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Web Directory: A directory is a method of organizing sites by category. Typically the directory structure is created and sites are reviewed and entered into the appropriate categories by humans. The two largest directories on the Internet are The Open Directory (ODP) and the Yahoo Directory.
It is the simplest though unrealistic protocol with the nickname “UTOPIA“. In this case, data is transmitted in one direction only. Both the transmitting and receiving Network Layer are always ready and the proceeding time can be ignored. Infinite buffer space is available and also communication between a Data Link Layer never damages or loses frames.
Networks can be divided into two categories i.e., those using point-to-point connections and those using broadcast channels. Broadcast channels are sometimes referred to as multi-access channels or random access channels. The protocols used to determine who goes next on a multi-access channel belong to a sublayer of the data link layer called the MAC (Medium Access Control) sublayer. The MAC sublayer is especially important in LANs, nearly all of which use a multi-access channel to communicate. WAN, in contrast, uses point-to-point links except for satellite networks.
Transmission modes is the way data flows from the source to the destination. There are three modes of data transmission. Data can be transmitted in any one of them. These are as follows:-
For data transmission various methods are used:-
Synchronous Transmission
This method of data transmission involves block of characters that are transmitted at regular time sequences. Each of the block of characters is marked with synchronization characters. The receiving end, accepts the data block, till it detects the ending character or after a predefined number of characters are received, indicating end of a message.
In computer networks, multiplexing is used to refer to a process where multiple channels are combined together to form a single bandwidth, and is transferred across the communication media. As we have cable in t.v. which gives plenty of channels in a single wire. This technique helps in making the transmission more inexpensive by transmitting the expensive signals. The device which perform this task is known as Multiplexer ( MUX ). So, it reveals that the multiplexing is a process of combining many channels in to one single bandwidth.
Data is transferred from the source to the destination in a network. Sometimes the data is transferred in bulk in the network which affects the traffic. Now, if the traffic gets more and more in the network, therefore increasing the congestion. This leads to delay in data receiving or sending packet loss, and blocking of the connection resulting in the capacity of the network.
Network Congestion:- Network protocols are there which help in reducing the network traffic, by taking the SHORTEST PATH ALGORITHM which says that, the data is routed by seeing the shortest path of the desired destination.