单选题 TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines (73) that applications need — like the ability to transfer a file in the case of HTTE In short, the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

单选题 A. application B. transport C. link D. network
【正确答案】 A
【答案解析】
单选题 A. hardware B. software C. packet D. equipment
【正确答案】 B
【答案解析】
单选题 A. services B. processes C. applications D. address
【正确答案】 A
【答案解析】
单选题 A. iteration B. object C. interface D. activity
【正确答案】 C
【答案解析】
单选题 A. application B. session C. physical D. transport
【正确答案】 D
【答案解析】[解析] TCP/IP传输层协议为运行在计算机上的应用软件提供服务。应用层没有定义应用本身，而是定义了应用需要的服务，例如采用HTTP可以传输文本。简而言之，应用层提供了运行在计算机上的软件与网络之间的接口。TCP/IP应用层包括了很多的协议，HTTP仅是其中之一。TCP/IP传输层主要由两个可选的协议组成——传输控制协议(TCP)和用户数据报协议(UDP)。