Click the Exhibit button. Referring to the exhibit, you want to ensure that routers in Area 20 can connect to routers in Area 0. Which two steps must be done to allow this behavior? (Choose two.)
A.
A virtual link must be configured under R2 Area 0 and R4 Area 0.
B.
Area 10 must be configured as a stub area.
C.
A virtual link must be configured under R2 Area 0 and R4 Area 20.
There are the options
A. A virtual link must be configured under R2 Area 0 and R4 Area 0.
Why do we need a virtual link for two routers under the same area? This option simply does note make sense, if this two routers are in the same area they will be able to communicate by other means.
B. Area 10 must be configured as a stub area.
If area 10 were configured as stub then the virtual link will not work.
C. A virtual link must be configured under R2 Area 0 and R4 Area 20.
We need to connect an area that is not directly connecting to Area 0 that traverses other area (area 10), so this option will be the correct.
D. Area 10 must be configured as a standard area.
This option is needed
Answer CD
There are the options
A. A virtual link must be configured under R2 Area 0 and R4 Area 0.
Why do we need a virtual link for two routers under the same area? This option simply does note make sense, if this two routers are in the same area they will be able to communicate by other means.
B. Area 10 must be configured as a stub area.
If area 10 were configured as stub then the virtual link will not work.
C. A virtual link must be configured under R2 Area 0 and R4 Area 20.
We need to connect an area that is not directly connecting to R0 that traverses other area, so this option will be the correct.
D. Area 10 must be configured as a standard area.
This option is needed
Answer CD
Answer is A and D. Routers be Area border route and Virtual Link cannot pass through Stub Area. https://www.juniper.net/documentation/en_US/junos/topics/topic-map/configuring-ospf-areas.html#id-example-configuring-ospf-virtual-links-to-connect-noncontiguous-areas
It is AD, ignore below comment,
so A virtual link must be configured under R2 Area 0 and R4 Area 0.
reference:
https://www.juniper.net/documentation/en_US/junos/topics/topic-map/configuring-ospf-areas.html#id-example-configuring-ospf-virtual-links-to-connect-noncontiguous-areas
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