In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. To a router,

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问题 In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
To a router, a flow is a(71)of packets that share the same characterstics, such as traveling the same(72), using the same(73), having the same kind of security, and so on. A router that supports the handling of flow labels has a(74)table. The table has an entry for each Active flow label; each entry defines the(75)required by the corresponding flow label.

选项 A、quality
B、Traffic
C、services
D、route

答案C

解析根据上下文意思，此处是指服务。选择C

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