多选题
Which two statements about the DiffServ model are true？（）
发布日期：2021-09-16
A
a class can be identified as a single application， multiple applications with similar service needs，or be based on the source or destination IP address
B
a drawback of the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）
C
DiffServ uses the DiffServ field in the MAC header to mark frames into behavior
D
the DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field
E
the first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value
F
the primary goal of DiffServ is scalability
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