Layer 1 of TCP-IP Protocol Suite
The Physical layer is the first layer of the TCP-IP Protocol suite. The physical layer specifies the physical features of the network’s hardware.
This layer mainly handles the host to host communication in the network. It defines the transmission medium and mode of communication between two devices. The medium can be wired or wireless, and the mode can be simplex, half-duplex, or full-duplex.
Layer 2 of TCP-IP Protocol Suite
The Data-Link Layer is the second layer of the TCP/IP layer. It deals with data in the form of data frames. It mainly performs the data framing in which, it adds some header information to the data packets for the successful delivery of data packets to correct destinations.
The Internet layer or IP Layers is the third layer of the TCP-IP Protocol. The main function of the Internet layer or IP Layers is to send the packets from client to server in a network, and they are irrespective of the routes they take to arrive at the destination host. The protocols at this layer include IP, ARP, ICMP & IGMP.
Layer 3 of TCP-IP Protocol Suite
The Transport layer is the fourth layer of the TCP-IP Protocol. The transport layer establishes communication through connection-oriented sessions and connection-less broadcasts. It is used to deliver the data from one end to another end and it provides a point-to-point connection, that why it is also called as Host-to-Host layer. The protocols at this layer uses TCP & UDP.
Layer 4 of TCP-IP Protocol Suite
The Application layer is the fifth and last layer of the TCP-IP Protocol The application layer is responsible for application-level access to TCP-IP networking services. The application layer includes DNS, DHCP, HTTP, FTP, Telnet, SMTP, SNMP.
Layer 5 of TCP-IP Protocol Suite