In a network based on the TCP / IP protocol stack, all OSI layer 2 protocols work with IP at OSI layer 3. However, the actual Layer 2 protocol used depends on the logical network topology and the physical transmission medium.
Each protocol controls media access for the specified Layer 2 logical topologies. This means that when these protocols are implemented, a variety of different network devices can be used as nodes acting on the link layer. These devices include network cards on computers and interfaces on routers and Layer 2 switches.
The Layer 2 protocol used for a particular network topology is determined by the technology used to implement that topology. This technology, in turn, is determined by the size of the network (in terms of the number of nodes and territory) and the services provided on that network.
LANs typically use technologies that provide high bandwidth and support a large number of nodes. The relatively short length of local networks (within the same building or complex of buildings) and the high density of users ensure the feasibility of using this technology.
However, the use of high-bandwidth technology for wide area networks (such as cities or entire regions) is usually impractical. Due to the high cost of long-distance physical links and the technologies used to transmit signals over long distances, the throughput of such networks is usually much lower.
As a rule, the difference in the bandwidth of local and global networks leads to the fact that they use different protocols.
Link layer protocols include:
Ethernet802.11 wireless networkPoint-to-Point Protocol (PPP)HDLCFrame Relay Protocol
For more information about: ccna wireless salary