单项选择题

Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above

A．network layer
B．data link layer
C．transport layer
D．application layer
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单项选择题
Software maintenance is to do necessary modification, supplement, and completeness during software life circle. Among the following vary kinds of maintenance, which one has the maximum workload in a general way
A．relevance maintenance
B．completeness maintenance
C．correctness maintenance
D．other kinds of maintenance
单项选择题
计算机网络按照其覆盖的地理范围可以分为的基本类型有 Ⅰ．局域网 Ⅱ．城域网 Ⅲ．数据通信网 Ⅳ．广域网
A．Ⅰ和Ⅱ
B．Ⅲ和Ⅳ
C．Ⅰ、Ⅱ和Ⅲ
D．Ⅰ、Ⅱ和Ⅳ
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