单选题Two Company switches are connected via a trunk link. In this network， the original frame is encapsulated and an additional header is added before the frame is carried over a trunk link. At the receiving end， the header is removed and the frame is forwarded to the assigned VLAN. This describes which technology？（）A DISLB ISLC DTPD IEEE 802.1QE MPLSF None of the other alternatives apply
单选题
Two Company switches are connected via a trunk link. In this network， the original frame is encapsulated and an additional header is added before the frame is carried over a trunk link. At the receiving end， the header is removed and the frame is forwarded to the assigned VLAN. This describes which technology？（）
A
DISL
B
ISL
C
DTP
D
IEEE 802.1Q
E
MPLS
F
None of the other alternatives apply
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