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81.
With an OSPFv3 Address Family configuration supporting both IPv4 and IPv6 routing,
which of the following is true regarding OSPFv3’s link-state database?
- A.IPv4 LSAs populate one database, while IPv6 LSAs populate a second database.
- B.Information received from all LSAs is aggregated in a single link-state database.
- C.OSPFv3 does not use a link-state database. Rather, it represents link-state information in a lookup table similar to Cisco Express Forwarding (CEF).
- D.A virtual Address Family is created, and it contains information from both IPv4 and IPv6 LSAs.
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| When using OSPFv3’s Address Family configuration to support both IPv4 and IPv6, LSAs for both IPv4 and IPv6 networks populate a single link-state database. The database can be viewed with the show ospfv3 database command. |
82.
In an OSPFv3 Address Family configuration, how do you tell an interface to participate in the OSPFv3 process for IPv6 routes?
- A.Router(config-router)# ospfv3 process_id ipv6 area area_number
- B.Router(config-router-af)# ospfv3 process_id ipv6 area area_number
- C.Router(config-router-af-if)# ospfv3 process_id ipv6 area area_number
- D.Router(config-if)# ospfv3 process_id ipv6 area area_number
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| With Named EIGRP, all EIGRP configuration can be done under a single EIGRP virtual instance. However, with an OSPFv3 Address Family configuration, you have to enter interface configuration mode to instruct an interface to participate in the routing process. The command (issued in interface configuration mode) is ospfv3 process_id ipv6 area area_number . |
83.
Which of the following commands is most likely to make a switch become the root bridge for VLAN 5, assuming that all switches have the default STP parameters?
- A.spanning-tree root
- B.spanning-tree root vlan 5
- C.spanning-tree vlan 5 priority 100
- D.spanning-tree vlan 5 root
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
|
OSPFv3 introduces two LSAs, Type 8 LSAs (called Link LSAs ) and Type 9 LSAs
(called Intra-Area Prefix LSAs ). The Type 8 LSAs, called Link LSAs, only exist on a local link, where they are used by a router to advertise its link-local address to all other routers on the same link. Additionally, the Type 8 LSA provides a listing of all IPv6 addresses associated with a link to routers on that link. OSPFv3 also uses the Type 8 LSA to set option bits for a specific network’s LSA. A Type 9 LSA can send information about IPv6 networks (including stub networks) attached to a router (similar to the Type 1 LSA for IPv4 networks). Additionally, a Type 9 LSA can send information about transit network segments within an area (similar to the Type 2 LSA for IPv4 networks). |
84.
Which of the following answers is the least likely reason for an engineer to choose to
use route redistribution?
- A.To exchange routes between merged companies
- B.To give separate control over routing to different parts of one company
- C.To support multiple router vendors
- D.To knit together an OSPF area if the area becomes discontiguous
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The three incorrect answers list typical reasons for using route redistribution. The correct answer—the least likely reason among the answers for using route redistribution— lists a problem for which an OSPF virtual link is often used. Route redistribution could be attempted to solve a problem with a discontiguous OSPF area, but the redistribution completely changes the LSAs that would have otherwise been known and could have negative impacts on route summaries and cause routing loops, and have other problems as well. |
85.
For a router to successfully redistribute routes between OSPF and EIGRP, which of
the following are true? (Choose two.)
- A.The router must have one routing protocol configured, but configuration for both routing protocols is not necessary.
- B.The router must have at least one working link connected to each routing domain
- C.The redistribute command must be configured under EIGRP to send the routes to OSPF
- D.The redistribute command should be configured under OSPF to take routes from EIGRP into OSPF.
- Answer & Explanation
- Report
Answer : [B and D]
Explanation :
Explanation :
| For a router to redistribute routes between two routing protocols, the router must have both routing protocols configured, have a working link into each routing domain, and configure redistribute commands under each routing process. The redistribute command, issued in routing protocol configuration mode, pulls routes into that routing process from another routing process as referenced on the redistribute command. |
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