Role Of Data Link Layer On the Internet.

Hello friends, In this blog post(Role Of Data Link Layer On the Internet) I am going to let you know about the role of the data link layer on the internet.

The internet consists of individual machines(hosts and routers), and the communication infrastructure that connects them|Role Of Data Link Layer On the Internet|

LANs are widely used for interconnection within a single building, but most of the wide-area infrastructure is built up from point-to-point leased lines|Role Of Data Link Layer On the Internet|

Point-to-point communication is primarily used in two situations. First, thousands of organizations have one or more LANs, each with some number of hosts(personal computers, user workstations, servers, and so on) along with a router(or a bridge, which is functionally similar)|Role Of Data Link Layer On the Internet|

Often, the routers are interconnected by a backbone LAN. Typically, all connections to the outside world go through one or two routers that have point-to-point leased lines to distant routers.

It is these routers and their leased lines that make up the communication subnets on which the internet is built.

The second situation where point-to-point lines play a major role on the internet is the millions of individuals who have home connections to the internet using modems and dial-up telephone lines.

Usually, what happens is that the user’s home PC calls up an internet provider, which includes commercial companies like America Online, CompuServe, and the Microsoft network, but also many universities and companies that provide home internet connectivity to their students and employees.

Sometimes the home PC just functions as a character-oriented terminal logged into the internet service provider’s time-sharing system.

In this mode, the user can type commands and run programs, but graphical internet services, such as the World Wide Web, are not available. This way of working is called having a shell account.

datalink layer and internet host
Home PC Acting As An Internet Host: Role Of Data Link Layer On the Internet

Alternatively, the home PC can call an internet service provider’s router and then act like a full-blown internet host.

This method of operation is no different than having a leased line between the PC and the routers, except that the connection is terminated when the user ends the session.

With this approach, all internet services, including the graphical ones, become available. A home PC calling an internet service provider is shown in fig 1.

For both the router-router leased line connection and dial-up host-router connection, some point-to-point data link protocol is required on the line for framing, error control, and the other data link layer functions.

Two such protocols are widely used on the internet, SLIP, and PPP.

What are the five duties of the data link layer?

  • The data link layer provides the service to the network layer.
  • The data link layer does the frame synchronization.
  • Flow control – Control the speed of data.
  • Error control – Control the error in the network.
  • Addressing – Addressing is done by the data link layer.

What are data link layer protocols?

The work of data link layer protocols is error control, flow control, retransmission, and random access.

The main protocols of the data link layer are Ethernet, Token ring, FDDI, and PPP|Role Of Data Link Layer On the Internet|

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