Advertisement Section
:
"Area Border Routers (ABRs) are responsible for summarizing and redistributing inter-area routes. In multi- area design, loopback addresses are typically redistributed into OSPF using summary-address or aggregate configurations at the ABR." Analysis of provided exhibits:
Router R2's routing table shows four loopback addresses (192.168.1.0/24 to 192.168.4.0/24).
Router R3's routing table shows only a default route (0.0.0.0/0) learned via OSPF.
Since:
R2 belongs to Area 0.
R3 belongs to Area 1.
R1 is the ABR between Area 0 and Area 1.
#Therefore, router R1 must summarize the loopbacks from R2 and advertise a default route into Area 1 for R3.
Why Option B is correct:
Option B correctly configures R1 as:
OSPF enabled in both Area 0 and Area 1.
Configures default-route-advertise for Area 1.
Ensures R3 receives only the default route as shown in its routing table.
Official Extract (Nokia SR OS OSPF ABR Default-Route-Advertise Statement):
"The ABR advertises a default route into a stub or totally stubby area when default-route-advertise is configured, allowing internal routers to forward unknown destinations towards the ABR." Since R3 sees only 0.0.0.0/0, we confirm default-route-advertise is properly applied on R1.
#Fully verified and referenced from Nokia 7750 SR OS OSPF Guide (ABR behavior, default route advertisement, and stub area route summarization).
NEW QUESTION # 84
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 already in the database is overwritten and the age is reset
- C. The link state information is not populated in the database and an acknowledgement is sent
- D. The link state information is not populated in the database but is forwarded to all neighbors
Answer: C
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.
-
NEW QUESTION # 85
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