| Date of Issue: 03-01-2023 | Rate this Study Guide |
Question 1.
What is the two-step authentication method specified by the IEEE 802.11 standard?
| a) | Shared Key |
| b) | Open Key |
| c) | Shared System |
| d) | Open System |
| e) | Partial keyed response |
Question 2.
What is the formula for determining SNR?
| a) | SNR = signal level (dBm) - noise level (dBm) |
| b) | SNR = signal level (dBd) - noise level (dBd) |
| c) | SNR = signal level (dBi) - noise level (dBi) |
| d) | SNR = signal level (dBm)/noise level (dBm) |
| e) | SNR = signal level (dBd)/noise level (dBd) |
Question 3.
Why are 64-bit and 128-bit WEP keys often referred to as 40-bit and 104-bit keys?
| a) | The alphanumeric character string is truncated during transmission. |
| b) | The alphanumeric character string is combined with a random VI. |
| c) | The alphanumeric character string is truncated before transmission. |
| d) | The alphanumeric character string is combined with a random IV. |
| e) | Only the first 40 and 104 bits of the alphanumeric character string are actually used. |
Answers
Question 1.
What is the two-step authentication method specified by the IEEE 802.11 standard?
| a) | Shared Key |
| b) | Open Key |
| c) | Shared System |
| d) | Open System |
| e) | Partial keyed response |
| d) | Open System |
Explanation
Open System Authentication is the default authentication technique for all access points. It is a two-way process in which the client sends an authentication request to the AP, and the AP replies with an authentication message. This is not much of an authentication system, since it basically allows any requesting station to join the BSS cell. There are several ways to enhance the level of security on your access point, even under the Open System configuration. You should never leave the default wide-open configuration in place for a production network.
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Question 2.
What is the formula for determining SNR?
| a) | SNR = signal level (dBm) - noise level (dBm) |
| b) | SNR = signal level (dBd) - noise level (dBd) |
| c) | SNR = signal level (dBi) - noise level (dBi) |
| d) | SNR = signal level (dBm)/noise level (dBm) |
| e) | SNR = signal level (dBd)/noise level (dBd) |
| a) | SNR = signal level (dBm) - noise level (dBm) |
Explanation
Signal-to-noise ratio (SNR) is how much the signal level exceeds the general background RF noise level of the environment. The formula to calculate this is:
SNR = signal level (dBm) - noise level (dBm)
[5134]
Question 3.
Why are 64-bit and 128-bit WEP keys often referred to as 40-bit and 104-bit keys?
| a) | The alphanumeric character string is truncated during transmission. |
| b) | The alphanumeric character string is combined with a random VI. |
| c) | The alphanumeric character string is truncated before transmission. |
| d) | The alphanumeric character string is combined with a random IV. |
| e) | Only the first 40 and 104 bits of the alphanumeric character string are actually used. |
| d) | The alphanumeric character string is combined with a random IV. |
Explanation
WEP keys combine the 40-bit or 104-bit alphanumeric character strings configured by the administrator with a randomly generated 24-bit initialization vector (IV) to create a 64- or 128-bit key.
[5117]
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