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Introduction to Wifi and Wireless Access Points
Tuesday, February 16, 2016

8:52 AM

• Wifi is short ranged radio waves to act as a substitute to cable internet
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11
• Most devices use a wireless NIC now
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Two Types of setups for WAP:
• Infrastructure Mode: Has a wireless access Point
• Ad Hoc Mode: A network connected without ethernet or a wireless access point
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SSID (Service Set
Identifier)

A phrase that declares what type of connection a wireless access point has;
The name of the network being broadcasted out
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A single WAP and a single SSID
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For example, you can have multiple wireless access points all connected to the same switch, and with all
the same SSID, and when you connect to one, you're connected to the same network
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This is known
as Extended Basic Service Set Identifier
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11 Standards
Tuesday, February 16, 2016

9:40 AM

802
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• The 2
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MIMO (Multiple In / Multiple Out) Allowed to use multiple channels to talk to multiple devices
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11:
• 802
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4 GHz band
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• 802
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11G: 2
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Interferes with bluetooth, microwaves, cordless phones
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140 meters in distance
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11N: Runs with both 2
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Using both 2
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Uses MIMO
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11AC: Took everything bad about N and fixed it, 3 Atenas for N, 2 Atenas for AC, I GBPS
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11I:

802
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CSMA/CA (Wireless) Carrier Sense Multiple Access Collision Avoidances
CSMA/CD (Wired)

Carrier Sense Multiple Access Collision Detection

LWAPP Lightweight Access Point Protocol
• Used to control thin-client wireless access points

Wireless Networking Page 2

Power over Ethernet (PoE)
Tuesday, February 16, 2016

10:09 AM

PoE is using power through ethernet cable
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• To use PoE, both the wireless access point and switch have to be capatible with PoE
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If the switch doesn’t have enough energy, you can use whats called a PoE injector
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A man-in-the-middle device
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• PoE+ uses more power than PoE

Wireless Networking Page 3

Wireless Security Standards
Wednesday, February 17, 2016

8:10 AM

NETWORK+ WANTS YOU TO KNOW HISTORY OF ENCRYPTION VERY WELL
WEP

Wired Equivalent Privacy

• WEP can use two keys, 40 / 64 Bit, or 104 / 128 Bit
• WEP is extremely crackable
WPA

Wifi Protected Network

• Uses TKIP
WPA2 Uses AES
AES

Advanced Encryption Standard

Wireless Networking Page 4

Implementing Wireless Security
Thursday, February 18, 2016

9:59 AM

• Best encryptions is WPA2
Broadcast SSID

Your router broadcasting the network for the public
to see
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Safety Protocols:
• Disable SSID Broadcast
• Use MAC filtering
• Limit the number of DHCP-issued addresses
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WarChalking An old fashion way to map out open networks
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Reasons people get into networks:
• Stealing bandwidth
• Using it for Hacks
WIDS

Wireless Intrusion Detection System

WIDS can detect when a new WAP enters your network and authorizes them
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Evil Twin

A replica phishing access point
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War Chalking Drawing a symbol on the sidewalk to indicate the state of the WAP
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• TURN OFF WPS

Wireless Networking Page 8

Wireless Problems Scenarios
Friday, February 19, 2016

9:55 AM

Electromagnetic Interference
(EMI)

Radio interference caused by multiple radio frequencies colliding
(Same channels)
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But this standardized speed can vary due to radio interference
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Types of radio shapes:
• Omnisignals – Going in every direction, looks like a radio ball
• Dipole antenna – generates a flat circle radio wave
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A one direction type of signal
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• Long WAP cables that connect to antennas kill gain the longer they are
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Wireless Networking Page 10



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