Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 141:

  Which statement about configuration of Layer 2 wireless user authentication on a Cisco WLC is true?

  A. Local EAP is used only if an external RADIUS is not configured or is unreachable.
  B. The external RADIUS is used only if local EAP is not configured.
  C. The administrator chooses whether local EAP or an external RADIUS is used first.
  D. The external RADIUS is used only if local EAP is explicitly disabled.
  A. Local EAP is used only if an external RADIUS is not configured or is unreachable.

  ---

  If any RADIUS servers are configured on the controller, the controller tries to authenticate the wireless clients using the RADIUS servers first. Local EAP is attempted only if no RADIUS servers are found, either because the RADIUS servers timed out or no RADIUS servers were configured. If four RADIUS servers are configured, the controller attempts to authenticate the client with the first RADIUS server, then the second RADIUS server, and then local EAP. If the client attempts to then reauthenticate manually, the controller tries the third RADIUS server, then the fourth RADIUS server, and then local EAP.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/ b_cg74_CONSOLIDATED_chapter_0110010.html

• Question 142:

  Which type of management tasks can be completed on a Cisco WLC remotely from a wireless client?

  A. All management and configuration tasks can be performed from a wireless client except for using debug commands.
  B. In the default configuration, no management or configuration is possible through the GUI or CLI on the Cisco WLC.
  C. The default configuration of the Cisco WLC allows only CLI access and then only the use of show commands, so no configuration is possible.
  D. All management and configuration tasks, except uploads from and downloads to the Cisco WLC, are permitted.
  B. In the default configuration, no management or configuration is possible through the GUI or CLI on the Cisco WLC.

  ---

  You can use either the service port interface or the management interface to access the GUI. Cisco recommends that you use the service-port interface. GUI access is not available from a wireless client. You access the controller CLI using one of two methods:

  

  A direct serial connection to the controller console port

  

  A remote console session over Ethernet through the pre-configured service port or the distribution system ports. CLI access from a remote client is not allowed.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/6-0/configuration/guide/Controller60CG/c60intf.html

• Question 143:

  Refer to the exhibit.

  

  Which GUI item do you click to configure authentication and authorization in Cisco WCS?

  A. Security
  B. Monitor
  C. Configure
  D. Services
  E. Administration
  F. Tools
  E. Administration

  ---

  The Administration menu enables you to schedule tasks like making a backup, checking a device status, auditing your network, synchronizing the location server, and so on. You can also choose Logging to enable various logging modules and specify restart requirements. You can also choose AAA for user administration such as changing passwords, establishing groups, setting application security settings, and so on.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/5-2/configuration/guide/WCS5_2cg/5_2wst.html#wp1060607

• Question 144:

  Which governing body analyzes the applications and environments in which wireless networks are used?

  A. EIRP
  B. ETSI
  C. FCC
  D. IEEE
  E. WiFi Alliance
  D. IEEE

  ---

  Hence the various wireless standards prefixed with IEEE. Wireless LANs are described in IEEE 802.11 standard that contains 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac and so forth.

• Question 145:

  What is the equivalent of 26 dBm in milliwatts?

  A. 4 mW
  B. 40 mW
  C. 100 mW
  D. 400 mW
  E. 1000 mW
  D. 400 mW

  ---

  dBm = log10 (mW)*10 mW =10^(dBm/10)

  Samples: 40 dBm=10.00 watts 36 dBm=4.00 watts 30 dBm=1.00 watts 27 dBm=500 milliwatts 26 dBm=400 milliwatts

  Reference: http://www.h-peters.com/dbmtomw.html

• Question 146:

  What are three functions of RRM? (Choose three.)

  A. dynamic channel assignment
  B. detection and avoidance of interference
  C. dynamic antenna polarization
  D. dynamic transmit power control
  E. dynamic controller selection
  F. detection and avoidance of AP client load
  A. dynamic channel assignment
  B. detection and avoidance of interference
  D. dynamic transmit power control

• Question 147:

  A client is attached to the Cisco Unified Wireless Network using controllers. When the client is using WPA2 and EAP authentication, where are the wireless encryption keys located during the active user session? (Choose two.)

  A. on the access point
  B. on the RADIUS server
  C. on the Cisco WCS
  D. on the client
  E. on the Cisco WLC
  A. on the access point
  D. on the client

  ---

  During the Active user session, WEP keys can be located on the access point as well as on the client. Network managers need to provide end users with freedom and mobility without offering intruder's access to the WLAN or the information sent and received on the wireless network. With a WLAN, transmitted data is broadcast over the air using radio waves that travel between client devices, or stations, and access points-the WLAN endpoints on the Ethernet network that link stations to the network. This means that any WLAN client device within an access point service area can receive data transmitted to or from the access point.

• Question 148:

  Refer to the exhibit.

  

  Which option must be chosen if only the WPA is needed?

  A. WPA+WPA2
  B. Static-WEP + 802.1X
  C. 802.1X
  D. CKIP
  A. WPA+WPA2

  ---

  Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access II (WPA2) are two security protocols and security certification programs developed by the Wi-Fi Alliance to secure wireless computer networks.

  Reference: http://en.wikipedia.org/wiki/Wi-Fi_Protected_Access

• Question 149:

  You have an organization that has a growing number of standalone APs. You would like to migrate to lightweight APs and manage them through Cisco WCS.

  Which software platform allows you to make this migration?

  A. The enterprise version of Cisco WCS allows this migration and provides the most flexibility in the number of APs supported.
  B. CiscoWorks WLSE is the only management platform that allows this migration, but it is limited to 500 APs.
  C. You can migrate your network to Cisco WCS single server with the CiscoWorks WLSE upgrade software upgrade.
  D. You can migrate the network by using either the single server or enterprise software platforms, both using the CiscoWorks WLSE upgrade software upgrade.
  C. You can migrate your network to Cisco WCS single server with the CiscoWorks WLSE upgrade software upgrade.

  ---

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/4-1/configuration/guide/wcscfg41/wcswarr.html

• Question 150:

  What are the three primary functions of the Cisco Unified Wireless LWAPP architecture? (Choose three.)

  A. control and management of the CAPWAP
  B. tunneling of VPN clients over the WAN
  C. tunneling of WLAN client traffic to the WLC
  D. collection of 802.1Q trunks
  E. collection of 802.11 data for management
  F. control and management of VTP
  A. control and management of the CAPWAP
  C. tunneling of WLAN client traffic to the WLC
  E. collection of 802.11 data for management

  ---

  Figure below illustrates one of the primary features of the architecture - how Lightweight Access Point Protocol (LWAPP) access points (LAPs) use the LWAPP protocol to communicate with and tunnel traffic to a WLC. Figure 4-2 LAP and WLC Connection

  

  LWAPP has three primary functions:

  

  Control and management of the LAP

  

  Tunneling of WLAN client traffic to the WLC

  

  Collection of 802.11 data for the management of the Cisco Unified Wireless System

  Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/secwlandg20/sw2dg/ch4_2_SPMb.html