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Title: BASIC INTERNET PROTOCOLS: http, ftp, telnet.


1
BASIC INTERNET PROTOCOLS http, ftp, telnet.
  • Mirela Walczak

2
Content
  • Key Words
  • Introduction
  • Internet Protocol Suite
  • Client Server Model
  • OSI Model
  • FTP Protocol
  • HTTP Protocol
  • TELNET Protocol

3
Key Words
  • Port
  • Host
  • Control stream
  • Proxy
  • SSL- secure sockets layer
  • Client
  • Server

4
What is protocol?
Is a convention or standard that controls or
enables the connection , communication and data
transfer between two computing endpoints.
5
Internet Protocols Suite
  • The set of communication protocols used for
    Internet and other similar networks.
  • Internet Protocol
  • IP
  • Transmission Control Protocol TCP

6
OSI Model
OSI
  • The Open Systems Interconnection Reference Model
  • OSI Reference Model
  • OSI Model
  • OSI seven layer model

7
(No Transcript)
8
TCP/IP Model OSI Model
9
Client Server Model
  • Software architecture model distinguishes
    Client system from Server system, which
    communicate over a computer network.

10
The qualities characteristic for
  • Server
  • Passive
  • It waits for the requests from the client
  • When the request is received server process it
    and send an answer to the client
  • Client
  • Active
  • It sends the request to server
  • It is waiting for the answers from the server

11
File Transfer Protocol
  • Is a network protocol used for transfer data
    from one computer to another through a network
    such as Internet.

12
Advantages of FTP
  • FTP operates on two ports 21, 20
  • Provides two different transfer mode
  • Active client mode
  • Passive server mode
  • Servers can have anonymous FTP access
  • Two formats on which data can be send
  • ASCII mode-American Standard Code for
    Information
  • Interchange
  • BINARY mode

13
ASCII mode
BINARY mode
14
Disadvantage of FTP
  • FTP is a high latency protocol for e.g to begin a
    transfer of data it has to be used many comands.
  • Passwords and file contents are sent in clear
    text, allowing unwanted eavesdropping.
  • It is possible to tell a server to send data to
    an arbitrary port of a third computer.

15
The objectives of FTP
  • To promote sharing of files (computer programs
    and/or data).
  • To encourage indirect or implicit use of remote
    computers.
  • To shield a user from variations in file storage
    systems among different hosts.
  • To transfer data reliably, and efficiently.

16
HyperText Transfer Protocol
  • Is a communication protocol for the transfer
    of information on the Internet.

17
Offices of the current Internet Engineering Task
Force Secretariat
World Wide Web Consortium World Wide Web Consortium

Type Consortium
Founded October 1994
Founder Tim Berners-Lee
Headquarters MIT/CSAIL in USAERCIM in FranceKeio University in Japanand many other offices around the world
Website www.w3.org -- History
18
HTTP request method
  • HEAD-Asks for the response identical to the one
    that would correspond to a GET request, but
    without response body.
  • GET-Requests a representation of the specified
    resource.
  • POST-Submitt data to be processed (e.g. from a
    HTML form) to the identified resource.
  • PUT-Uploads a representation of the specified
    resource.
  • DELETE-Deletes the specified resource.
  • TRACE-Echoes back the received request, so that a
    client can see what intermediate servers are
    adding or changing in the request.
  • OPTIONS-Returns the HTTP methods that the server
    supports.
  • CONNECT-For use with a proxy that can change to
    being an SSL tunnel.

19
HTTP Versions
  • HTTP/0.9
  • Support only one command GET and omits the
    header.
  • HTTP/1.0
  • This is the first protocol revision to specify
    its version in communications.
  • HTTP/1.1
  • Current version with persistent connection.
  • Allows pipelining and multiple request at
    the same time.
  • Works well with proxies
  • HTTP/1.2
  • Version from the 1995, later subsumed by the
    experimental HTTP Extension Framework

20
Telecommunication Network Protocol
  • Is a network protocol used on the Internet or
    local area network (LAN) connections.

21
TELNET security
  • Three main reasons why ..........?
  • Does not encrypt any data sent over the
    connection (including passwords).
  • Does not ensure that communication is carried out
    between the two desired hosts, and not
    intercepted in the middle.

22
The packets allow easily obtain login and
password information.
23
Current Status
  • TELNET was replaced by SSH (Secure shell protocol
    with high level of encryption).
  • Popular in enterprise networks to access host
    applications.
  • Is also heavily used for games played over the
    Internet, as well as talkers.
  • Cannot be used as a tunneling protocol.
  • Should not be used on networks with Internet
    connection.

24
SUMMARY
  • PROTOCOLS are very important in successful
    communication.
  • INTERNET PROTOCOL SUITE consist of two protocols
    IP and TCP. They are responsible for transmission
    data.
  • OSI MODEL is an abstract description for layered
    communication and computers network protocol
    design. Consist of 7 seven layers.
  • CLIENT SERVER MODEL is responsible for exchanging
    information between client and server .

25
FILE TRANSFER PROTOCOL
  • There are two computers involved in an FTP
    transfer a server and a client.
  • Any software company or individual programmer is
    able to create FTP server or client software
    because the protocol is an open standard.
  • There are many existing FTP client and server
    programs, and many of these are free.

26
HYPERtext TRANSFER PROTOCOL
  • Its original purpose was to provide a way to
    publish and retrieve HTML pages.
  • Development of HTTP was coordinated by the World
    Wide Web Consortium and the Internet Engineering
    Task Force.
  • HTTP is a request/response protocol between
    clients and servers.
  • HTTP defines eight methods.
  • HTTP versions 0.9, 1.0, 1.1, 1.2

27
TELNET PROTOCOL
  • Name is derived from the words telecommunication
    network.
  • It was developed in 1969.
  • Provides general, bi-directional, 8-bit
    communication.
  • Client-server protocol with port 23.
  • TELNET is not recommended for modern systems from
    the point of view of computer security.

28
Sources
  • http//en.wikipedia.org/wiki/Main_Page
  • http//www.demon.net/helpdesk/technicallibrary/mis
    c/telnet/images/telnet.gif
  • http//www.cyf-kr.edu.pl/mfjawien/FZI/Wstepx1.htm
    l
  • http//www.angelfire.com/ab7/gregsgrl85/ftp.html
  • http//www.cs.rpi.edu/academics/courses/fall96/net
    prog/lectures/html/ftp/tsld002.htm
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