B is correct
RSPAN allows you to monitor traffic from source ports distributed over multiple switches, which means that you can centralize your network capture devices. RSPAN works by mirroring the traffic from the source ports of an RSPAN session onto a VLAN that is dedicated for the RSPAN session.
I've often wondered why a regular VLAN couldn't be used for RSPAN transport and I could never find any info that clearly stated why. I've done it without configuring the VLAN transport for RSPAN.
I believe though is that an RSPAN VLAN has all the usual VLAN control frames suppressed such as BDUs, DTP, VTP, etc so that only the captures are sent through.
Configuring RSPAN requires a few more steps. You have to configure a dedicated RSPAN VLAN on both the source and destination switches, like so:
vlan 3333 name RSPAN remote-span
in all participating switches -> This VLAN can be considered a special VLAN type
Answer is correct.
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