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TARGET GATE CSE 2019 unacadem COMPUTER NETWORK APPLICATION LAYER PROTOCOLS (DNS , SMTP , POP , FTP, HTTP)
unacacemy.com/use unaca us Search Courses, Topics &Educators 0 minutes today 1,015 ereits Sweta Kumari Edit Profile Software Engineer IPursuing M.TECH (CSE) ISelected in 2 IT MNC(Java) Research Paper (NCCCS) IQuora Writer 12+ yr Teaching Exp. IYoutuber 11,614 Views in tast 30 days N 50,304 Lifetime Views Courses 3.8k Fallowers 183 Following COMPLETE SYLLABU GATE (CS/IT) DBMS SQL JOINS SOFTWARE ENGINERING Learn WEB SERVICES in 60 Minutes By Sweta Kumari By Sweta Kumari By Sweta Kumari (Hindi) SQL Joins With Tabular Examples - GATE (CS/IT) (Hindi) Complete Software Engineering in 60 Minutes (Hindi) Web Services Tutorial For Beginners in 60 Minutes
APPLICATION LAYER PROTOCOL DEFINES: 1. How application processes (clients and servers), 2. How application running on different end systems, 3. How application pass messages to each other, 4. The types of messages, e.g., Request messages and response messages. 5. The syntax of the various message types, 6. The semantics of the fields, 7. Rules for determining when and how a process sends messages and responds to messages.
APPLICATION-TYPE APPLICATION LAYER PROTOCOL SEND: SIMPLE MAIL TRANSFER PROTOCOL SMTP TRANSPORT PROTOCOL ELECTRONIC MAIL TCP 25 RECEIVE: POST OFFICE PROTOCOL V3 POP TELNET HYPERTEXT TRANSFER PROTOCOL HTTP 1.1 FILE TRANSFER PROTOCOL FTP TCP 110 TCP 23 TCP 80 REMOTE TERMINAL ACCESS WORLD WIDE WEB (WWW) FILE TRANSFER TCP 21 TRIVIAL FILE TRANFER PROTOCOL TFTP Remote file server Streaming Multimedia Internet Telephony NFS Proprietary (e.g. Real Networks) Proprietary (e.g. Vocaltec) UDP 69 TCP OR UDP UDP OR TCP Usually UDP
SMTP (Simple Mail Transfer Protocol) The TCP/IP protocol that supports electronic mail on the Internet is called Simple Mail Transfer Protocol (SMTP) SMTP transfers messages from senders' mail servers to the recipients' mail servers using TCP connections. TCP CONNECTIONS SENDER'S MAIL SERVERS RECIEVER'S MAIL SERVERS
TELNET (Terminal Network): TELNET is client-server application that allows a user to log onto remote machine and lets the user to access any application program on a remote computer TELNET uses the NVT (Network Virtual Terminal) system to encode characters on the local system. .On the server (remote) machine, NVT decodes the characters to a form acceptable to the remote machine. . TELNET is a protocol that provides a general, bi-directional, eight-bit byte oriented communications facility. Telnet services are used on PORT 23.
FTP (File Transfer Protocol) . FTP is the standard mechanism provided by TCP/IP for copying a file from one host to another. HOST 1 (FILE 1) HOST 2 (FILE 1) COPY FILE
HOW FTP IS DIFFERENT? FTP differs form other client-server applications because it establishes 2 connections between hosts . Two connections are: Data Connection and Control Connection. Data Connection(Data Transfer) uses PORT 20 for the purpose and control connection(Commands & Responses) uses PORT 21 for the purpose. Data Connection= 20 HOST 1 (FILE 1) HOST 2 (FILE 1) Control Connection 21
HTTP (Hypertext Transfer Protocol): The HTIP protocol transfer data in the form of plain text, hyper text, audio, video and so on. HTTP utilizes TCP connections to send client requests and server replies. It is a synchronous protocol which works by making both persistent and non persistent connections. TCP CONNECTIONS PLAIN TEXT CLIENT SERVER AUDIO VIDEO
TFTP: TRIVIAL FTP The Trivial File Transfer Protocol (TFTP) is the stripped-down, stock version of FTP, but it's the protocol of choice if you know exactly what you want and where to find it. . It's a technology for transferring files between network devices, and is a simplified version of FTP.
LPD It stands for Line Printer Daemon It is designed for printer sharing. It is the part that receives and processes the request. A "daemon" is a server or agent.
X window: It defines a protocol for the writing of graphical user interface-based client/server applications. The idea is to allow a program, called a client, to run on one computer. It is primarily used in networks of interconnected mainframes.
SNMP It stands for Simple Network Management Protocol It gathers data by polling the devices on the network from a management station at fixed or random intervals, requiring them to disclose certain information It is a way that servers can share information about their current state, and also a channel through which an administer can modify pre-defined values
Consider different activities related to email: m1: Send an email from a mail client to a mail server m2: Download an email from mailbox server to a mail client m3: Checking email in a web browser GATE CS 2014 Which is the application level protocol used in each activity? (A) m1: HTTP m2: SMTP m3: POP (B) m1: SMTP m2: FTP m3: HTTP (C) m1: SMTP m2: POP m3: HTTIP (D) m1: POP m2: SMTP m3: IMAP
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