题目内容

In the strength of the carrier signal is varied to represent binary 1 or 0.
(72) is a system that can map a name to an address and conversely an address to an name.
(73) is a three-way handshaking authentication protocol that it's packets are encapsulated in the point-to-point protocol
(74) is an approach that enables an ATM Switch to behave like a LAN switch.
(75) is an guided media which is made of glass or plastic and transmits signals in the form. of light.

ASK
B. PSK
C. FSK
D. FDM

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A. 物理层、数据链路层、网络层
B. 物理层、数据链路层、传输层
C. 物理层、网络层、表示层
D. 物理层、传输层、表示层

A. touch/var/state/dhcp/dhcpd.1eases
B. address/var/state/dhcp/dhcpd.1eases
C. nat/var/state/dhcP/dhcpd．1eases
D. resolve/var/state/dhcp/dhcpd.1eases

A. 手写签名
B. 数据完整性机制
C. 数字签名机制
D. 加密机制

A. 由客户机和服务器协同完成任务
B. 将应用程序下载到本地执行
C. 在服务器端，每次只能为一个客户服务
D. 许多终端共享主机资源的多用户系统