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Understand the differences between ad hoc (IBSS) and infrastructure modes Be able to compare BSS/BSA and ESS/ESA: one versus multiple APs When using ESS/ESA, each cell should use a different radio channel

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You should be familiar with the kinds of problems you ll face in a WLAN and common troubleshooting tips to help solve these problems For weak signal problems, the most common solution is to adjust the direction of the radio antenna or to upgrade the antenna to a more powerful one

You should be able to compare and contrast the various security solutions available in WLANs Tables 5-2 and 5-3 are a good place to start Remember that if you disable the SSID broadcast function on the AP, clients

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This chapter focused on the technology of WLANs, which are becoming more and more common in SOHO and company networks today WLAN implementations fall under three general categories: narrowband, broadband, and packet data solutions CSMA/CA is used in wireless to send an RF signal: a device will use Ready-to-Send (RTS) and Clear-to-Send (CTS) signals This is similar to Ethernet s CSMA/CD Many factors can affect signal distortion, including absorption (walls), scattering (rough plaster walls), and reflection (metal file cabinets)

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Two main standards bodies affect wireless: IEEE with its 80211 standard and the Wi-Fi Alliance RF bands commonly used for wireless include 900 MHz, 24 GHz, and 50 GHz 80211 standards defined for WLANs include 80211b (24 GHz at 11 Mbps), 80211a (5 GHz at 54 Mbps), and 80211g (24 GHz at 54 Mbps) 80211b uses DSSS as a transmission method, 80211a uses OFDM, and 80211g supports both A good wireless security solution should include these components: authentication, encryption, and IPS An SSID is used to identify a group of devices in a WLAN APs can disable the broadcast of this, but then you must manually configure this value on the clients WEP is not recommended for use today since its encryption process can be easily broken 8021x provides for secure authentication WPA enhances WEP by performing dynamic per-packet keying for encryption WPA2 offers the most security, relying on AES-CCMP for encryption Personal mode uses PSKs for authentication while enterprise mode uses user credentials such as a username and password Two access modes for WLANs are used: ad hoc (IBSS) and infrastructure Ad hoc is a point-to-point connection between two clients while infrastructure mode uses an AP to interconnect devices The two infrastructure mode implementations are BSS/BSA and ESS/ESA ESS/ESA uses multiple APs, where each cell each individual AP should use a different RF channel

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CSMA/CA uses RTS and CTS RF signals to transmit data Factors that influence signal distortion include absorption, scattering, and

The unlicensed bands used by WLANs include 900 MHz, 24 GHz,

Popular WLAN standards include 80211a, 80211b, and 80211g 80211a uses OFDM as a transmission method, uses a 5 GHz frequency, and

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broadcast this, but if disabled, the WLAN clients must manually configure the SSID value The original security for wireless commonly used MAC address filtering to supplement SSIDs

single AP is used With ESS/ESA, multiple APs are used Each cell in an ESS/ESA topology should be configured with a different RF channel

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The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question

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