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Cut the Wires?
Cut the Wires?
How often do you see someone sitting in an airport lounge or coffee shop working on a laptop computer? Sure they could be playing solitaire, but the odds are increasing that they are corresponding via e-mail, sending a report back to...
Life in Cyberspace
Two disparaging claims often made about the online world are that it is inhibited with nerds who don't have a life and that 30 years old woman you met and liked is actually a 13 year old boy. Both have a basis in fact. Some pioneering message-board...
Protection for your PC - Painless and Free !
Painless (and FREE) P.C. Protection Viruses, Bugs, Worms, Dataminers, Spybots, and Trojan horses. The Internet is a veritable minefield of things that can invade your PC and affect it's Security and Performance. You can do something about it and...
The Google Feedback Loop For Quality Traffic
**For this to work, you need some kind of tracking for your website/web pages that tells you which search engines send people to you for what keyword searches.
Now truly, for a website owner there is nothing more fascinating than their own stats,...
What SMS Users Are Telling Telcos
The recent rollout of 3G-ready mobile devices has caused a lot of excitement in the Telco industry, especially in the Asia-Pacific region. This article will highlight the message that current customers are sending through their SMS messaging...
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Internetworking Overview
Internetworking:
Internetworking involves connecting two or more computer
network with some sort of routing device to exchange traffic
back and froth, and to guide traffic on the correct path across
the complete network to their destination . Connecting together
two or more networks with bridges sometimes inaccurately refer
to as internetworking ,but the resulting system is a single
subnetwork ,and users require no internetworking protocol, such
as IP,to traverse it. Briefly, I will present :Network Layers,
Tunneling technique .-which are misunderstood terms in computer
network-
Network layers:
1.physical layer (Repeaters & Hubs): They just move the bit from
one network to an identical network. these are mostly analog
devices and do not understand any thing about digital
protocols(regenerate singles)
2.Data link layer (Bridges & switches): They accept frames
,examine MAC addresses and forward the frames to different
networks ,doing minor protocol translation.
3.Network Layer (Routers): They can connect two networks and do
packet translation ,but translation is increasingly rare.
4.Transport Layer(Transport Gateways): They can interface
between two transport connection
.For example ,allow packets to
flow between a TCP network and SAN network.
5.Application Layer (Application Gateways): They translate
message semantics for the data being moved, such as parsing and
changing header fields between an Internet e-mail and X.400
e-mail.
How Network Differ?
Networks can differ in many ways: 1.They may differ in their
Physical layer :by having different modulation technologies.
2.they may differ in their data link layer by: having different
frame format. 3.they may differ in their network layer by:
having different internetworking protocols.
Networks can be connected by different devices according to the
level of connection.
Tunneling: Tunneling is a technique used for passing information
between two networks of the same type of network, but there is a
different network in between. When the router gets the frame, it
pulls the IP packet out of the frame and drops it into the
payload field of anther frame to send across the WAN. this is
undone at the other end ,allowing the data to be received on the
other end.-More about Tunneling later-
To Be Cont .. T. M . Harahsheh
About the author:
Jordan
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