Computer Network-Basic Knowledge 01

[How to find the target host in the network]

Logically: 
　　host name - "Name"; Host: individual PC, server; 
　　ip address - "Identity Card"; local, local area network (non-networked), the Internet's 
　　port number - "a service on a computer identification program " 

Physical communication: 
　　MAC address;

 

[Network data transmission / network communication-specific study "computer network"]

[Application layer] 
　　
　　Protocol: http / https; ssh; DNS; FTP; Email protocol SMTP, Telnet 

[Transport layer] 

　　Protocol: TCP / UDP