Table of contents
network level
common equipment
Layer introduction
data link layer
With the MAC address. The data link layer works in the local area network , and transmits and processes data in units of frames.
Network layer
The network layer has IP. Different networks are connected by a router to become the Internet
Functions of the router:
1. Network interconnection, the router supports various LAN and WAN interfaces, and is mainly used for interconnecting LAN and WAN to realize communication between different networks; 2. Data
processing, including packet filtering, packet forwarding, priority, Multiplexing, encryption, compression and firewall functions;
3. Network management, routers provide functions including configuration management, performance management, fault tolerance management and flow control.
The following routers are also the most exposed to ordinary people:
transport layer
IP:PORT: ip+port constitutes a process
application layer
The most direct contact of ordinary people is the application layer
