正确答案:

题目：同轴电缆分为粗同轴电缆和细同轴电缆两种，计算机网络中所使用的一段粗同轴电缆的最大长度为（）米，一段细同轴电缆的最大长度为（）米。

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学习资料的答案和解析：

[单选题]SMTP是（）

C、发信的协议

[单选题]The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for （71） in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP （72） Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same （73） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （74） ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete （75） for existing IPv4 applications.

C．Unix

[单选题]共享介质局域网是基于（）技术。

[单选题]一台PC机通过调制解调器与另一台PC机进行数据通信，其中PC机属于（）。

[单选题]Ping使用的是TCP/IP中的哪个协议（）。

互连网控制报文协议（ICMP）

[单选题]DHCP（）报文的目的IP地址为255.255.255.255

DhcpDiscover

[单选题]下列关于DHCP服务的叙述中，正确的是（）。

在Windows客户机上可使用ipconfig/release释放当前IP地址