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The University of Akron Summit College Business Technology Dept. 2440: 141 Web Site Administration Remote Web Server Access Tools Instructor : Enoch E. Damson. Web Environment Servers. Some servers you can access remotely include: File Transfer Protocol (FTP) servers

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the university of akron summit college business technology dept

The University of AkronSummit CollegeBusiness Technology Dept.

2440: 141Web Site Administration

Remote Web Server Access Tools

Instructor: Enoch E. Damson

web environment servers
Web Environment Servers
  • Some servers you can access remotely include:
    • File Transfer Protocol (FTP) servers
    • Network News Transfer Protocol (NNTP) servers
    • Telnet
    • Streaming Media Servers

Remote Connection to Web Servers

running an ftp server
Running An FTP Server
  • File Transfer Protocol (FTP)
    • Used to shares files between networked computers
    • Client and server programs available for all platforms
  • FTP has been integrated into modern Web browsers
  • Anonymous FTP
    • Current primary use of FTP
    • Allows access to FTP server without account
  • FTP servers may be set up to restrict file access
    • Users authorized to access files are "known"

Remote Connection to Web Servers

ftp client server interactions
FTP Client/Server Interactions
  • FTP utilizes two ports:
    • Control port (port 21) – serves as a communication channel between the client and the server for commands/replies exchange
    • Data port (port 20) – used purely for the data exchange
  • FTP can operate in two modes:
    • Active FTP – the FTP client does not make actual data connection to the server
      • The client informs the server of its own port with a port command
    • Passive FTP – the FTP client issues a pasv command to indicate that it wants to access data in passive mode

Remote Connection to Web Servers

using an ftp client
Using an FTP Client
  • Required for accessing an FTP server
  • FTP clients may be text-based or graphical
  • Accessing an anonymous FTP server with ftp
    • Specify the server name after the ftp command
      • Example: ftp ftp.ibiblio.org
    • A username and password may be needed
      • Enter anonymous as username
      • Enter e-mail address as a password
    • Following logon, ftp> prompt appears
      • Enter commands to interact with the FTP server
      • Enter bye to exit

Remote Connection to Web Servers

using an ftp client1
Using an FTP Client…
  • Using a Web browser to access FTP sites
    • Point browser to ftp server
      • Example: ftp://ftp.hq.nasa.gov
    • Browser logs on to FTP server
      • Uses anonymous as username
      • Uses e-mail address as password
    • Browser creates HTML pages and file listings on the fly
    • Manipulate displayed files using mouse
  • Logging on to an FTP server with a user account
    • Provides greater access to features of FTP service
    • FTP administrator may still restrict activities

Remote Connection to Web Servers

using an ftp client2
Using an FTP Client…
  • There are several FTP clients available
  • One of the clients installed on the Fedora core is:
    • gFTP: FTP specific graphical client

Remote Connection to Web Servers

ftp servers
FTP Servers
  • Some FTP servers include:
      • vsftpd (very secured ftp daemon)
    • wu-ftp: Washington University FTP server

Remote Connection to Web Servers

ftp servers1
FTP Servers…
  • Three types of FTP users
    • Anonymous: use ftp or anonymous as logon name
    • Real: use a regular Linux user account
    • Guest: use restricted regular user accounts

Remote Connection to Web Servers

setting up ftp configuration files
Setting Up FTP Configuration Files…
  • Define user classes to assign permissions by group
  • Example of class including all three FTP user types
    • class office real, guest, anonymous 192.168.100.0/24
      • All users logging on from given address are in office
  • Define message files for screen display
    • Contents automatically displayed by FTP server
  • Controlling file actions permitted to FTP user
    • Use series of directives naming file action
    • Follow directive with yes or no
    • Include class of user to which directive applies

Remote Connection to Web Servers

understanding news servers
Understanding News Servers
  • News servers allow threaded discussions
  • You post messages in a newsgroup
  • A newsgroup focuses on a single topic
  • There are several public newsgroups available
  • There are hundreds of gigabytes of information generated per day
  • News servers can be set up for use within an organization
telnet and windows
Telnet and Windows
  • Telnet is not popular in Windows because telnet is text-based and Windows relies on a GUI
    • However, there are many command-line utilities that can be used
  • Before Windows, Microsoft networking depended on a single command net with many options
  • cacls can be used to alter permissions
  • netsh starts a networking shell which allows you to configure and display many network-related items
understanding streaming media services
Understanding Streaming Media Services
  • Used to transfer video and audio
  • By default, UDP is used
    • Although TCP and HTTP can be used because of firewall issues in an organization
  • No single standard exists
  • Broadcast methods
    • unicast – each packet is sent individually to each client
    • multicast – each packet is sent to many clients
understanding e commerce servers
Understanding E-Commerce Servers
  • Can be as simple as a product list and a shopping cart
  • Can be as complex as amazon.com
  • Microsoft Commerce Server is an add-on to IIS
    • Incorporates a number of features required for a typical e-commerce site
    • Highly customizable