Topic 6.2 Flashcards
What is the 802.11 Standard?
It is a set of Standards that defines how wireless LANs should be implemented, what modulation technique must be used and what protocols to follow
What is the Specs of 802.11b?
Speed = 11Mbps
Band = 2.4Ghz
Transmission type = DSSS
What is the Specs of 802.11a?
Speed = 54Mbps
Band = 5Ghz
Transmission type = OFDM
What is the Specs of 802.11g?
Speed = 54Mbps
Band = 2.4Ghz
Transmission type = OFDM
What is the Specs of 802.11n?
Speed = 108-300Mbps
Band = 2.4Ghz and 5Ghz
Transmission type = OFDM
Special Ability = MIMO
What is the Specs of 802.11ac?
Speed = 1Gbps
Band = 2.4Ghz and 5Ghz
Transmission type = OFDM
Special Ability = MU MIMO
What is the Advantages and Disadvantage of a 2.4Ghz Band?
Advantage:
1) Can cover a large area
2) Can penetrate solid Objects
Disadvantages:
1) Slower Speeds
2) More interference due to many devices on this band and less channels
3) Low data rate processing
What is the Advantages and Disadvantage of a 5Ghz Band?
Advantage:
1) Faster Speed
2) Less interference due to less device on this band and more channels
3) High data rate Processing
Disadvantages:
1) Cannot Cover a Large area
2) Bad at penetrating solid object
What are 4 Less Secure way of securing wireless network?
1) Turning Off SSID
2) Mac Filtering
3) WEP
4) Using Weak Passwords
What are other ways of to Secure wireless network?
1) Limit the Number of Device that can connect to your network
2) Make a Complicated Password for your network
3) Avoid meaningful names for SSID
4) Implement intrusion detection by if multiple failed attempt of entering SSID Password can lock the user out .
Why is WEP not good? (4 points)
1) Weak Encryption: R4C protocol has a static key which is easily crackle
2) Limited Key Size: 40Bits
3) Not compatible with new device
4) No Mutual Authentication
What is the best way to Secure wireless network?
1) Use WPA2 with strong password
2) Update router firmware regularly
3) Change default password for router
4) Disable Remote Management
