Chapter 6 2a Distinguish between 802.3 standards and 802.11 standards. 2b Distin

Question

Chapter 6

2a Distinguish between 802.3 standards and 802.11 standards.

2b Distinguish between 802.11 and Wi-Fi.

3a Why do wireless clients need access to the firm’s main wired switched Ethernet network?

4a In 802.3 Ethernet networks, can simple installation rules usually reduce propagation effects to nonissues?

4b In 802.11 Wi-Fi networks, can simple installation rules usually reduce propagation effects to nonissues?

9a Does a signal usually travel at a single frequency, or does it spread over a range of frequencies?

9b If the lowest frequency in a channel is 1.22 MHz and the highest frequency is 1.25 MHz, what is the channel bandwidth?

11a In Wi-Fi service bands, what type of transmission method is required by regulators?

11b What is the benefit of spread spectrum transmission for business communication?

11c Is spread spectrum transmission done for security reasons in commercial WLANs?

22a Why is wider channel bandwidth good?

22b What is the downside of wider channel bandwidth?

22c What frequency band or bands do 802.11g, 802.11a, 802.11n, and 802.11ac use?

Chapter 7

1a What was the attacker’s first step in breaking into TJX and other companies?

1b Why do you think TJX failed to upgrade to stronger security than WEP?

1c How was the TJX break- in an international crime?

4a For what use scenario was 802.11i PSK mode created?

4b How does a user authenticate his or her device to the access point?

5a Why is WPS desirable?

5b Why should you not use it?

6a If a firm has many access points, which 802.11i mode must it use?

6b What mode or modes of 802.11i operation use a central authentication server?

7a In Ethernet, why does 802.1X not need security between the authenticator and the host before 802.1X authentication is done?

7b Why does 802.1X mode in 802.11i need security between the authenticator and the host before 802.1X authentication?

7c What is the most common protocol for providing this initial security?

Explanation / Answer

3. a Why do wireless clients need access to the firm’s main wired switched Ethernet network

Wireless clients to access network resources it needs to be connect to wireless access point, which is usually connected to Ethernet LAN where resources such as Internet access router are usually located.
802.11 WLANs today are also primarily supplement wired LANs.

9b If the lowest frequency in a channel is 1.22 MHz and the highest frequency is 1.25 MHz, what is the channel bandwidth?
1.25 - 1.22 = 0.03 MHz or 30 kHz

9a Does a signal usually travel at a single frequency, or does it spread over a range of frequencies?
Singlas spread over a range of frequencies, this range is known as the Bandwidth

22a Why is wider channel bandwidth good
Because they are much faster than narrowband

11a In Wi-Fi service bands, what type of transmission method is required by regulators?
Spread Spectrum Transmission

11b What is the benefit of spread spectrum transmission for business communication?
uses far wider channels than required

11c Is spread spectrum transmission done for security reasons in commercial WLANs?
no

22c What frequency band or bands do 802.11g, 802.11a, 802.11n, and 802.11ac use?

20MHz

6b What mode or modes of 802.11i operation use a central authentication server?
A) 802.1X mode

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