计算机病毒是一种(1)。
(74) is a connectionless TCP/IP transport layer protocol.
(75) is a TCP/IP application service that converts user-friendly names to IP address.
A(72) is a data communication system that allows a number of independent devices to communications directly with each other in a limited geographic area.
(73) is a multimedia Internet service that allows users to traverse the Internet by moving from one document to another via links that connect them together.
In(71), multiple transmission can occupy a single link sectioned by time rather than frequency.
(67)
(68)
(65)
局域网中应用最广泛的差错控制方法是(47)校验。在CRC校验中,假设采用的生成多项式为4阶多项式,它产生的校验码为(48)位。在接收端,若发现错误,则将采取(49)措施。
(64)
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