Category Archives: Computer Networks

Local Area Network (LAN) Technologies.

Local Area Network (LAN) is a data communication network connecting various terminals or computers within a building or limited geographical area.The connection among the devices could wired or wireless. Ethernet, Token Ring and Wireless LAN using IEEE 802.11 are examples of standard LAN technologies. Ethernet :- Ethernet LANs consist of network nodes and interconnecting media… Read More »



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Simple Mail Transfer Protocol (SMPT)

Email is emerging as the one of the most valuable service in internet today. Most of the internet systems use SMTP as a method to transfer mail from one user to another. SMTP is a push protocol and is used to send the mail whereas POP (post office protocol) or IMAP (internet message access protocol)… Read More »



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DNS (Domain Name Server) | NetWorking.

DNS is a host name to IP address translation service. DNS is a distributed database implemented in a hierarchy of name servers. It is an application layer protocol for message exchange between clients and servers. Requirement Every host is identified by the IP address but remembering numbers is very difficult for the people and also… Read More »



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Sliding Window Protocol | Set 2 (Receiver Side)

Please refer this as a prerequisite article. Sliding Window Protocol (sender side)| set 1 Sliding Window Protocol is actually a theoretical concept in which we have only talked about what should be the sender window size (1+2a) in order to increase the efficiency of stop and wait arq. Now we will talk about the practical… Read More »



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Sliding Window Protocol | Set 1 (Sender Side)

Prerequisite : Stop and Wait ARQ The Stop and Wait ARQ offers error and flow control, but may cause big performance issues as sender always waits for acknowledgement even if it has next packet ready to send. Consider a situation where you have a high bandwidth connection and propagation delay is also high (you are… Read More »



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Differences between Virtual Circuits & Datagram Networks

Computer networks that provide connection-oriented service are called Virtual Circuits while those providing connection-oriented services are called as Datagram networks. For prior knowledge, the Internet which we use is actually based on Datagram network (coonectionless) at network level as all packets from a source to a destination do not follow same path. Let us see… Read More »



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