CMS专题
多选题What are two reasons for using a virtual link in OSPF?（）AProvides fast convergence times.BSupports connections of multiple backbones.CEliminates the need for a Designated Router.DSupports non direct connections to the backbone.
题目
Provides fast convergence times.
Supports connections of multiple backbones.
Eliminates the need for a Designated Router.
Supports non direct connections to the backbone.
相似问题和答案
第1题：
A. Provides fast convergence times.
B. Supports connections of multiple backbones.
C. Eliminates the need for a Designated Router.
D. Supports non direct connections to the backbone.
第2题：
Open Shortes t Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) working group of the Internet Engineering Task Force (IETF).Which two statements best describe the OSPF link - state routing pro tocol?（）
A. OSPF sends updates every 10 seconds
B. OSPF sends triggered updates when a network change occurs
C. When a link state is changed, the router that detected the change creates a link - state advertisement (LSA) and propagates it to all OSPF devices using the 224.0.0.6 multicast address
D. OSPF sends summaries of individual link- state entries every 30 minutes to ensure LSDB synchronization
第3题：
A. Takes the metric of the outgoing interface.
B. Uses the metric that is assigned during configuration.
C. Uses the path metric to reach the virtual link neighbor.
D. Uses a default of zero unless otherwise specified.
第4题：
When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers?（）
- A、OSPF process ID
- B、OSPF router ID
- C、OSPF network type
- D、OSPF memory usage
- E、OSPF CPU utilization
- F、OSPF stub area configurations
正确答案:B
第5题：
If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）
- A、A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
- B、A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
- C、A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
- D、A SHAM link is part of OSPF network of MPLS-VPN provider
正确答案:A,B
第6题：
A. OSPF process ID
B. OSPF router ID
C. OSPF network type
D. OSPF memory usage
E. OSPF CPU utilization
F. OSPF stub area configurations
第7题：
Refer to the exhibit. During the process of configuring a virtual link to connect area 2 with the backbone area, the network administrator received this console message on R3:*Mar 1 00:2 5:01.084: %OSPF -4- ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0 .How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?（）
A.R1(config - router)# area 0 virtual - link 1.1.1.1R3(config - router)# area 2 virtual - link 3.3.3.3
B.R1(config - router)# area 1 virtual - link 2.2.2.2 R3(config - router)# area 1 virtual - link 2.2.2.2
C.R1(config - router)# area 1 virtual - link 20.20 .20.2 R3(config - router)# area 1 virtual - link 30.30.30.2
D.R1(config - router)# area 1 virtual - link 30.30.30.3 R3(config - router)# area 1 virtual - link 20.20.20.1
E.R1(config - router)# area 1 virtual - link 3.3.3.3 R3(config - router)# area 1 virtual - link 1.1 .1.1
第8题：
A.
B.
C.
D.
第9题：
Which two features prevent routing loops between the OSPF sites of a customer when the sites aremultihomed or a backdoor link is used between the sites？ （）
- A、sham link
- B、down bit
- C、virtual link
- D、Site of Origin
- E、domain tag
正确答案:B,E
第10题：
Several links have been broken so th at for the next day or two, what was formerly a contiguous area 0 has been broken into two parts. However, both parts of area 0 have working links into area 1 using routers with RID 1.1.1.1 and 2.2.2.2. Which answers list the command on the router with RID 1.1.1.1 to create a virtual link to help solve this temporary problem?（）
- A、area 0 virtual - link 2.2.2.2
- B、area 1 virtual - link 2.2.2.2
- C、area 0 source - rid 1.1.1.1 dest - rid 2.2.2.2
- D、virtual - link transit - area 1 RID 2.2.2.2
正确答案:B