Defining Network Infrastructure
and Network Security
The Internet is a worldwide system
of connected computer networks.
Computers that connect to the
Internet use the TCP/IP protocol suite.
World Wide Web
The World Wide Web
Local Area Network
A local area network (LAN) is a group
of these computers that are confined
to a small geographic area, usually
LAN requires computers with network
Defining Networks with the OSI
Open Systems Interconnection (OSI)
The Open Systems Interconnection
(OSI) reference model is used to
define how data communication
occurs on computer networks.
This model is divided into layers,
OSI Model Chart
Software on PC access
6 Presentation Encryption
host to host
end to end connection
reliable data delivery
in the Command
The Windows command prompt is
Microsofts version of a command-line
interface or CLI.
Running the command prompt as an
Administrator is also known as running it
in elevated mode.
and Wireless Networks
Wired networks are still the most
common type of physical connection
that computers make.
Twisted-pair cable is the cable most
commonly used in local area networks.