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问题 单项选择题

由各网桥自己来决定路由，局域网上各站不负责路由选择的是______。

A．802.1

B．802.2

C．802.4

D．802.5

答案

参考答案：A

解析： 802.1标准的网桥是透明网桥，802.5标准的是源路选网桥。

单项选择题 案例分析题

男，34岁。反复腹胀、腹痛3个月，加重15天，体重较病前下降15kg。查体：消瘦，贫血貌。上腹部压痛，轻度肌紧张，无反跳痛，肠鸣音弱。肝功能检查：白蛋白24g／L，血常规：Hb72g／L。尿常规：正常，大便常规：隐血试验（+）。

进一步检查应该考虑（）

A.全腹CT

B.腹部碘水造影

C.剖腹探查手术

D.内科保守治疗

E.纤维结肠镜检查
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单项选择题

TCP/IP (1) layer protocols provide services to the application (2) running on a computer. The application layer does not define the application itself, but rather it defines (3) that applications need — like the ability to transfer a file in the case of HTTE In short, the application layer provides an (4) 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 (5) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

1（）

A.application 

B.transport 

C.link 

D.network
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