Naveed Arshad BE(EE-5)APCOMS

AGENDA F T P

Telnet

Secure Shell

F T P B A S I C SFTP stand for File Transfer ProtocolFTP is the simplest way to exchange

file over the internet. Whether you know it or not, you most likely use FTP all the time

FTP depends on TCP(Port No.20 For Data & 21 for Connection Dialog, which is Connection Oriented and provides reliable control.

F T P O B J E C T I V E S

To promote the sharing of files

Hide personal user data from other users

To transfer data reliability and efficiently

F T P F E A T U R E SMultiple file transfer

Resuming feature

Scheduling Utility

Synchronizing directory structure

F T P S I T E

An FTP site is like a filing cabinet. With a traditional filing cabinet.

They also decide which files to keep locked and which remain public.

The virtual ‘key’ to get into an FTP site is the UserID and Password

To make an FTP connection you can use a standard Web browser or a dedicated FTP software program, referred to as an FTP ‘Client’.

Example FTP site address: ftp://ftp.gohere.com

http://www.google.com

F T P S E R V E R

Unless you have your FTP site outsourced you’ll need a computer with adequate storage space for your FTP site. This computer will become your FTP server and, similar to a Web server, will need a constant connection to the Internet (i.e. a T1 Cable, DSL or ISDN(Integrated Services Digital Network) connection). This computer may or may not be the same computer that hosts your Website.

Along with a constant connection, you’ll need a ‘static IP address’. An IP (Internet Protocol) address is a numeric Internet address for your computer. It is a set of four numbers(4 Bytes)

You will also need FTP server software which allows you to serve files over the Internet, much like a Web server software that allows you to serve Web pages.

There are a number of options when choosing FTP server software. The server that is best for you depends on your computer’s operating system and how many people you expect to access your FTP site.

F T P C L I E N T S

An FTP client is software designed to transfer files back-and-forth between two computers over the internet.

It needs to be installed on your computer and can only be used with a live connection to the internet.

The classic FTP Client look is a two-pane design. The pane on the left displays the files on your computer and the pane on the right displays the files on the remote computer.

A D V A N T A G E S FTP support windows xp so there is no need to

install additional software FTP is TCP/IP connection so it is mostly access by

simple web browser Provide separate space for storing the information

other then hard disk. It is efficient and reliable

DISADVANTAGES

On FTP server you need to pay for disk space and it is v.coastly & coast per MB.

Most of them are not good so data can be courted, So need to backup the data.

No technical support available.Also insecure because data is in text form. In LAN security is basic need so there exits

firewall, so firewall also restrict user to get his data, so in such case NWT ADMIN must modify the firewall rules for each user.

NWT ADMIN must know which user is compatible or not with FTP server.

T E L N E T

Stand for Telecommunication Network

Network protocol used on Internet or lan communication using UDP port

Commonly port used by telnet is Port 23

Syntax of telnet is: telnet {Host ID} Port No.

OBJECTIVEIt was design before 1970At that time hard drives were very

costly and having very small spaceAlso internet facility was not

availableSo it was design for communication

over small area and for using recourses

FEATURES

Easily troubleshooting and configuring remote computer

Handle also large network easily

Also provide communication between different operating system

TELNET SERVER

Telnet servers give users the ability to log on to a host computer

Perform tasks as if they're actually working on the remote computer itself.

Users can access the host through the telnet server from anywhere in the world.

The second type of server offered in this section is the WAIS server

TELNET CLIENTS When Telnet Server is running on a computer, users

can use Telnet clients to connect to it from remote computers

When a Telnet client connects to a computer running Telnet Server, the remote user is asked to enter a user name and password.

Once logged on, a user is given a command prompt Telnet Server supports a maximum of two Telnet

clients at a time. However, the administrator can change this value by using the tlntadmn command

If a group with that name exists on your server, only that group's members can log on to Telnet Server.

ADVANTAGESThe big advantage is that it save you

connect to other PC in the worldSo you can play games, trouble

shoot even search each drive without leaving your seat

It is fastIt is cheapRun at all PC

DISADVANTAGESTelnet provide no colors and

graphics.

It also does not support mouse

Does not give us security between communication

S S H

It is abbreviation of Secure ShellMost secure way to communicate with

networkIt is design to replacement of telnet and

other insecure remort shell.Uses standard tcp port no. 22.Mostly used to login to remort machine

and execute commands, but also use for secure file transfer protocol(SFTP) and secure copy protocol(SCP)

S S H

It comes in two version. SSH1, SSH2Ssh1 & Ssh 2 work for commercially

and publically available clients.

MERITSIt save user from IP spoofing

Secure IP Source Routing

Protect DNS Spoofing

In other work ssh never trust on net, hacker can disconnet it’s connetion

In terms of speed, DSL is faster than ISDN. DSL sends data packets with speeds ranging from 128Kbps – 1.5Mbps. On the other hand, ISDN comes in two different speeds i.e., 64Kbps and 128Kbps.

In terms of price, ISDN is somewhat more expensive than DSL. The main reason is that DSL utilizes wires that are already installed into homes or businesses, and there is no special line installation needed. However, ISDN lines need to be installed and connection charges vary depending upon the connection you choose.

ISDN is a dial-up service and transmits voice and data through a single line. There are two types of ISDN: Basic Rate Interface (BRI) and Primary Rate Interface (PRI). BRI is used mostly for residential homes and comes with three channels. On the other hand, Primary Rate Interface (PRI) ISDN is a business version and comes with 24 channels. DSL connections are often referred to as "always on" connections, so don't do not need to dial up a number. In DSL, there is only a single route for carrying voice, data and video. Two types of DSL connections are widely: Symmetric DSL (SDSL) and Asymmetric DSL (ADSL). These two types of DSL connections differ in their data carrying capacities i.e., upload and download. For more downloading, ADSL is a better choice.

DIFFERENCE BETWEEN DSL & ISDN