Transcript CIS110 Unit1Cx

Unit 1
Section C
Computer Networks
COMPUTER NETWORK
Connects two or more computers in order to
share:
Data which may be located on another computer
Use the Internet to look up the definition of computer
network on Wikipedia
Displays data located on the Wikipedia server
Devices not connected directly to that computer
Use the HCC local area network (LAN) to print documents
from your computer to the printer located in the lab
Allows many computers to share this device
Definition varies a bit depending on the source
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
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LOCAL AREA NETWORK (LAN)
Computer network in a limited geographic area
This definition also varies somewhat
Most would call the HCC network of computers a
local area network (LAN)
HCC stretches the definition of local by connecting
the High Tech Center several miles away
For simplicity, we’ll refer to HCC’s network as a LAN
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
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LOCAL AREA NETWORK CONNECTIVITY
One common type of LAN uses Ethernet
technology for wired connectivity
Client must have a network interface card (NIC)
NIC provides RJ45 port to connect to the network
RJ45 connector looks like a phone connector but is wider,
providing 4 wires instead of 2
The other common type of LAN uses WiFi
technology for wireless connectivity
WiFi uses radio waves to send network signals
Client must have a wireless card
Most laptops now include wireless capability
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
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WIDE AREA NETWORK (WAN)
Computer network covering a broad geographic
area, such as between cities
The Internet is a WAN
It spans the entire world
Shortened from the term internetwork meaning a
network of smaller networks
Uses a completely different set of hardware and
rules for communication than a LAN
A WAN is typically a network of LANs
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
Slide 5
PERSONAL AREA NETWORK (PAN)
Brought about by broadband internet access
Use a router to allow multiple computers to
share the same broadband internet connection
Typically found in homes
Also used in public internet access points such as a
coffeehouse or internet café
Improves security by providing firewall from internet
Can be wired but is usually wireless (WiFi)
Can be secured or unsecured
Avoid sensitive data on an unsecured, wireless PAN
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
Slide 6
CLIENTS AND SERVERS
A file server is a computer that provides (or
serves) data to other computers on a network
A client is a computer that requests and
receives data from a server
The client-server relationship is very common in
today’s networks
Virtually any computer can be a client or server
The computer’s role as client or server determined
by software configuration, not hardware
Chapter 1, Slide
Introduction
to Computers
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Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
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NETWORK STORAGE
Computers in the HCC labs are all clients
Can request and receive data from servers on
the network
Each student has their own storage space
allocated to them on the network
Your best & most reliable storage option on campus
Listed as your M: drive in Windows Explorer
M: drive available from any computer on campus
Not available via the internet from off-campus
Chapter 1, Slide
Introduction
to Computers
8
Unit 1C – Computer
Starting Out
Networks
with Visual Basic 3rd Edition
Slide 8