POP3服务默认的TCP端口号是______。

【名词&注释】

主设备(main equipment)、销售者(seller)、网络服务(network service)、购买者(buyer)、使用者(user)、TCP端口号、软件开发者(software developer)、著作权属

[单选题]POP3服务默认的TCP端口号是______。

A. 20
B. 25
C. 80
D. 110

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学习资料：

[单选题]●个人根据自己的兴趣业余开发的计算机软件的著作权属于(35)。(35)

A. 销售者
B. 使用者
C. 购买者
D. 软件开发者^{(software developer)}

[多选题]● 当前使用的PC电脑上，一台电脑最多可连接 （1）个IDE设备，启动硬盘应该接在（2）IDE接口上。（1）

A. 1
B. 2
C. 4
D. 6
E. 从 B． 主 C． 副 D． 次

[多选题]_____

A. application
B. transport
C. link
D. Network
E.

[单选题]Flow control is a function that prevents network congestion by ensuring that(66)do not over-whelm(67)with data. There are three commonly used methods for handling network congestion.(68)is used by network devices to temporarily store bursts of excess data in memory until they can be processed.(69)are used by receiving devices to help prevent their buffers from overflowing.(70)is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

A. transmitting devices
B. transmitted devices
C. receiving devices
D. received devices

[单选题]

B． Ctrl+ X C． Ctrl+ V D． Ctrl+ S

A. Ctrl+ CB． Ctrl+ X
B. Ctrl+ V
C. Ctrl+ S

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