In short, we can say congestion means traffic in the network occurs due to the availability of extra packets in the subnet.įor example, If we compare the congestion with a real-life example then it would be the same as road traffic which we encounter occasionally while travelling. It is a situation, where the number of packets that a network can carry gets exceed which results in message traffic and thus slows down the data transmission rate. A high degree of cooperation is essential in DTE-DCE combination, as data and control information is to be exchanged.Congestion in Computer Network What is Congestion?Ĭongestion is a state in the network layer that may occur in contrast to the packet switching technique of data transmission. To specify the exact nature of interface between DTE and DCE various standards and protocols have been developed. It interacts with DTE and provides an interface of DTE to communication network transmits and receive bits one at a time over the communication channel. They are not commonly connected directly to transmission medium.ĭCE is used to connect the communication channel.Įxample: modem.

DTE is the end user machine, generally refers to (Devices) terminals and computers.Įxample: Email terminal, workstation, ATM in a bank, sales terminal in a departmental store.

Most digital data processing device have limited data transmission capacity and limited distance of data transmission. – Data circuit terminating Equipment (DCE) concept. They are also known as PACKET SWITCHING NODES, INTERMEDIATE SYSTEM OR DATA SWITCHING EXCHANGES. All traffic to/from the host has to go via its IMP. The purpose of the switching element is to choose outgoing line and forward the data arriving on an incoming line. The switching elements are specialized computers used to connect two or more transmission lines. Transmission lines are also called CIRCUITS, CHANNELS, TRUNKS, move bits between the machines. They carry messages from host and consist of switching elements and transmission lines. The hosts are connected to communication subnet or subnet. Network Stations: May be terminal, computers, telephones or other communication devices. Also the figure show you how the Wireless network Works, the Notebook and the Computer connected with the wireless router by wireless adapters which equipped with them. The printer in this network can be used by all the PCs. You can see that all devices are connected with network cables to a central network device called a Network Router. Above figure shows a simple network with three computers and a Printer.

Computer networking tutorial