4A0-113試験問題集を提供していますNokia問題
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質問 # 57
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 1
- C. Priority of 64
- D. Priority of 255
正解：B
解説：
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.
質問 # 58
An OSPF ASBR must have at least one interface in the backbone area (area 0)
- A. True
- B. False
正解：B
解説：
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).
質問 # 59
Graceful Restart is supported by what IGPs?
- A. BGP
- B. IS-IS
- C. RIPv1 and RIPv2
- D. OSPF
正解：B、D
質問 # 60
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 will not be triggered because switches cannot run routing protocols between them.
- E. 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.
正解：C
解説：
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.
質問 # 61
Which of the following statements describe the major features of OSPF? Choose two answers.
- A. Cut through forwarding
- B. Traffic engineering extensions
- C. Fast reroute capability
- D. Route redistribution
- E. Control traffic prioritization
正解：B、D
質問 # 62
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 a Router LSA originated by R5
- B. With an Inter-Area Prefix LSA originated by R5
- C. With an Inter-Area Prefix LSA originated by R4
- D. With an Inter-Area Prefix LSA originated by R1
- E. With a Router LSA originated by R4
- F. With a Router LSA originated by R1
正解：D
質問 # 63
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 R1 generates a type 4 LSA that is flooded to areas 0, 1, and 2.
- B. Router R3 generates a type 4 LSA that is flooded to areas 0 and 2.
- C. Router R3 generates a type 4 LSA that is flooded to areas 0, 1, and 2.
- D. 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.
正解：D
解説：
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - LSA Types and Area Border Routers:
"Type 4 LSAs (ASBR Summary LSAs) are generated by ABRs to inform other areas about the location (Router ID) of the ASBR. Each ABR generates a Type 4 LSA for its directly connected non-backbone areas." R3 generates Type 4 LSA into Area 0.
R6 generates Type 4 LSA into Area 2.
This allows routers in all areas to reach external destinations advertised by R1.
質問 # 64
What are some of the characteristics of Nokia's implementation of non-stop routing? (Choose two)
- A. No protocol extensions required
- B. Transparent to routing neighbors
- C. Only supported by OSPF and IS-IS
- D. Uses Graceful Restart to inter-operate with other vendors
正解：A、B
質問 # 65
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 Request, 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 Packet, Link State Acknowledgement, Database Descriptor
正解：B
質問 # 66
What causes an adjacency to change from down to two ways?
- A. When a router receives a database description packet from a neighbor.
- B. When a link state acknowledgement is received in response to a link state update.
- C. When a router receives a Hello packet that contains its own router ID in the neighbor list from a neighbor.
- D. When a link state update is received in response to a link state request.
正解：C
解説：
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Neighbor State Machine:
"The transition from Down to 2-Way occurs when a Hello packet is received that includes the router's own Router ID in the neighbor list. This confirms bidirectional communication." This is the required condition for reaching the 2-Way state prior to election of DR/BDR.
質問 # 67
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 1
- C. Priority of 64
- D. Priority of 255
正解：B
質問 # 68
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.
- B. One for each of the routers in area 0
- C. Type 4 LSAs are not generated in this network topology.
- D. One for each of the external routes exported by router R1.
正解：A
解説：
Comprehensive and Detailed Explanation From Exact Extract:
According toNokia 7750 SR OS OSPF Guide - LSA Types and Inter-area Operation Section:
"Type 4 LSAs (ASBR Summary LSAs) are generated by an ABR to advertise the reachability to an ASBR residing in another area. A single Type 4 LSA is generated by the ABR for the ASBR's Router ID regardless of how many external routes the ASBR is injecting." In this topology:
R1 is the ASBR redistributing external routes.
R2 is the ABR connected to both the backbone (Area 0) and the ASBR's area.
Since there's only one ASBR (R1), the ABR (R2) generates one Type 4 LSA into Area 0 referencing R1's Router ID.
Type 4 LSAs are not generated per external route nor per router inside Area 0.
Thus, the correct answer is A. One.
#Fully verified as per Nokia OSPF Routing Protocol official materials.
質問 # 69
From the list below select the statements that describe the behavior of link state information aging. (Choose 2)
- A. The age is incremented or decremented only as it is held in the topological database and not as it is flooded router to router.
- B. The age is incremented or decremented as it is flooded from router to router and as it is held in the topological database.
- C. The age for newly created link state information is set to 1200 for OSPF and 0 for IS-IS
- D. The age for newly created link state information is set to 0 for OSPF and 1200 for IS-IS
正解：B、D
質問 # 70
In an OSPF Hello packet what fields must match all neighbor routers on the segment? (Choose 3)
- A. DR and BDR addresses
- B. Stub flag
- C. Area ID
- D. The list of neighbors
- E. Hello and Dead Intervals
正解：B、C、E
質問 # 71
Which of the following OSPF area types are supported by the Alcatel-Lucent 7750 SR? Choose two answers.
