Mr Smith will probably fly back to Shanghai at ______.
A. 10:20 am
B. 12:00 pm
C. 2:30 pm
D. 3:10 pm
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Lenny wants to know Mr Smith’s requirements for the conference before December 20th, because ______.
A. he only has one week to prepare for the conference.
B. he has to talk with the hotel to prepare the audio-visual equipment needed
C. he has to buy the facilities on e-shop.
D. he has to negotiate with his General Manager
OSI参考模型中，能实现路由选择，拥塞控制与互联功能的层是（）。
A. 传输层
B. 应用层
C. 数据链路层
D. 网络层
下面属于TCP/IP协议族中网络层协议的是（）。
A. IGMP、UDP、IP
B. IP、DNS、ICMP
C. ICMP、ARP、IGMP
D. RIP、IGMP、SMTP
下列不属于网络协议三要素的是（）。
A. 语音
B. 语法
C. 语义
D. 时序
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