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Network Protocols and SDLC

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Added on  2021-02-19

Network Protocols and SDLC

   Added on 2021-02-19

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NETWORK PROTOCOLSAND SDLC1
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IntroductionNetwork protocols can be defined as formal policies and standards comprised of rules,formats and procedures that help in communication defining between more than two devicesover a network. Network protocols are mostly used to govern end to end process, secure andtimely management of data and network communication. This assignment will focus on networkprotocols and SDCL. In this assignment brief discussion of 3-way handshake in TCP, RAD.Disadvantages and advantages of RAD, disadvantages and advantages of agile methods, scopecreep in software development and fact-finding techniques.1. Explain need of 3-way handshake in TCP?In TCP, two parties involved in a communication, keep a track of their communication usingsequence numbers. 3-way handshake in TCP is a method which is used for server and local hostconnection. In this method both server and client need to exchange ACK and SYN packetsbefore beginning any actual data communication. 3-way handshake provides basic spoofingprotection, stale packet protection and reliable transmission. 3-way handshake is preferred moreas compared to 2-way handshake because it helps in proving reliable and protectedcommunication between two parties. There are many drawbacks of 2-way handshake but one ofthe biggest drawback is that is any message or acknowledgement is lost then other party is notinformed about it. But3-way handshake helps in overcoming this drawback and works in threesteps, such as: Node at client side sends a SYN data packet to server over a network. This packetmainly focuses on asking the server whether they are open for a new connection or not. Target server checks whether they can accept or initiate new connections by checkingavailability of new ports and when they receive SYN from the client, they respond to thedata packet and send a conformation receipt (SYN/ACK packet/ ACK packet) back tothe client.When the client node receives ACK/SYN from the server, they again respond to theserver with an Ack data packet.Only after this process both client and server communicate. It helps in establishing a reliablecommunication between both the parties i.e. if the SYN data packet get lost then client can sendan ACK to the server that they have not received the response data packet so that server can sendthe data packet back. But in 2-way handshake client does not send any ACK data packet against3
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