Term
| Ad hoc WLANs are also called... |
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Definition
| Independent Basic Service Sets (IBSS) |
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Term
| What is an IBSS wireless network? |
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Definition
| WLAN in which wireless devices communicate directly without a wireless access point (WAP) |
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Term
| Wireless communication on an Infrastructure WLAN occurs how? |
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Definition
| Through one or more wireless access points (WAPs) |
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Term
| Name 4 characteristics of WEP |
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Definition
| clear-text keys; static keys; 1-way authentication (AP to client); weak encryption |
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Term
| What is a Service Set Identifier (SSID)? |
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Definition
| a case-sensitive, 32 character or less name for your wireless LAN (WLAN)which may or may not be broadcast by the access point (AP) |
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Term
| What are the two types of infrastructure WLANs? |
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Definition
Basic Service Set (BSS) - uses a single access point (AP)
Extended Service Set (ESS) - uses multiple access points (APs) |
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Term
| Speed, Range & Frequency: 802.11n |
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Definition
| 200-540 Mbps; indoor 160 ft; 2.4 or 5 Ghz |
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Term
| A Yagi-Uda antenna is also called what? |
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Definition
| point-to-point, or directional antenna. Yagi antennas send the signal in a single direction |
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Term
| What is "Spread Spectrum"? |
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Definition
| Various methods of spreading a signal over a range, or spectrum or frequencies |
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Term
| What is frequency-hopping spread spectrum (FHSS)? |
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Definition
| sender and receiver agree on the range of frequencies to us and the transmission signal is sent over that range. Used by Bluetooth. |
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Term
| What is Direct Sequence Spread Spectrum (DSSS) and which IEEE wireless standards use it? |
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Definition
| The signal is spread over the entire range at once rather than frequency-hopping like FHSS. Used by 11.b, 11.g and 11.n |
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Term
| What is Orthogonal Frequency Division Multiplexing (OFDM) and which IEEE wireless standards use it? |
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Definition
| Splits the signal and sends fragments over different frequencies at the same time. Used by .11a (.11n) |
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Term
| What are some security issues with Wi-Fi Protected Access (WPA)? |
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Definition
MIC will shut down an AP if 2 packets are received (one right after the other) with a bad MIC. a specific DoS attack could exploit this problem.
A dictionary attack could crack a PSK using a small pass phrase |
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Term
| Bluetooth uses what range and what spread spectrum method? |
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Definition
| 2.4Ghz; Frequency Hopping Spread Spectrum (FHSS) |
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Term
| What spread spectrum methods are possible with 802.11n? |
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Definition
Orthogonal Frequency Division Multiplexing (OFDM) or
Direct Sequence Spread Spectrum(DSSS) |
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Term
| Speed, Range & Frequency: 802.11b |
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Definition
| 6.5-11 Mbps; indoor 100 ft; 2.4Ghz |
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Term
| Omni antenna are also known as... |
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Definition
| Omnidirectional and point-to-multipoint and send a signal in all directions. |
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Term
| Name two differences between Wireless and Wired networks. |
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Definition
| Ethernet uses CSMA/CD; wireless uses CSMA/CA. Ethernet can use full- duplex; wireless clients are limited to half-duplex |
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Term
| In an Extended Service Set WLAN (ESS) the access points (APs) create overlapping areas of coverage called what? |
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Definition
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Term
| Speed, Range & Frequency: 802.11g |
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Definition
25-54 Mbps; indoor 100 ft; 2.4Ghz
compatible with 802.11b |
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Term
| Is disabling SSID broadcasting on the access point an effective security measure? |
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Definition
| No since client communication is unencrypted back to the AP and that communication includes the SSID |
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Term
| What 2 forms of authentication does WEP support? |
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Definition
Open - any device can authenticate
Shared Key - AP sends a clear-text challenge, client sends an encrypted response. |
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Term
| What are the strengths of Wi-Fi Protected Access (WPA)? |
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Definition
| 2-way authentication; dynamic keys with stronger encryption (TKIP); 8-byte Message Integrity Check (MIC); Pre-shared keys for authenticaiton |
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Term
| Both WEP and TKIP use the RC4 stream cipher for encryption. What makes TKIP better? |
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Definition
| TKIP protects RC4 keys via per-packet key mixing - every packet has a unique encryption key |
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Term
| Speed, Range & Frequency: 802.11a |
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Definition
| 25-54 Mbps; indoor 100 ft; 5Ghz |
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Term
| Wi-Fi Protected Access 2 (WPA2) is fully secure due to what two technologies? |
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Definition
Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP)
Advanced Encryption Standard (AES) |
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