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C is the correct answer:
"
For virtual routers, you can accomplish this task using either a logical tunnel interface or by looping two interfaces together with a single cable.
For virtual switches, this process works only using the external cable method.
"
C.
For virtual routers, you can accomplish this task using either a logical tunnel interface or
by looping two interface with a single cable.
For virtual switches, this works only using external cable. Reason is spanning tree
protocols do not function properly. Because all virtual switches use the same MAC
address as part og their bridge ID in BPDUs. Virtual switch’s mac cannot be changed
At some point you might want to interconnect the virtual routers and virtual switches that are local to a single chassis. For virtual routers, you can accomplish this task using either a logical tunnel interface or by looping two interfaces together with a single cable. For virtual switches, this process works only using the external cable method.
The answer should be "A"
routing instane has instance-type, Virtual switch.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/layer-2-virtual-switch-instances.html
The question is on how to connect two virtual switch instances. There are two methods: for layer 3, configure irb interface; for layer 2, connect physically. I'd go C
upvoted 4 times
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