在通信专业中，描述网络模式的缩写词VPN的英文全称是（），“时隙”英文通常翻译为（）。

A communcitions protocal is a set of（）for exchanging information over a network.

A router uses its () to detemine where to forward the packets.

The Internet is a () system of interconnected computer networks that use the standard Internet protocol suits(TCP/IP) to serve several billion users worldwide。

IPv6 is currently in growing deployment around the world,() Internet address registries (RIRs) began to urge all resource managers to plan rapid adoption and conversion.

() switching was invented in the late 1960s for data communications.