URL to access the Web site process (three handshake, four waves), send RST packet four cases, common protocol

URL Access website (three handshake, four waves)

1) to obtain the corresponding IP address of the domain name, if there is no relevant data in the DNS cache, IE will issue a DNS request to the DNS server to obtain the corresponding IP address of the domain name.

2) Internet Explorer and domain name address to establish a TCP connection, three times handshake

3) HTTP access

4) Disconnect the TCP connection and wave four times

Four scenarios for sending RST packs

1) port not open 2) Request Timeout 3) Early shutdown 4) receive data on a closed socket

Common protocols

1) The ARP protocol finds the corresponding IP address based on the MAC address

2) RARP protocol to find the corresponding MAC address based on IP address

3) NAT protocol translates the IP address of the public network into the IP address of the private network

4) ICMP protocol is used to control the error condition in datagram transmission

5) DHCP protocol centrally manage IP address assignment in the network