Internet Protocol learning record

link : Protocol introduction （ One ）.
link : Protocol introduction （ Two ）.

Ethernet protocol +IP agreement +TCP agreement + Data packets ( Various data type protocols )

Ethernet (Ethernet) agreement

Each device has a unique MAC Address (Media Access Control Address)
Device address , Like an ID card
adopt ARP Agreement obtained from the other party MAC Address

IP agreement (Internet Protocol)

IP Address
Subnet mask (subnet mask)： Determine whether it is in the same subnet , Cover up the subnet address , Keep only the network address （ Subnet mask and IP Address for And operation ）, The operation result determines whether it is under the same subnet

Under the same network , Know each other IP Pass after address ARP Agreement obtained from the other party MAC Address
Different networks , Handle by other methods

TCP agreement (Transmission Control Protocol)

A device has different programs to get the network ,TCP The protocol contains such port information

UDP agreement (User Datagram Protocol)

UDP It doesn't matter if the data is sent out ,TCP It will ensure that the data has been accepted by the other party