Connecting to a Network
What is needed
Hubs
• Acts as a repeater
• A hub sends data to all the computers on the
network
• Operates on OSI layer 1
• Size is restricted due to collision detection
• Can cost as much as thirty dollars to hundred
dollars depending on the number of ports, which
is limited due collision detection
• Used for simple applications
This is what a hub looks like
“Hub”. Photo. Rizblogs.com (2014, June 9) retrieved on July 10, 2014 from
http://www.rizblogs.com/?p=192
This is how a hub connects physically
“Hub2”Photo. Directsystems.com Retrieved on July 10, 2014 from
http://www.directsystems.com/support/diff_hubanim.gif
The switch
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Looks like a hub
Works in OSI layer 2
Has a MAC address
Comes with software that improves the traffic
flow compared to the hub
• Can cost from hundreds of dollars to thousands
depending on the need of the customer
• Used for larger network
This is what a switch looks like
“Switch”. Picture. Rizblogs.com (2014, June 9) retrieved on July 10, 2014 from
http://www.rizblogs.com/?p=192
This is how a switch connects to a
network physically
“Switch2”.Picture. Directsystems.com retrieved on July 10, 2014 from
http://www.directsystems.com/support/switchvshub.php
The router
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Is more powerful than a hub, switch or bridge
This device works in OSI layer 3
Contains firewalls to protect users
Comes with management tools that will
provide extra features.
• Costs from about fifty dollars to a couple
hundred dollars
• Used in home applications and businesses
What a router looks like
“Router” Picture. D-Link .retrieved on July 10, 2014 from
http://www.dlink.com/us/en/business-solutions/security/services-routers/dsr-500nwireless-n-unified-services-router
This is how a router connects to a
network physically
“Router2” Picture. Weatherdirect.com. Retrieved on July 10, 2014 from https://www.weatherdirect.com/router/
The Bridge
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Works just like a switch
Uses MAC addresses
Works in OSI Layer 2
Costs anywhere from 50 dollars to a couple of
hundred dollars
• Used to connect networks
This is what a bridge device looks like
“Bridge” Picture. Tigerdirect.com. retrieved on July 10, 2014 from
http://www.tigerdirect.com/include/AddCartfromGallery.asp?EdpNo=281683&csid=
ITD&Sku=A191-0024&imgcart=1
This is how a bridge connects to a
network physically
“Bridge2”. Picture. Certiology.com. Retrieved on July 10, 2014 from
http://www.certiology.com/computing/computer-networking/network-devices.html
The Gateway
• Device communicates with your ISP
• Some modems can be Gateways
• Repackages information so two systems can
communicate.
• Acts as a translator for systems that do not us
the same communication protocols
• Cost start from 50 dollars to thousands of
dollars
What a Gateway looks like
“Gateway”. Picture. Us.hardware.info . Retrieved on July 10, 2014 from
http://us.hardware.info/productinfo/372/linksys-wireless-g-adslgateway#tab:photos
This is how a Gateway connects to a
network physically
“Gateway2”. Picture. Oemwatch.com . Retrieved on July 10, 2014 from
http://www.oem-watch.com/VoIP_Gateway_V1101.html
The Firewall
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Protects from unauthorized access
Most NOS’s and OS’s come with software
Protects your network
Very important
Cost can be minimal to significant
Depends how much security is needed
This is what a firewall looks like
“Firewall”. Picture. IET. [2013, August 12]. Retrieved on July 10, 2014 from
http://eandt.theiet.org/magazine/2013/08/cyber-securitys-new-hard-line.cfm
This is how a Firewall connects to a
network physically
“Firewall2”. Picture. Bizguardian.com. Retrieved on July 10, 2014 from http://www.bizguardian.com/firewall.php
The Wireless AP
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Operates with use of IEEE 802.11 standards
Used for wireless connectivity for networks
Also know as WiFi and Bluetooth
Used for mobile devices
Distance is limited
Cost from 50 dollars to hundreds of dollars per
device
This is what a Wireless AP looks like
“Wap”. Picture. Wireless Access Points. Wikipedia.org retrieved on July 10, 2014
from
http://en.wikipedia.org/wiki/Wireless_access_point#mediaviewer/File:Linksys_WAP
54G.JPG
This is how a Wireless AP connects to a
network physically
“Wap2”. Picture. Vicomsoft.com retrieved on July 10, 2014 from
http://www.vicomsoft.com/learning-center/wireless-networking/
Diagram of a Network
“Network” .Picture. Reddit.com. Retrieved on July 10, 2014 from
https://www.google.com/imgres?imgurl=http%3A%2F%2Fi.imgur.com%2FHI8M0BY.
png&imgrefurl=http%3A%2F%2Fwww.reddit.com%2Fr%2Ftechnology%2Fcomments
%2F1wq4ak%2Fbitcloud_wants_to_replace_the_internet%2F&docid=65ZCjrohK745
hM&tbnid=8cyDmvBw_Ml_7M%3A&w=600&h=424&ei=ik_AU8CQIYGmyATKy4GYCg
&ved=0CAIQxiAwAA&iact=c
Reference
• Black, U. D., & Habraken, J. W. (2009). Sams
teach yourself networking in 24 hours (4th
ed.). Indianapolis, Ind.: Sams.