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问题 单项选择题

EP地址块202.192.33:160/28的子网掩码可写为

A．255.255.255.192

B．255.255.255.224

C．255.255.255.240

D．255.255.255.248

答案

参考答案：C

单项选择题

To a router, a flow is a (1) of packets that share the same characterstics, such as traveling the same (2) , using the same (3) , having the same kind of security, and so on. A router that suppors the handling of flow labels has a (4) table. The table has an entry for each active flow label; each entry defines the (5) required by the corresponding flow label.

3（）

A．source

B．resources

C．route

D．entry
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多项选择题

普通贷记业务包括（）业务种类。

A、汇兑

B、委托收款

C、托收承付

D、银行汇票

E、贷记退汇
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