单选题Select a key benefit of DSL.（）ATCP packet sizes can be optimized by the router so there is no IPSec or AAL5 padding.BThe local loop is a dedicated connection for a single subscriber to the DSLAM. CAccess to the WAN media uses a poll/response mechanism so no two subscribers transmit at the same time. DThere are no distance requirements from the Central Office (CO).
单选题
Select a key benefit of DSL.（）
A
TCP packet sizes can be optimized by the router so there is no IPSec or AAL5 padding.
B
The local loop is a dedicated connection for a single subscriber to the DSLAM.
C
Access to the WAN media uses a poll/response mechanism so no two subscribers transmit at the same time.
D
There are no distance requirements from the Central Office (CO).
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