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Which two statements about the DiffServ model are true？ （）

题目
多选题
Which two statements about the DiffServ model are true？ （）
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 addresses.

B

A drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field.

C

DiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）.

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.

参考答案和解析
正确答案： C,B
解析： 暂无解析
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