Learn what is OSI Model, osi reference model or open system interconnection model or networking model including Application Layer, Presentation Layer, Session Layer, Transport Layer, Network Layer, Data Link Layer and Physical layer. Definition, Function and use of OSI network model. Protocols in computer network layers of OSI model. Notes : Facebook : The Data Link layer performs two basic functions: It allows the upper layers to access the media using techniques such as framing. Controls how data is placed and received from the media using techniques such as media access control and error detection. Physical Layer converts received binary sequence into signals and transmit over local media. It can be an electrical signal in case of Copper Cable or LAN cable, Light signal in case of Optical Fibre and Radio signal in case of Air as Local Media. #TechTerms Must learn: DHCP Protocol : ARP Protocol : DNS Explained : OSI Model : IP Address : NIC : Network Protocol : Network Topology: Network Router : Network devices : Firewall : Firewall types : Firewall vs : Firewall working : Firewall limits : Domain name : LAN cable : Hostname :