Chapter 6.8 802.11 Wireless

Which of the following features on a wireless network allows or rejects client connections based on the hardware address?

Mac address filtering Mac address filtering allows or rejects client connections based on the hardware address. Wi-Fi Protected Access II (WPA2) provides encryption and user authentication for wireless networks. Wired Equivalent Privacy (WEP) also provides security, but WPA2 is considered more secure than WEP. The SSID is the network name or identifier.

Which of the following is used on a wireless network to identify the network name?

SSID Wireless devices use the SSID (Service Set Identification) to identify the network name. All devices on a wireless network use the same SSID. The MAC address is a unique physical device address. The WPA2 Personal passphrase and the WEP key are both mechanisms used to secure wireless communications.

Which type of configuration would you use if you wanted to deploy 802.11n technology to communicate directly between two computers using a wireless connection?

Ad hoc Configure an ad hoc connection to connect one computer directly to another using a wireless connection. An infrastructure configuration uses a Wireless Access Point (WAP) to create a network. Devices communicate with each other though the WAP. WEP is a security mechnism used for authentication.

You are designing a wireless network for a client. You client needs the network to support a data rate of at least 150 Mbps. In addition, the client already has a wireless telephone system installed that operates 2.4 Ghz. Which 802.11 standard will work best in the situation?

802.11n 802.11n is the best choice for this client. 802.11b and 802.11g both operate in the 2.4 Ghx to 2.4835 Ghz range, which will cause interference with the client’s wireless phone system. 802.11a operates in the 5.725 Ghz to 5.850 Ghz frequency range, which won’t interfere with the phone system. However, the maximum speed is limited to 54 Mbps.

Which of the following are characteristics of the 802.11g wireless standard?

Backwards compatible with 802.11b devices Operates in the 2.4 Ghz range Maximum bandwidth of 54 Mbps 802.11g wireless network: -Operates in the 2.4 Ghz range -Have a maximum bandwidth of 54 Mbps -Are backwards compatible with 802.11b networks

Which of the following locations will contribute the greatest amount of interference for a wireless access point?

Near backup generators Near cordless phones Other wireless transmitting devices (such as cordless phones or microwaves) and generators cause interference for wireless access points. In general, place access points higher up to avoid interference problems caused by going through building foundations. DHCP servers provide IP information for clients and will not cause interference.

Which of the following recommendations should you follow when placing wireless access points (WAPs) to provide wireless access for users within your company building?

Place WAP’s above where most clients are. Devices often get better reception from WAPs that are abouve or below. If possible, place WAPs higher up to avoid interference problems caused by going through building foundations. For security reasons, do not place WAPs near outside walls. The signal will extend outside beyond the walls. Placing the WAP in the center of the building decreases the range of the signals available outside of the building. When using multiple WAPs, place access points coverage for all areas.

You have been contacted by OsCorp to recommend a wireless Internet solution. The wireless strategy must support a transmission range of 150 feet, use a frequency range of 2.4 GHz, and provide the highest possible transmission speeds. Which of the following wireless solutions would you recommend?

802.11n Of the technologies listed, only the IEEE 802.11n wireless standard addresses the desired requirements. The 802.11a wireless standard offers maximum speeds of 54 Mbps and uses the 5 Ghz frequency range. The 802.11g wireless standard offers maximum speeds of 54 Mbps. 802.11b uses the 2.4 GHz frequency range but supports only 11 Mbps transfer speeds.

Which wireless standard has the highest data transfer rates?

802.11n 802.11n has the highest data transfer rates, up to (theoretically) 600 Mbps. 802.11a and g have speeds up to 54 Mbps or 108 Mbps when using channel bonding. 802.11b has speeds up to 11 Mbps.

You are designing a wireless network for a client. You client needs the network to support a data rate of at least 54 Mbps. In addition, the client already has a wireless telephone system installed that operates 2.4 GHz. Which 802.11 standards will work best in this situation?

802.11a 802.11n 802.11a or 802.11n are the best choices for this client. While both 802.11a and 802.11g each operate at 54 Mbps, 802.11g operates in the 2.4 GHz to 2.4835 GHz range, which will cause interference with the client’s wireless phone system. 802.11a and 802.11n, on the other hand, operate in the 5.725 GHz to 5.850 GHz frequency range, which won’t interfere with the phone system. 802.11n can operate at speeds up to 300 Mbps.

You are designing an update to your client’s wireless network. The existing wireless network uses 802.11b equipment, which you client complains runs too slowly. She wants to upgrade the network to run at 150 Mbps. Due to budget constraints, your client wants to upgrade only the wireless access points in the network this year.

Next year, she will upgrade the wireless network boards in her users’ workstations. She has also indicated that the system must continue to function during the transition period.

Which 802.11 standard will work best in this situation?

802.11n 802.11n is the best choice for this client. Both 802.11a and 802.11g each operate at a maximum speed of 54 Mbps. 802.11a isn’t compatible with 802.11b network boards. 802.11g access points, on the other hand, are backwards-compatible with 802.11b equipment and run at speeds of up to 300 Mbps. Using this type of access point allow the wireless network to continue to function during the transition.

Which of the following wireless networking standards uses a frequency of 5 GHz and supports transmission speeds up to 1.3 Gbps?

802.11ac The 802.11ac standard uses the 5 GHz frequency and supports data transmission speeds up to 1.3 Gbps. 802.11n supports data transmission speeds up to 600 Mbps. 802.11g and 802.11a both support data transmission speeds up to 54 Mbps. 802.11b supports data transmission speeds up to 11 Mbps.

The 802.11ac wireless networking standard provides increased bandwidth and communication speeds by using which o fthe following technologies?

Channel bonding to combine more channels in the 5GHz band to allow for up to 160 MHz wide channels. MU-MIMO to allow multiple users to use the same channel. The 802.11ac wireless network standard increases bandwidth and communication speeds by using the following technologies: -MU-MIMO is an enhancement to MIMO that allows multiple users to use the same channel. In addition to adding MU-MIMO, 802.11ac doubled the number of MIMO radio streams from four to eight. -Channel Bonding is used to combine even more channels in the 5 GHz band, allowing for up to 160 MHz wide channels. (Even though 160 MHz wide channels are supported, most 802.11ac networks use 80 MHz wide channels.)