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- CCNA Routing and Switching 200-105
41.
An engineer connects to Router R1 and issues a show ip ospf neighbor command.
The status of neighbor 2.2.2.2 lists FULL/BDR. What does the BDR mean?
- A.R1 is an Area Border Router.
- B.R1 is a backup designated router.
- C.Router 2.2.2.2 is an Area Border Router.
- D.Router 2.2.2.2 is a backup designated router.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The BDR designation on this line is for backup designated router (BDR). On this command, this notation means that the neighbor (2.2.2.2) is the BDR, not the local router on which the command was issued (R1 in this case). |
42.
An engineer migrates from a more traditional OSPFv2 configuration that uses
network commands in OSPF configuration mode to instead use OSPFv2 interface
configuration. Which of the following commands configures the area number
assigned to an interface in this new configuration?
- A.The area command in interface configuration mode
- B.The ip ospf command in interface configuration mode
- C.The router ospf command in interface configuration mode
- D.The network command in interface configuration mode
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| With OSPFv2 interface configuration mode, the configuration looks just like the traditional configuration, with a couple of exceptions. The network router subcommand is no longer required. Instead, each interface on which OSPF should be enabled is configured with an ip ospf process-id area area-id interface subcommand. This command refers to the OSPF routing process that should be enabled on the interface, and specifies the OSPFv2 area. |
43.
Which of the following configuration settings on a router does not influence which
IPv4 route a router chooses to add to its IPv4 routing table when using OSPFv2?
- A.auto-cost reference-bandwidth
- B.delay
- C.bandwidth
- D.ip ospf cost
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| SPF calculates the cost of a route as the sum of the OSPF interface costs for all outgoing interfaces in the route. The interface cost can be set directly (ip ospf cost), or IOS uses a default based on the reference bandwidth and the interface bandwidth. Of the listed answers, delay is the only setting that does not influence OSPFv2 metric calculations. |
44.
Which of the following distance vector features prevents routing loops by causing the
routing protocol to advertise only a subset of known routes, as opposed to the full
routing table, under normal stable conditions?
- A.Route poisoning
- B.Poison reverse
- C.DUAL
- D.Split horizon
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Split horizon causes a router to not advertise a route out of the same interface on which the router was learned. It also causes the router to not advertise about the connected route on an interface in updates sent out that interface. |
45.
Which of the following distance vector features prevents routing loops by advertising
an infinite metric route when a route fails?
- A.Dijkstra SPF
- B.DUAL
- C.Split horizon
- D.Route poisoning
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Route poisoning means advertising the failed route with an “infinite” metric, as opposed to simply ceasing to advertise the route. Of the incorrect answers, SPF defines how link-state protocols calculate and choose routes; DUAL defines how EIGRP does some of its processing to find replacement routes; and split horizon limits which routes a router advertises to help avoid routing loops. |
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