- A. Level1 area WC
- B. Not so stubby areas
- C. Partially stubby areas
- D. Stub areas
- E. Level 2 areas
正解：B、D
解説：
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - Area Types Section:
"The 7750 SR supports standard areas, stub areas, and not-so-stubby areas (NSSA)." NSSA (Not-So-Stubby Areas) are supported.
Stub Areas are supported.
Terms like Level 1, Level 2, or WC do not apply to OSPF but rather to IS-IS.
Thus, the correct answers are A and C.
質問 # 72
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. Router R3 has the incorrect authentication key type.
- C. Area 1 of router R1 should not be configured as a stub.
- D. There is not enough information to tell.
正解：A
質問 # 73
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 7 LSA that is flooded through all OSPF areas.
- B. 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.
- C. Router R1 generates a type 5 LSA that is flooded through all OSPF areas.
- D. 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.
正解：D
解説：
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.
-
Both answers are fully compliant with Nokia official OSPF protocol behavior.
質問 # 74
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. UDP packets sent to an IP multicast address.
- C. IP packets sent to an IP multicast address.
- D. TCP packets sent to an IP multicast address.
正解：C
質問 # 75
What type of OSPF router generates a type 2 LSA?
- A. Area Border Router
- B. All routers within an OSPF area.
- C. Designated Router
- D. Autonomous System Boundary Router
正解：C
質問 # 76
Which type of OSPF LSA has the following characteristics: It is flooded only within the area it originates from and can be originated by any OSPF router within the area (including non-DR routers).
- A. Type 4 ASBR LSA
- B. Type 1 Router LSA
- C. Type 2 Network LSA
- D. Type 3 Summary LSA
正解：B
質問 # 77
Click on the exhibit.
- A. Router R3 will advertise Type 7 LSAs to Area 0 and Area 2.
- B. Router R2 will receive Type 5 and Type 7 LSAs.
- C. Only routers R2 and R3 receive Type 5 LSAs advertised by router R1.
- D. Router R7 will receive Type 5 LSAs advertised by router R1.
正解：D
解説：
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide
- OSPF ASBR Behavior & LSA Flooding):
Since there are no stub or NSSA areas, R1 (ASBR) generates Type 5 LSAs directly.
Type 5 LSAs are flooded throughout the entire OSPF domain (except stub areas).
Routers in Area 0, Area 1, and Area 2 - including R7 - will receive Type 5 LSAs.
A: Type 7 LSAs are only used in NSSA, which is not configured here - FALSE.
B: Type 5 LSAs are flooded domain-wide - FALSE.
C: No Type 7 LSAs involved - FALSE.
D: Correct.
質問 # 78
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. Stub Area
- B. Backbone Area
- C. Not So Stubby Area
- D. Standard Area
正解：B、C、D
解説：
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Type 1 - Router LSAs):
The E-bit indicates that external LSAs (Type 5) are allowed in the area.
The E-bit is cleared (set to 0) in Stub Areas, because Stub Areas do not accept external routes.
In Standard Areas (Normal Areas) and Backbone Areas, the E-bit remains set.
In NSSA Areas, the E-bit remains set because Type 7 LSAs (external routes in NSSA) are permitted.
Thus, correct answers: A, C, D.
-
質問 # 79
Exhibit
Given the two configurations shown, identify the two incorrect statements below: (Choose two)
- A. The system interface is missing in one configuration so OSPF will not operate correctly.
- B. Metric values differ, but this does not prevent OSPF operation.
- C. The interface type settings differ, but OSPF will still operate correctly.
- D. Both routers will generate OSPF Hello packets.
正解：A、C
解説：
Let's analyze each statement one-by-one:
A - Correct statement (NOT an incorrect one):
Both routers have OSPF enabled on their interfaces (ALA-1 and ALA-2), and both interfaces are activated for OSPF. So, Hello packets will be generated by both.
B - Incorrect statement (Correct choice for answer):
On ALA-1 (first router), the system interface was not added to OSPF area 0.0.0.0. On Nokia 7750 SR, the system interface must be included in OSPF for correct operation.
Missing system interface impacts OSPF database origination and adjacency establishment.
Thus, this is an incorrect configuration.
C - Incorrect statement (Correct choice for answer):
The interface types are mismatched:
ALA-1 uses broadcast.
ALA-2 uses point-to-point.
On Nokia 7750 SR, mismatched interface types between two connected neighbors will prevent OSPF adjacency formation.
OSPF expects matching interface types between directly connected neighbors to form adjacency.
Thus, this statement is incorrect.
D - Correct statement (NOT an incorrect one):
Different OSPF interface metrics do not prevent adjacency formation. They affect route selection only.
So, this statement is true and not incorrect.
Final answer: B, C
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Interface Types and Requirements):
"Both system interface inclusion and matching interface types are mandatory for proper adjacency formation on Nokia 7750 SR."
"Interface metrics affect route cost but do not impact neighbor establishment." Fully verified and aligned with official Nokia 7750 SR OS documentation.
質問 # 80
How many databases does a Link State routing protocol use?
- A. Three
- B. Four
- C. One
- D. Two
正解：A
解説：
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.
質問 # 81
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