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13 What organization provides the licenses for 80211 networks A FCC B IEEE C ANSI D There is no licensing organization for 80211 networks
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D is correct 80211 uses license-free bands, and no organization provides licenses A, B, and C are incorrect While the FCC specifies the allowed communications frequencies, they do not issue licenses, since 80211 uses the ISM and U-NII bands The IEEE designs standards that comply with FCC regulations The ANSI organization does not provide services directly related to 80211 networks
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14 You receive a complaint from a wireless user suggesting that performance on the WLAN is unacceptable When you test, you notice that a high number of retransmissions are occurring Close to the AP, frames are being corrupted; however, close to the client, they are not What is the likely cause A Multipath B Incompatible client C Hidden nodes D Free path space loss
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C is correct These are symptoms of hidden node problems A, B, and D are incorrect Multipath would not show these precise symptoms An incom patible client would not be able to connect at all Free space path loss would result in weakened signals, but not necessarily corruption of frames
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15 What WLAN phenomenon can cause signal degradation and signal cancellation A Dynamic Rate Switching B Multipath C OFDM D ERP
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B is correct Of the items listed, only multipath will cause signal degradation and cancellation A, C, and D are incorrect DRS actually helps improve communications by slowing the data rate OFDM and ERP are physical layers and do not degrade or cancel the signal
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Administering and Optimizing a Wireless LAN
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You are troubleshooting performance problems for a WLAN user After some analysis, you determine that a hidden node problem is the cause What solutions can you offer to the user The following represents one possible solution to the labYour answer may vary You may recommend any of the following to the user:
Use RTS/CTS Increase power output at the clients Remove obstacles Move the clients
Using RTS/CTS will require that all devices communicating with the AP reserve time for frame transfers This will slow overall performance, but it should increase the performance of the hidden nodes Increasing power output at the clients may increase the signal strength enough that they can see each other Removing obstacles may solve the problem if it provides RF LOS for the nodes Finally, the clients may be able to move closer to the AP or each other, and this will also resolve the issue
Security Analysis
CERTIFICATION OBJECTIVES
901 Identify and Describe WLAN Security Techniques
Two-Minute Drill Self Test
9:
Security Analysis
LANs have vulnerabilities that are common to all computer networks, and they have vulnerabilities that are specific to 80211 networks When something is implemented in the same way over and over again, it becomes more likely that someone will eventually discover the weaknesses in that thing if weaknesses exist This is seen in the most popular operating systems and software applications, and it is seen in the most popular WLAN networks, which are 80211-based IEEE 80211 networks showed their biggest security vulnerability when the one real security feature was hacked in the first few years of existence This security feature was WEP (discussed later in this chapter and the next) Other optional configuration parameters have been touted as security features over the years, but either they were never intended as such or vulnerabilities were known from their inception These features include things like MAC filtering and disabling the broadcast of SSIDs from access points As you will see, in these next two chapters, neither of these features provides any real security This chapter will present the inherent weaknesses in standards-based 80211 networks that do not implement the newest version of Clause 8 in a secure fashion based on the solutions first introduced in the 80211 amendment
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