1. Application of computer networks
1.1 commercial applications: (1) shared resources --- VPN, C / S model; (2) a communication medium --- IP phones, IP voice, desktop sharing; (3) e-commerce.
1.2 home applications: (1) access to information --- C / S (Client - the remote server), P2P (peer to peer communication, sharing data - Thunder / Cloud) (2) People - human communication (3) e-commerce --- B2C / B2B / G2C / C2C / P2P (4) Entertainment (5) --- pervasive computing things
1.3 mobile users:
2. Network Hardware
1. vs distributed computer network system?
2.tcp three-way handshake https://zhuanlan.zhihu.com/p/86426969