Category: TCP/IP & OSI Models

07. Application Layer of OSI Model (Layer7)

OSI Model - Application Layer, ATech, Waqas Karim

The last layer of OSI Model, the Application Layer is responsible for End user Network Applications. It is the 7th & highest Layer in the 7Layer OSI Model. This is the layer where real traffic data is generated in most of the cases. This could be a web request generated from HTTP protocol, a command from telnet protocol, a file download request from FTP protocol etc. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. The 7x Layer model starts from Physical till Read More …

06. Presentation Layer of OSI Model (Layer6)

OSI Model - Presentation Layer, ATech, Waqas Karim

As the name points, Presentation Layer is responsible for representation & formatting of data for session Layer in Encapsulation Process. It is the 6th Layer in the 7Layer OSI Model after Session Layer. It serves like a translator & takes care that the data is sent in such a way that the receiver will understand the information/data and will be able to use the data. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. The 7x Layer model starts from Physical till Application Read More …

03. Network Layer of OSI Model (Layer3)

OSI Model - Network Layer, ATech, Waqas Karim

Network Layer is the 3rd layer in the 7Layer OSI Model after Data Link Layer. This is the place where most Routing and network stuff resides. It controls the Logical boundaries of Network. Most of the students confuse Layer2 & Layer3. There is a basic difference b/w Network Layer & Data Link Layer. Network Layer is concerned with data transfer from one computer to another computer even if it is on a remote network, while the data link layer only deals with devices that are local to each other & are within one network. PDU at Data Link Layer is Read More …

04. Transport Layer of OSI Model (Layer4)

OSI Model - Transport Layer, ATech, Waqas Karim

Transport Layer is the fourth layer in 7Layer OSI Model after Network Layer. Similar to L2 & L3, this layer also performs addressing & multiplexing … but at Transport Layer. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. The 7x Layer model starts from Physical till Application Layer. The core concept behind Transport is “support of Multitasking” … it allows same computer, browser & internet connection to work on multiple applications simultaneously … & this is achieved through Port Numbers, Transport Layer Read More …

05. Session Layer of OSI Model (Layer5)

OSI Model - Session Layer, ATech, Waqas Karim

As obvious from the name, this layer is designed to allow devices to establish and manage sessions so that multiple channels could be established b/w same terminals. Session Layer is the 5th layer in the 7Layer OSI Model after Transport Layer. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. The 7x Layer model starts from Physical till Application Layer. Session Layer is also called as port layer. The main function of Session Layer is to establish, maintain and synchronize the interaction between Read More …