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質問 # 27
Which of the LSA types stay within an OSPF area and are not exported outside of the area? (Choose all that apply)
- A. Summary Router LSA
- B. Summary Network LSA
- C. Router LSA
- D. Network LSA
正解：C、D
質問 # 28
Click on the exhibit.
In the topology shown, router R1 is an ASBR configured to export external routes to OSPF. There are no stub or NSSA areas. Which of the following regarding LSAs is TRUE?
- A. Only routers R2 and R3 receive Type 5 LSAs advertised by router R1.
- B. Router R3 will advertise Type 7 LSAs to Area 0 and Area 2.
- C. Router R7 will receive Type 5 LSAs advertised by router R1.
- D. Router R2 will receive Type 5 and Type 7 LSAs.
正解：C
質問 # 29
An operator configures an Nokia 7750 SR with a loopback interface and IPv6 address. The operator then configures a routing policy to redistribute the loopback prefix into OSPFv3. What type of LSA is used to advertise the route to other OSPFv3 routers in the same area?
- A. Network LSA
- B. AS External LSA
- C. Inter-Area Prefix LSA
- D. None of the statements are correct.
- E. Intra-Area Prefix LSA
- F. Router LSA
正解：B
質問 # 30
Select the answer below that correctly lists the 5 different OSPF packet types.
- A. Link State Update, Link State Refresh, Link State Acknowledgement, Database Descriptor, Notification
- B. Hello, Link State Refresh, Link State Update, Link State Acknowledgement, Link State Authentication
- C. Hello, Link State Update, Link State Request, Link State Acknowledgement, Database Descriptor
- D. Hello, Link State Update, Link State Packet, Link State Acknowledgement, Database Descriptor
正解：C
質問 # 31
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 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
- 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 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.
- E. Convergence will not be triggered because switches cannot run routing protocols between them.
正解：D
質問 # 32
When are virtual links used in OSPF?
- A. When an area needs to connect directly to another area without using area 0.
- B. When an area needs to traverse another area to reach area 0.
- C. When two areas need to communicate and there is no area 0.
- D. When two areas are connected to area 0, but there is no direct path between them.
正解：B
質問 # 33
Exhibit
Given the two configurations shown, identify the two incorrect statements below: (Choose two)
- A. Metric values differ, but this does not prevent OSPF operation.
- B. The system interface is missing in one configuration so OSPF will not operate correctly.
- C. Both routers will generate OSPF Hello packets.
- D. The interface type settings differ, but OSPF will still operate correctly.
正解：B、D
質問 # 34
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. There is not enough information to tell.
- D. Area 1 of router R1 should not be configured as a stub.
正解：A
質問 # 35
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. Not So Stubby Area
- B. Standard Area
- C. Stub Area
- D. Backbone Area
正解：A、B、D
質問 # 36
Static routing will be used in a network between a corporate head office, with many connected networks, and a branch office, with one connection to the head office. Which of the following best describes the likely configuration?
- A. The corporate head office router will have a default route and the branch site will have a more specific static route.
- B. The corporate head office router and the branch office router will both have specific static routes.
- C. The corporate head office router and the branch router will both have default routes.
- D. The corporate head office router will have a more specific static route and the branch office router will have a default route.
正解：D
質問 # 37
Which of the following OSPFv3 LSAs have an AS scope?
- A. Network LSA
- B. Link Local LSA
- C. Intra-Area Prefix LSA
- D. None of the above LSAs have an AS scope.
- E. Inter-Area Router LSA
- F. Router LSA
正解：D
質問 # 38
Identify two attributes of Distance Vector Protocols: (Choose two)
- A. Use holddown timers when topologies change to allow for convergence.
- B. Use split horizon by default.
- C. Send information about directly connected links to neighbors at periodic intervals.
- D. Maintain multiple databases: neighbor, topology and routing.
正解：A、B
質問 # 39
Click on the exhibit.
Router R2 learns the networks shown from IS-IS. Router R2 is configured to redistribute routes from IS-IS to OSPF as shown. Assume the OSPF and IS-IS adjacencies are operational.
How many OSPF Type 5 LSAs will router R1 receive from router R2?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
正解：B
質問 # 40
Which of the following statements best describes an OSPF type 3 LSA?
- A. An OSPF type 3 LSA is an inter-area LSA, generated by an ASBR to describe external routes.
- B. An OSPF type 3 LSA is an intra-area LSA, generated by the ABR only when route summarization is configured.
- C. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR only when route summarization is configured.
- D. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR to describe a route to neighbors outside the area.
正解：D
質問 # 41
Which LSA type is not found in point-to-point only OSPF networks?
- A. Type 3 Summary LSA
- B. Type 1 Router LSA
- C. Type 5 External LSA
- D. Type 2 Network LS A
正解：D
質問 # 42
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 2 Network LSA
- B. Type 3 Summary LSA
- C. Type 4 ASBR LSA
- D. Type 1 Router LSA
正解：D
質問 # 43
Click the exhibit button.
If router R2 redistributes the IS-IS route to 192.168.3.0/24 into OSPF, router R3 preference of these two routes? Choose two answers.
- A. The IS-IS Level 1 internal preference
- B. The OSPF internal preference
- C. The IS-IS Level 1 external preference
- D. The IS-IS Level 2 external preference
- E. The IS-IS Level 2 internal preference
- F. The OSPF external preference
正解：A、F
質問 # 44
Choose the Distance Vector Protocols from the list below:
- A. RIPv1
- B. IS-IS
- C. RIPv2
- D. OSPF
正解：A、C
質問 # 45
Click the exhibit button.
Router R2 advertises the network 192.168.3.0/24 to router R1 via OSPF. A route policy has been constructed to discard the route on router R1; however, it is not working. What is the problem?
- A. The policy "reject" should be set for import rather than export.
- B. This is not possible because OSPF cannot use import policies.
- C. The policy was likely not "committed" after creation.
- D. The prefix list reject should be "192.168.3.0/16 exact".
- E. Router R1 should be configured as an OSPF "asbr".
正解：B
質問 # 46
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 state is full. The routers are exchanging database description packets to notify each other that all link state advertisements have been received.
- D. The adjacency is in the ex start state. The routers have exchanged database description packets, but still have to negotiate the starting sequence number.
正解：D
質問 # 47
What is the source IP address in an OSPF update?
- A. 224.0.0.6
- B. The unicast IP address of the interface the update is being sent on.
- C. The system address of the router
- D. 224.0.0.5
正解：B
質問 # 48
Which of the following are similarities between OSPF and IS-IS? Choose two answers.
- A. Slow convergence after link failures.
- B. Support hierarchy through the use of areas.
- C. Metric is based on hop count.
- D. Link state updates sent using layer 3 multicast.
- E. Support for CIDR.
正解：B、E
質問 # 49
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