Networking Basics Flashcards
Mb
Mega bits
MB
Mega bytes
Modem
1st connector to internet
turns your ethernet signal / protocol / language used on your internal NW / data transmission into a language that your service company will understand.
T1 connection
uses a device called and AD-Tran
Best overall connection to internet, but very expensive, and not very fast anymore
Not used a whole lot anymore
Has a far reaching connection
DSL
Digital Subscriber Line
provided by phone company
signal is generally very good,
pretty cheap, not super fast
Max speed 12Mb per sec. Limitation of the technology.
Cable modems getting faster, fiber optics getting faster but not DSL
Pro: You have a direct connection to the company so more users does not mean a slower connection.
Asynchronous data transfer = you can always download faster than you can upload.
Cable Modem
Cable Internet Connection.
Develped a lot in last 10 years.
new technology: docis 3.0, when fully implemented it will give you faster speeds
Have to share main bandwitdth so more users sharing connection = slower access
Storage Data is in…
bytes
Speed is in…
bits
Satellite Internet
good for being in middle of nowhere. Upload speed is very slow. Not used much
Router
Allows you to separate different networks.
Used to LOGICALLY divide networks.
Tennants in same building can all be on same internet connection.
One internet connection for multiple tennents ->Modem -> RouterS split out from modem to divide up subnetworks to separate comps and so people can’t hack into each others computers. Can get out to the internet through router but not loop back in to other networks.
Order of devices from internet
Wireless Connection > Switch > Firewall > Router > Modem > INTERNET
Firewall
A security device.
Used to block hackers.
When turned on it blocks everything on NW.
Open port 80 for internet.
VPN
Allows people anywhere in the world to connect to your internal network.
As far as comps and network devices are concerned, that computer is part of your NW.
Their access will be much slower b/c they have to go through the internet to get there.
e.g. they could use your
VPN endpoint
a logical server.
allows the client to connect to this VPN endpoint / server to connect to the internal network
“logical” because it is a service built into another device , it is not a separate device.
What archiatecture does VPN use?
Uses a client-server archiatecture
Hub
obsolete, don’t use one, it is dumb
Switch
Allows everything to connect together in NW.
4 - 48 ports
has a little bit of intelligence.
like a complicated cable splitter.
Smart - distributes data appropriately to devices in the network.
Unmanaged Switch
next level up from hub. cannot configure. everything is automatic.
Managed Switch
can program managed switch settings in the switch
Fastest
Gb networking for switch AND your computer
WAP
Wireless Access Point
allows devices and comps to wirelessly connect to the network.
WAP is connected with a cord to the switch.
80211 A wireless equipment
not really used, can’t use on anything, technically fine but flopped in terms of buisness
80211 B
wireless standard
11 Mb / sec. Old technology, slow, not bad for when it came out
80211 G
Came out 10 years ago
84Mb / sec
Standard now for networks
What is 80211
the number of the standard
List the wireless standards and compatibility
80211 A B G N
g compatible with b
n with g b
a with none
80211 N Networking Device
Best and Newest standard.
Allows for much larger area to be covered by NW.
Much faster, 2x faster than G
Allows for real time video and voice communication.
Build for real time communication.
Pre - N device
might cause weird problems. created to standard but before standard was completed
Cabling
comp connection > cable runs down through building > all come to one area > get connected in to the back of the patch panel > patch cable goes from patch panel into switch
Patch panel
Allows you move networks around.
Makes things neat and tidy.
Can make individual nw connections and move them around depending on when you need the na’s
can run 200 cable connections in building but only have a 48 port switch b/c you won’t need that many but have enough connections distributed throughout building to not worry about moving cables around
Networking device
any device on a NW. Computers to ipods
Server
Any Network Device that provides services
Server vs Windows Server
Window Servers are a type of OS created by Microsoft. Windows server is a type of server but not the only type.
Servers in comp world and Servers in Microsoft Windows world are different critters
Physical
actual cables and devices
Logical
how things actually work and communicate
Modems
a device to connect your local nw to the internet
Patch cord
connects the patch panel to the switch
How Networking devices are packaged
Have all of these devices are built into one device
