Chapter 14 Wireless Networks Flashcards
What is a Basic Service Set (BSS)
A single WAP servicing a given area
What is a Extended Basic Servicing set (EBSS)
A bunch of WAP providing service to an area
What is a SSID Service set identifier
A name to describe the BSS
How does DSSS (Direct-sequence spread spectrum) work
Sends data out on different frequencies at the same time
How does FHSS (Frequency-hopping spread-spectrum) work
Sends data over a frequency one at a time constantly switching or hopping at a time
How does OFDM (Orthogonal frequency-division multiplexing) work
What channels are allowed for the 2.4ghz band
1 through 11
Why should two WAP close to each other use channels that are far away from each other
To reduce the chance of interference
What are the most common 2.4ghz channels
1 6 and 11
What is Carrier-sense multiple access with Collision avoidance
A wireless client wont send any packets until it knows no other client is sending anything
What is the speed and ghz of 802.11b
11 Mbps at 2.4ghz DSSS
What are the speed and frequency of 802.11a
54Mbps at 5Ghz OFDM
What is the speed and frequency of 802.11g
54mbps at 2.4Ghz OFDM
What is the speed and frequency of 802.11n
108-300 Mbps at 2.4Ghz/5.0Ghz MIMO OFDM
What is the speed and frequency of 802.11ac
1Gbps+ at 5.0Ghz MU-MIMO
What is the shape of an omni antenna radiation pattern
A spherical shape
What is the radiation pattern of a dipole antenna
A flat donut shaped pattern
What is the radiation pattern of a patch antenna
Half a circle (radiates in one direction)
What is the radiation pattern of a Directional/Yagi
A stretched football like pattern
What is the radiation pattern of a Parabolic antenna
Same as a Yagi/Directional like football pattern but can go out to about 8 miles
What encryption protocol does WPA2 use
CCMP-AES
What is the encryption protocol of WPA
(TKIP) Temporal Key Integrity Protocol
What are three things you can do to harden security of a wireless network
- Disable SSID broadcast
- Use NAC filtering
- Limit the number of DHCP issued addresses
What is a Rouge (AP) Access Point
Any unauthorized access point on a network
