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Nokia Network Routing Specialist II (NRS II) 4A0-113 Exam and Certification Test Engine
NEW QUESTION # 37
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 interfaces are configured as point-to-point on one side and broadcast on the other.
- C. The MTU does not match on both interfaces.
- D. The router ID is the same on both routers.
- E. An OSPF Hello has not been received from the neighbor.
Answer: C
NEW QUESTION # 38
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 area 1. Router R2 generates a type 7 LSA that is flooded through areas 0 and 2.
- B. Router R1 generates a type 5 LSA that is flooded through all OSPF areas.
- C. 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.
- D. Router R1 generates a type 7 LSA that is flooded through all OSPF areas.
Answer: C
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.
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Both answers are fully compliant with Nokia official OSPF protocol behavior.
NEW QUESTION # 39
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 # 40
When are virtual links used in OSPF?
- A. When an area needs to connect directly to another area without using area 0.
- B. When two areas need to communicate and there is no area 0.
- C. When two areas are connected to area 0, but there is no direct path between them.
- D. When an area needs to traverse another area to reach area 0.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - Virtual Links Section:
"A virtual link is used when an area that is not physically connected to area 0 needs to logically connect through another area to maintain OSPF backbone integrity." Virtual links allow non-backbone areas to connect to area 0 when a direct physical link is not available.
OSPF requires that all areas must be logically attached to area 0.
Thus, the correct answer is B.
NEW QUESTION # 41
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 not populated in the database but is forwarded to all neighbors
- B. The link state information is regarded as old and nothing is done.
- 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 and an acknowledgement is sent
Answer: D
NEW QUESTION # 42
In an OSPF Hello packet, which of the following fields must match for all neighbor routers on the segment? Choose three answers.
- A. Hello and Dead intervals PC.
- B. The list of neighbors
- C. Area ID W B.
- D. Stub flag
- E. Checksum values
Answer: A,C,D
NEW QUESTION # 43
What command could be used to verify proper configuration of a static route in an Nokia 7750 SR router?
- A. Show router route-table
- B. Show router routing-table
- C. Show route-table
- D. Show static
Answer: A
NEW QUESTION # 44
What is the default inbound metric for RIP on the Nokia 7750 SR?
- A. Whatever the advertised metric happens to be.
- B. This must be administratively set as there is no default value.
- C. A value of 15.
- D. A value of 1.
Answer: A
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 # 45
Click the exhibit button.
The OSPF packets shown have been exchanged between two neighbors. What state is the OSPF adjacency in?
- A. The adjacency state is full. The routers are exchanging database description packets to notify each other that all link state advertisements have been received.
- B. The adjacency is in the ex start state. The routers have exchanged database description packets, but still have to negotiate the starting sequence number.
- C. The adjacency state is two way because both routers have received a database description packet.
- D. The adjacency is in the exchange state. The next step is to exchange link state request and link state update packets.
Answer: D
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 # 46
In which of the following types of areas does an OSPF router not set the E bit in its Type 1 LSA?
- A. Normal area
- B. Backbone area
- C. Stub area
- D. Not so stubby area
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Structure, Stub and NSSA Operation):
"In stub areas, routers do not advertise external routes, so they clear the E-bit (External Routing Capability bit) in Type 1 LSAs. This indicates that AS-external LSAs are not supported in the area." Stub area (B): E-bit is NOT set.
NSSA area (A): E-bit remains set because NSSAs may carry Type 7 LSAs.
Backbone area and Normal area (C, D): E-bit is set to indicate support for external routes.
Thus, the correct answer is B.
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NEW QUESTION # 47
When redistributing OSPF into RIP V2 what must be taken into consideration for the redistribution to take place?
- A. You must divide the cost of the OSPF route by three
- B. The router must be configured as an ASBR
- C. The metric must be set accordingly for RIP
- D. The subnet mask must be removed from the OSPF route
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (RIP Redistribution):
RIP uses hop count as a metric, while OSPF uses cost.
When redistributing OSPF routes into RIP, you must assign a valid RIP metric (hop count) through policies or default metric settings.
If no metric is assigned, redistribution will fail or install unreachable routes (default RIP maximum is 16 hops).
Thus, correct answer: A.
NEW QUESTION # 48
What are the default Hello and Dead timer intervals for OSPF on the Nokia 7750 SR?
- A. 10 and 40 seconds
- B. 10 and 30 seconds
- C. 5 and 15 seconds
- D. 5 and 20 seconds
Answer: A
NEW QUESTION # 49
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. MTU mismatch
- D. Router ID not defined
- E. Area ID not the same
- F. Different metric set on each end of the link
Answer: A,C,E
NEW QUESTION # 50
Graceful Restart is supported by what IGPs?
- A. IS-IS
- B. RIPv1 and RIPv2
- C. BGP
- D. OSPF
Answer: A,D
NEW QUESTION # 51
What are the types of networks supported on a Nokia 7750 SR for OSPF? (Choose 2)
- A. Non-Broadcast Multi-Access
- B. Point-to-Multipoint
- C. Point-to-Point
- D. Broadcast
Answer: C,D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Supported Network Types):
"OSPF supports broadcast and point-to-point network types on the Nokia 7750 SR." Non-broadcast multi-access (NBMA) and point-to-multipoint are not supported natively.
Thus, correct answers: A, C.
NEW QUESTION # 52
Which LSA type is not found in point-to-point only OSPF networks?
- A. Type 3 Summary LSA
- B. Type 2 Network LSA
- C. Type 1 Router LSA
- D. Type 5 External LSA
Answer: B
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 # 53
Which of the following statements best describes the function of an OSPF Type 4 LSA?
- A. A Type 4 LSA is originated by an ASBR to describe a route to itself to routers outside the area.
- B. A Type 4 LSA is originated by an ABR to describe a route to an ASBR to routers outside the area.
- C. 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.
- 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: B
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 # 54
Click the exhibit button.
Which of the following would correctly configure routers R2, R3, and R4?
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: A
NEW QUESTION # 55
Which of the following statements concerning OSPFv3 is false?
- A. NSSA is not supported in OSPFv3.
- B. Router LSAs do not carry IPv6 prefix information
- C. OSPFv3 uses a 32-bit router ID.
- D. MD5 Authentication is not supported.
Answer: A
NEW QUESTION # 56
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. The networks will be represented with one entry of 10.0.0.0/24 in router R3's route table.
- B. The networks will be represented with one entry of 10.0.0.0/8 in router R3's routing table.
- C. Router R3's routing table can only contain one of the routes, which will result in route flapping.
- 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 # 57
Which of the following concerning OSPFv3 is TRUE?
- A. NSSA is supported in OSPFv3.
- B. Router LSAs carry IPv6 prefix information.
- C. OSPFv3 uses MD5 Authentication.
- D. OSPFv3 uses a 64-bit router ID.
Answer: A
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 # 58
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