By: Amy Simon
What happened to my student’s
project?
 Why can’t I access my lesson in the
computer lab?
 I know I saved it… somewhere…
 WHERE DID IT GO?????
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Parts of the network
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◦
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Internet
Modem
Router
Firewall
Switch
Wireless Access Point
Devices, Servers, and Clients
WAN/LAN
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The internet cloud is a set of routers and other
highly sophisticated communication devices
managed by Internet Service Providers (ISPs).
Refers to anything associated with the internet.
◦ Email server
 Gmail
 Yahoo
 Outlook
◦ Websites
 Reading A-Z
 Envision
 Everyday Math
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Sometimes referred to as “the cloud”
◦ Highly technical, high speed, very sophisticated
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The modem connects devices to the internet.
Translator between your network and the internet
cloud.
Several types of modems:
◦ T1 – best internet connection, but not very fast and very expensive;
great option where DSL or Cable modems aren’t available.
◦ DSL (Digital Subscriber Line) – provides solid connection through
telephone company, no shared bandwidth so connection doesn’t slow
down with high volume.
◦ Cable – few problems using cable, but main bandwidth is shared, so
when there is high usage volume the service will be slow.
◦ Satellite – great option for remote areas, but very slow as it connects
with satellites in space. Uploading is nearly impossible with this type
of connection.
◦ 4G – connects wireless devices to cell phone towers.
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A protective layer
Tries to protect from hackers.
Different types of firewalls:
◦ Software firewalls on a server or device
◦ Security device built into modem or router
 Settings on this firewall will affect internet services for
the entire network!
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Allows devices to get to the modem and
internet
Allows you to separate networks so there can
be different networks within the same
building.
It is common for routers now to have the
modem, router, and firewall all built into one
piece of hardware.
◦ Some routers even have a switch and wireless
access point built in for small networks, too.
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Connects all devices on the network together
Has ports for each computer, which connects
each computer to the router.
Switches in large networks can get very
complex, much more so than the one
pictured below, to allow for many computers
to be connected to the network.
ports
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One cable from each wireless access point is
connected to the switch.
Allows wireless devices (printers, laptops,
phones, iPads, etc.) to connect to the network
and internet.
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Device: anything connected to the network
Server: a networked device that provides a
service to other devices on the network.
◦ File server: One central computer that stores all of
the files that everyone can access over the network.
◦ Print server: Allows computers to print through it.
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Client: a device in the network that accesses a
service from the server.
printer
server
computer
Devices/Clients
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LAN: Local Area Network
◦ A network within a building or small area
 Each school building can have its own LAN
 A district can have its own LAN
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WAN: Wide Area Network
◦ A network that covers more than one LAN to share
applications or data.
 A network between school districts
 The internet is the largest WAN
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modem
firewall
router
switch
swit
ch
Typically all one piece
of hardware.
file server
print server
printer
computers
wireless
access
point
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NETC: A Guide to Networking for K-12. (n.d.).

Retrieved September 15, 2013, from
http://www.netc.org/network_guide/
Networking - FREE Computer Training. (n.d.).
Northwest Educational Technology Consortium.
FREE Computer Training - Computer Repair
Classes - Laptop Repair Instruction - Data
Recovery Lessons - Web Design Seminars Computer Security Counseling. Retrieved
September 15, 2013, from
http://www.elithecomputerguy.com/classes/net
working/
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Pictures from:
http://it.ballaratsc.vic.edu.au/IT2/Theory%20topic%20notes/Theory
TopicG-Computer%20network%20designs.htm