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Local Area Network (LAN)
smallest network
operated within a limited physical area
a network consisting of less than 500 interconnected devices
Metropolitan Area Network (MAN)
high speed network that connects local networks in a metropolitan area
handles bulk of communication activity
Wide Area Network (WAN)
covers a large geographical area
connects multiple Local Area Networks (LAN)
combines many types of media such as telephone lines, cable, and radio waves
internet - largest wide area network
Client Server Network
where different computers or clients are connected to a main computer or server
Peer-to-Peer Network
different computers with equal capacities connected to use resources available on the network
designed primarily for small local area networks
Bus Topology
each node shares the network’s total capacities
adding more computers will reduce network speed
Ring Topology
each node is connected to form a circle
data travels only in one direction
if a node fails, the whole network fails
Star Topology
each node is connected through a central device
centralized control
Mesh Topology
nodes are interconnected with one another
facilitates direct communication
if a node fails, there are alternatives in the network
First Generation
reliant upon analog radio systems
could only make phone calls
introduced in 1979 in Japan
unreliable due to security issues
Second Generation
ran on digital signals
could send SMS and MMS (but often without success)
uses GPRS technology
introduced in 1991
improved capacity and security
Third Generation
can video call, share files, surf internet, etc.
much faster and greater data transmission
Fourth Generation
five times faster than 3G
can provide up to 100Mbps
all mobile models released 2013 should support
higher specs
Short Message Service (SMS)
A text message of up to 160 characters without an attached file
Multimedia Messaging Service (MMS)
Text that includes a file—like a picture, video, emoji, or a website link
General Packet Radio Service (GPRS)
a packet-switching technology that allows information to be transmitted via mobile networks.
used in 2G and 3G
introduced in 1997
File Management
Methods for naming, storing, and handling files
Drive Letters
A single alphabetic letter A through Z is assigned to a physical computer drive
Folders
A container for files
Subfolders
A folder contained within another folder
Directory
Organization of files and folders on a disk
Root directory
Highest level of any directory on a disk always represented by a drive letter
Path
Indicated the exact route to follow to get the location of a file
Ctrl + C
Copy a file
Ctrl + F
Search for files
Ctrl + X
Cut/move file
Ctrl + V
Paste
Ctrl + S
Save
Ctrl + Shift + S
Save as
Ctrl + W
Close a window
F2
Rename a file
Ctrl + Shift + T
Reopen a closed tab
Ctrl + Shift + N
Create new folder