PSTN (public switched telephone network) consists:
举一反三
- 局域网和广域网,因采用不同的协议,形成了不同的网络拓扑结构,也形成了不同类型的网络,典型的有:①以太网(Ethernet),②PSTN(Public Switched Telephone Network),③DDN专线(Digital Data Network),④令牌环网(Token Ring), ⑤ISDN(Integrated Service Digital Network),⑥令牌总线网(Token Bus),⑦ADSL(Asymmetric Digital Subscriber Line);下列分类正确的是_____。
- 中国大学MOOC: 局域网和广域网,因采用不同的协议,形成了不同的网络拓扑结构,也形成了不同类型的网络,典型的有:①以太网(Ethernet),②PSTN(Public Switched Telephone Network),③DDN专线(Digital Data Network),④令牌环网(Token Ring), ⑤ISDN(Integrated Service Digital Network),⑥令牌总线网(Token Bus),⑦ADSL(Asymmetric Digital Subscriber Line);下列分类正确的是_____。
- The WDM transmission network consists of three layers: Physical Layer、Data Link Layer and Network Layer.
- A network protocol consists of three elements: syntax, semantics and synchronization.( )
- A network protocol consists of three elements: syntax, semantics and synchronization.( ) A: 正确 B: 错误