What are the four layers of the tcp/ip reference model?
a. software, hardware, network interface, internet
b. application, transport, internet, and network interface
c. physical, application, internet, and network interface
d. application, hardware, internet, and network interface
e. physical, application, transport, and network interface

The correct option to the following question is option b.) Application, Transport, Internet, and Network Interface .

Explanation:

Layer-4: Application Layer.

This layer is top most layer in the TCP/IP(Transmission Control Protocol/Internet Protocol) model. It is responsible for the interface functions and the communication protocols which are used in the process to process communication across the IP.   It includes the higher level of the protocols like FTP, HTTP, SNMP, etc.

Layer-3: Transport Layer.

This layer is third layer in the TCP/IP(Transmission Control Protocol/Internet Protocol) model. It is responsible for the 'error free' and 'end to end' delivery of the data from source to the destination host. The main protocol at this layers are UDP and TCP.

Layer-2: Internet Layer.

This layer is second layer in the TCP/IP(Transmission Control Protocol/Internet Protocol) model. It is responsible for the transferring of the data between source computers and the destination computers. The main protocol at this layers are ICMP, IGMP, IP, RARP, etc.

Layer-1: Network Interface Layer.

This layer is first layer in the TCP/IP(Transmission Control Protocol/Internet Protocol) model. It is responsible for the data transmission and it received data across physical network. The main protocol at this layers are token ring, frames relay, Ethernet etc.

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