Category: Networking Fundamentals

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 …

02. Data Link Layer of OSI Model (Layer2)

OSI Model - Data Link Layer, ATech, Waqas Karim

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. Data Link Layer is the second layer in the 7Layer OSI Model after Physical Layer. This is the place where most LAN, Ethernet and wireless LAN technologies are defined. Data Link controls the Layer2 Network boundary. The data link layer provides functional and procedural methods of transferring data between two points. It works like traffic control system which works without concern to their ultimate Read More …

01. Physical Layer of OSI Model (Layer1)

OSI Model - Physical Layer, ATech, Waqas Karim

The 7x Layer model starts from Physical till Application 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. Physical Layer is the first & lowest layer in the 7Layer OSI Model. It is responsible for ultimate transmission of data between sender & receiver. The physical layer defines the means of transmitting raw bits over the transmission media.  It also defines how the data is carried over the Physical media rather than logical data packets over a physical data link connecting network nodes. The Read More …