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Networking I


Addresses consist of a username followed by an at sign _at_ followed by a domain for mail. ... in other software e.g. Outlook Express is part of Windows; AOL has e-mail ... – PowerPoint PPT presentation

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Title: Networking I

Networking I
  • Chapter II
  • The Internet

How does one Connect?
  • Dial-Up Connection Modem
  • ISDN Integrated Services Digital Network
  • DSL Digital Subscriber Line
  • Cable Modem
  • Satellite
  • Radio Waves
  • T1
  • T3

Telephone Modem
  • Speed up to
  • 56K bits/second (download)
  • 32K bits/second (upload)
  • Available everywhere
  • Service Cost up to 25 monthly
  • Modem cost free to 50 or so

  • Integrated Services Digital network
  • Over Ordinary phone line but not always available
  • Can share a phone line with voice
  • Speeds up to 128k bps.
  • Service Cost up to 100 per month or so.
  • No longer as popular as it was about 4 years ago.

  • Digital Subscriber Line
  • Service cost from 30 to 50 pre month
  • Not available in many places
  • Shares a line with voice.
  • Speed up to 7 or 8 megabits/second

Cable Modem
  • (What I have at home)
  • Service about 40 per month
  • Always on
  • Requires a NIC for your computer and an RJ-45
    cable between modem and NIC.
  • Modem costs about 150 to 200 (but is free with
    most packages.
  • NIC costs from 10 to 150 or more.
  • Speed depends on the number of users but ranges
    from standard modem speed up to about 10

  • Primarily for downloads.
  • Typically use phone lines for uploads
  • Speed is slow 400k bits/second download 56k
    bits/second upload
  • Expensive up to about 125 per month.
  • Wireless and available everywhere, much like
    satellite TV.

Radio Waves
  • Available on some more advanced cell phone plans.
  • Cost typically 40 per month plus cost of phone
  • Extremely fast (in the 100mb per second range)

T1 and T3
  • Expensive T1 in the 500 to 2000 per month
    depending on the distance from the station T3 in
    the 10,000 per month range.
  • Fast T1 is 1.5 megabits/second and T3 is 45
  • The campus network at the UofS is hooked to the
    internet by a partial T3 line, which we share
    with others. Our bandwidth is 25 mbps.

ISPs Intenet Service Providers
  • Free Typically heavily sponsored. Most of the
    free services are no longer available because of
    technology which kills ad windows.
  • Basic Few Features dialup number, software
    (which is free with windows anyway), limited tech
    support, simple e-mail and perhaps USENet -- 10
    to 16 monthly
  • Full ISPs such as AOL, MSN, Compuserve, 24/7
    tech support, multiple e-mail accounts, web pages
    -- 20 to 20 per month.

Choosing an ISP
  • In your case if you are a resident student then
    you have an account through the U for free with
    purchase of a NIC
  • Find whats locally avaliable and what it costs.
  • You can normally get a free trial for a month
    from most major providers.

IP Addressing
  • All machines on the Internet have an IP address
    (internet protocol address)
  • This address is 4 numbers from 0 through 255, so
    for example the machine in my office is
  • Some addresses are static and some are dynamic.

Dynamic vs. Static Addressing
  • Dynamic addressing gives you a possibly different
    address each time you connect to the Internet.
  • Static addressing gives you the same address all
    the time.
  • My office machine is static.
  • My laptop is dynamic because it has different IP
    addresses in my office and in the classroom.
  • In my office it can also have different addresses
    on different days.

Domain Name Addressing
  • IP addresses are hard to remember.
  • Domain name addressing uses several words
    separated by dots.
  • My office machine has a domain address of
  • Domain addresses are normally used for e-mail and
    web pages although you can use IP addresses if
    you want to.

  • You already understand this.
  • Addresses consist of a username followed by an at
    sign _at_ followed by a domain for mail.
  • I have several local e-mail addresses
  • Typically e-mail user names ARE case sensitive
    but domain names are NOT.

E-mail software
  • Included in other software e.g. Outlook Express
    is part of Windows AOL has e-mail built in
    Outlook is part of MS Office
  • Web based e-mail. You dont have software for
    reading e-mail. It is read through a browser and
    e-mail accounts are free from a variety of
  • Separate e-mail programs e.g. Eudora.

E-mail attachments
  • MIME
  • Multipurpose Internet Mail Extensions
  • Types of attachments to mail messages typically
    denoted by file name EXTENSION.
  • A source of viruses but can also be used to send
    files containing, voice, pictures, animation, etc.

Instant Messaging
  • The ability to talk via keyboard with other
    individuals in real time.
  • AOL/Netscape IM is currently the most popular but
    the service is offered by MSN, ICQ, Yahoo and
  • Powerful features such as private chat room for
    several people and file sharing are available in
    many of these programs.

Mailing Lists
  • E-mail that is sent to a list-serv for
    distribution to a list of people
  • Open mailing lists can be subscribed to by many,
    while closed lists can only be subscribed to by
    invited guests.
  • Moderated lists have all their messages examined
    by the moderator for appropriate content.
  • Lists can either be a digest or separate message

The World Wide Web
  • Typically the content is multimedia containing
    text, graphics, sound, and animation.
  • Hyperlinks enable convenient navigation.
  • HyperText Markup Language (HTML) is used to write
    web pages.
  • Some pages contain special code to implement
    features. This code is typically written in a
    programming language called JavaScript.