The data link layer's primary function is to ensure data is received by the correct device in a network using hardware addresses, called MAC address, and then convert that data into bits for the physical layer to transmit. It also manages error notification, flow control and network topology.Continue Reading
This OSI reference model layer also provides physical transmission of data by formatting messages into small pieces, called data frames, and encapsulates the frames with additional data containing the hardware address of the destination device along with the information of the source device. Every time a data packet is sent between devices, the data link layer frames it with control information, so devices such as routers and gateways can properly forward the data to the correct device.
Routers and switches also work at the data link layer to communicate and uniquely identify devices that are connected to a local network. A typical Ethernet network uses MAC addressing to communicate with devices. Without the data link layer to frame data packets, data broadcasts within a domain are prone to collision that could lead to network traffic congestion and lost data transmissions.
The data link layer resides under layer two on the OSI reference scale and is among the top three layers that define how devices and applications within a network communicate with each other and users.Learn more about Internet & Networking
Network security systems consist of hardware and software components that help protect a network from unauthorized access, misuse or denial of service to networks and their data. Network security components often include anti-virus, anti-malware and anti-spyware software; hardware and software firewalls; intrusion protection systems, or IPS; and virtual private networks, or VPNs. These and other components working in tandem protect the usability, reliability, integrity and safety of a network and its data against an ever-changing array of threats.Full Answer >
To find your default network address in Windows 7, go to the Control Panel, open the Network and Internet link, choose Change adapter settings, and then click on the network connection you want to view. Click on the Details button, and then find the gateway address opposite IPv4 Default Gateway.Full Answer >
The network layer addressing scheme involves assigning a logical address to a network device. The most commonly used network layer protocol for creating these addresses is the Internet protocol, or IP, which typically works in conjunction with the transmission control protocol, or TCP.Full Answer >
The media access control address of an electronic device is the set of characters that uniquely identifies it on a network and it is generally located within the device's network or system settings. The MAC address is a series of six alphanumeric character pairs separated by dashes or colons.Full Answer >