6.8.9 Practice Questions 802.11 Wireless

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Scenario

Recently, you implemented a wireless network at your home. However, without additional configuration, the wireless access point will allow connections from any laptop or mobile device. You need to secure the wireless network from unauthorized connections. In addition, you suspect that wireless access points used by your neighbours are interfering with your access point. You’ve discovered that they are using channels 2 and 5 for their wireless networks. Your task in this lab is to secure the wireless network as follows: – Use PoliceSurveillanceVan for the SSID. Note: The SSID name is case sensitive. – Disable SSID broadcasts. – Set the channel such that it doesn’t conflict with access points in neighbouring homes. – Use WPA2-PSK authentication, with AES for encryption. Configure S3CuR31! as the security key. Note: The security key is case sensitive. – Only allow devices with following hardware addresses to connect to the wireless network: – 00:87:FC:E2:E5:D2. – 00:50:56:C0:00:08. – 00:87:FC:E2:E5:F2 – Change the administrator authentication credentials on the wireless access point to: – Username: @dm1n – Password: p@SSw@Rd To view and configure the wireless access point, use Internet Explorer and go to 192.168.0.100. Enter username admin and password: password

Procedure

Lab Report

Task Summary Change the wireless network settings. Use PoliceSurveillanceVan for the SSID. Set the wireless channel to 7 or higher. Use WPA2-PSK authentication, with AES for encryption. Configure S3CuR31! as the security key. Filter access by MAC address. Enable MAC address filtering. Add 00:87:FC:E2:E5:D2 to the allow list. Add 00:56:C0:00:08 to the allow list. Add 00:87:FC:E2:E5:F2 to the allow list. Change the wireless access point’s default administrator authentication credentials. Set the username to @dm1n. Set the password to p@SSw@Rd. Explanation Complete the following steps: 1. In the Windows Security pop-up dialogue, click OK. 2. Click Wireless > Basic on the left of the web page. 3. Change the SSID name. 4. Disable SSID broadcasts. 5. Set the wireless channel to 7 or higher. 6. Scroll down and click Apply. 7. In the pop-up dialogue, Click OK. 8. Click Wireless > Security on the left of the web page. 9. Change the authentication (Security Mode) for the PoliceSurveillanceVan SSID. 10. Enter the security key (Pass Phrase), and click Apply. 11. Click Wireless > MAC Filer on the left of the web page. 12. Set the policy to Allow all, then click Apply. 13. In the pop-up dialogue, click OK. 14. In the MAC Address field, enter the first allowed MAC address, then click Apply. 15. Add the remaining allowed MAC addresses in the same manner. 16. Click Administrator > Management on the left of the web page. 17. Change the administrator authentication credentials, and click Apply.

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

MAC address filtering Explanation MAC address filtering allows or rejects client connections based on the hardware address. Wi-Fi Protected Access (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 Explanation 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 Explanation Configure an ad hoc connection to connect one computer directly to another using a wireless connection. An infrastructure configuration users a Wireless Access Point (WAP) to create a network. Devices communicate with each other through the WAP. WEP is a security mechanism used for authentication.

You are designing a wireless network for a client. Your 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 this situation?

802.11n Explanation 802.11n is the best choice for this client. 802.11b and 802.11g both operate in the 2.4 GHz 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, its 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. – Have a maximum bandwidth of 54 Mbps. – Operates in the 2.4 GHz range. Explanation 802.11b provides 11 Mbps bandwidth. 802.11a operates in the 5.75 GHz range. For this reason, 802.11a is not compatible with 802.11b or 802.11g.

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

Near backup generators. Near cordless phones. Explanation 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 WAPs above where most clients are. Explanation Devices often get better reception from WAPs that are above 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 centre of the building decreases the range of the signals available outside of the building. When using multiple WAPs, place access points evenly through the area, taking care to minimize the overlap of the broadcast area while ensuring adequate 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 Explanation 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 he 2.4 GHz frequency range but supports only 11 Mbps transfer speeds.

Which wireless standard has the highest data transfer rates?

802.11n Explanation 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. Your 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 Explanation 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 your client complains runs too slowly. She want 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 Explanation 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. 802.11n 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 will 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 Explanation 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 8022.11a 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 of the following technologies?

Channel bonding to combine more channels in the 5 GHz band to allow for up to 160 MHz wide channels. MU-MIMO to allow multiple users to use the same channel. Explanation 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 user 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.)

Scenario

Recently, you created a wireless network at your home to allow laptops and mobile devices to make a connection to the wired network and the Internet. However, without additional configuration, the wireless access point will allow connections from any laptop or mobile device. Because you recognize this as a vulnerability, you now need to secure the wireless network from unauthorized connections. Your task in this lab is to secure the wireless networks as follows: – Change the settings on the wireless access point: – Use PoliceSurveillanceVan for the SSId. Note: The SSID name is case sensitive. – Use WPA2-PSK authentication, with AES for encryption. – Configure S3CuR31! as the security key. Note: The security key is case sensitive. – Change the administrator authentication credentials on the wireless access point to: – Username: @dm1n. – Password: p@SSw@Rd To view and configure the wireless access point, use Internet Explorer and go to 192.168.0.100. Enter username: admin and password: password.

Procedure

Lab Report

Task Summary Explanation Complete the following steps: 1. In the Windows Security pop-up dialogue, click OK. 2. Click Wireless > Basic on the left of the Web page. 3. Change the SSID. 4. Scroll down and click Apply. 5. In the pop-up dialogue, click OK. 6. Click Wireless > Security on the left of the Web page. 7. Change the authentication (Security Mode) for the PoliceSurveillanceVan SSID. 8. Enter the security key (Pass Phrase), and click Apply. 9. Click Administrator > Management on the left of the Web page. 10. Change the administrator authentication credentials, and click Apply.

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