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.
D. Area 10 must be configured as a standard area.
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It seems A D is correct.
Configure an OSPF virtual link on the remote ABR and specify the transit area 0.0.0.2.
This routing device is not physically connected to the backbone.
[edit protocols ospf area 0.0.0.0]
user@R2# set virtual-link neighbor-id 192.0.2.5 transit-area 0.0.0.2
C and D
Answer is AD
Virtual link must be configure under area.0 on both ends of the link
C & D?
C is not correct, as virtual link requires config on R4 area 0.
https://www.juniper.net/documentation/en_US/junos/topics/example/ospf-virtual-links-configuring.html