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Cisco Certification: Becoming A Truly Valuable CCNA
I've been active in the Cisco Certification track for four years, working my way from the CCNA to the coveted Cisco Certified Internetwork Expert title, and during that time I've conducted job interviews and casual conversations with...
RF Engineering for 802.11 WLAN
The article describes electromagnetic propagation and how RF engineering concepts can be applied specifically to 802.11 Wi-Fi WLANs. The popular formulae often applied to wireless networking are explained in clear, concise terms, with the math and...
Visual Sciences- An analysis Software
Visual Sciences is the leading provider of real-time visual
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The Visual Sciences team delivers its expertise from backgrounds
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VoIP A Global Telecommunications Revolution
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Web Cams: Sci-Fi communication at Home
Computers and web cams are taking communication to levels only imagined in sci-fi novels.
One of the most incredible inventions I’ve ever come across is the web cam and its process of video conferencing. This is just so futuristic I can’t...
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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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