2025 100% Free 4A0-113 Daily Practice Exam With 106 Questions
4A0-113 exam torrent Nokia study guide
NEW QUESTION # 16
Select the answer below that correctly lists the 5 different OSPF packet types.
- A. Hello, Link State Refresh, Link State Update, Link State Acknowledgement, Link State Authentication
- B. Hello, Link State Update, Link State Packet, Link State Acknowledgement, Database Descriptor
- C. Link State Update, Link State Refresh, Link State Acknowledgement, Database Descriptor, Notification
- D. Hello, Link State Update, Link State Request, Link State Acknowledgement, Database Descriptor
Answer: D
NEW QUESTION # 17
Click the exhibit button.
The OSPF packets shown have been exchanged between two neighbors. What state is the OSPF adjacency in?
- A. The adjacency is in the exchange state. The next step is to exchange link state request and link state update packets.
- B. The adjacency state is two way because both routers have received a database description packet.
- C. The adjacency is in the ex start state. The routers have exchanged database description packets, but still have to negotiate the starting sequence number.
- D. The adjacency state is full. The routers are exchanging database description packets to notify each other that all link state advertisements have been received.
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Neighbor State Machine Section:
"During the Exchange state, routers exchange Database Description (DBD) packets containing summaries of LSAs. Sequence numbers and flags are used to coordinate this exchange." Both routers are sendingDR_DESC (Database Description)packets.
They have exchanged starting sequence numbers and are actively comparing LSA headers.
Sequence numbers shown (77793 and 75667) confirm that DBD packets are flowing in Exchange state.
Thus, correct answer isB.
NEW QUESTION # 18
In an OSPF environment, what must a router receive after it sends out an update?
- A. The router must receive a Hello
- B. The router must receive an acknowledgment
- C. The router must receive a new sequence number
- D. The router must receive a Link State Packet
Answer: B
NEW QUESTION # 19
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
NEW QUESTION # 20
What is the default priority value used for electing the DR on an Nokia 7750 SR running OSPF on an Ethernet?
- A. Priority of 0
- B. Priority of 255
- C. Priority of 1
- D. Priority of 64
Answer: C
NEW QUESTION # 21
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
- D. Summary router LSA
- E. Summary network LSA
Answer: B,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Types Summary):
A (Router LSA - Type 1): Always area-scoped.
B (Network LSA - Type 2): Always area-scoped.
C & D (Summary LSAs - Type 3): Flooded between areas.
E (AS-External LSAs - Type 5): Have AS-wide scope.
Thus, correct answers: A, B.
NEW QUESTION # 22
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: D
NEW QUESTION # 23
When an OSPF adjacency is stuck in the "ExchStart" state, what is the most likely cause?
- A. The MTU does not match on both interfaces
- B. The Router ID is the same on both routers
- C. A OSPF Hello has not been received from the neighbor
- D. OSPF is not enabled on one of the routers
Answer: A
NEW QUESTION # 24
In an OSPF Hello packet what fields must match all neighbor routers on the segment? (Choose 3)
- A. Stub flag
- B. Area ID
- C. The list of neighbors
- D. DR and BDR addresses
- E. Hello and Dead Intervals
Answer: A,B,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 # 25
Which one of the commands below will create a static route to network 2.3.4.0/24 on the Alcatel-Lucent 7750 SR router?
- A. Static-route next-hop 3.4.5.6 2.3.4.0/24
- B. Static route 2.3.4.0/24 next hop 3.4.5.6
- C. Static route 2.3.4.0 255.255.255.0 next hop 3.4.5.6
- D. Static-route 2.3.4.0/24 next-hop 3.4.5.6
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS CLI Guide (Static Route Configuration Syntax):
"Correct syntax: configure router static-route <prefix> next-hop <ip-address>" Only option D uses the correct syntax and exact keyword structure.
Thus, correct answer is D.
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NEW QUESTION # 26
What must be configured on the Nokia 7750 SR for RIP to advertise locally attached links?
- A. Access-lists denoting what is to be advertised
- B. A policy statement within the router identifying what is to be advertised
- C. A group and neighbor statement for each peer
- D. Default metrics for each link
Answer: B
NEW QUESTION # 27
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 # 28
Click the exhibit button.
Routers R1 „ R2, and R3 are running a classful routing protocol between them. Assuming that router R1 advertises all directly connected networks, how will these networks be represented in router R3's routing table?
- A. Router R3's routing table can only contain one of the routes, which will result in route flapping.
- B. The networks will be represented with one entry of 10.0.0.0/8 in router R3's routing table.
- C. The networks will be represented with one entry of 10.0.0.0/24 in router R3's route table.
- D. Router R3's routing table will have one entry for 10.1.1.0/24 and one entry for 10.1.2.0/24.
Answer: B
Explanation:
According to the official Nokia exam prep documentation for classful routing logic (mirrored in the Nokia
4A0#101 study guide), routers R1, R2, and R3 run a classful routing protocol. When R1 advertises its directly connected subnets 10.1.1.0/24 and 10.1.2.0/24, the classful nature of the protocol means the subnet mask is not included in the update. The entire classful network portion is advertised instead. Since both your /24s fall within the same Class A network (10.0.0.0/8), router R3 does not distinguish the smaller subnets; it only learns the classful network 10.0.0.0/8.
From the guide:
"Routers R1, R2, and R3 are running a classful routing protocol. Router R1 advertises the directly connected networks 10.1.1.0/24 and 10.1.2.0/24. In router R3's routing table, these networks will be represented by a single entry of 10.0.0.0/8."
NEW QUESTION # 29
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. Information about directly connected links is sent to all neighbors.
- C. An adjacency database is maintained by each router.
- D. The topological database is the same for all routers in a single area.
- E. Routers broadcast the entire route table to all neighbors.
Answer: B,C,D
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 # 30
Which of the following statements regarding OSPF routing updates on a point-to-point link is true?
- A. On a point-to-point link, a DR and BDR are elected. To ensure resiliency, both the DR and BDR send link-state advertisements describing the network.
- B. On a point-to-point link, there is no need for a DR and BDR election. All routing updates are sent to the unicast address of the neighbor's interface.
- C. On a point-to-point link, there is no need for a DR and BDR election; all routing updates are sent to 224.0.0.5.
- D. On a point-to-point link, a DR and BDR are elected. The DR sends link-state advertisements describing the network.
Answer: C
NEW QUESTION # 31
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Nokia 4A0-113 Exam covers a range of topics related to OSPF, including the basics of OSPF configuration, different types of OSPF networks, and the mechanics of OSPF packet exchange. Additionally, 4A0-113 exam covers advanced topics such as OSPF route summarization, OSPF authentication, and OSPF virtual links. 4A0-113 exam is designed to test both practical knowledge and conceptual understanding of OSPF concepts.
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