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TCP/IP small explanation - vijay2020 - 10-04-2017 TCP/IP [attachment=17072] Application layer The function of this layer generally is to sand and receive the data. We will explain some applications. 1- DHCP port no.67 This program assign dynamic IP's "pc address" to The hosts instead of static IP's. 2- Web port no.80 This program publishes the web sites. So that the Web client programs like internet explorer can Request the web sites from web servers. 3- DNS port 53 Mapping from hostname to IP address 4- FTP port 21 Used for file transfer 5- SMTP port 25 Used for sending mail 6- POP3 port 110 Used for receive mails. 7- telnet port 23 Used for remote login. Host to host layer 1> transmission control protocol "TCP" Features Connection setup by 3- way handshaking 1. connection oriented protocol data transfer connection release by 4- way hand shaking 2. reliable protocol Internet layer IP protocol receive segment or datagram then it add IP header which contain source IP and destination IP and protocol number " 6 TCP & 17 udp". The data now called packet. Network access layer The common protocol in this layer is Ethernet. Which add MAC header and trailer. The MAC headers contain source MAC and destination MAC. |