Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 201:

  An AP has been configured for personal wireless access to the Internet. Which item should be configured on the wireless client?

  A. RF channel
  B. BSS
  C. PSK
  D. 802.1X/EAP
  E. broadcast SSID
  F. IBSS
  C. PSK

  ---

  Using Pre-shared keys (PSK) is the easiest and best method for allowing Internet access to a wireless client using an access point.

• Question 202:

  Which option describes why most wireless phones and tablets do not use 802.11a/n and 40 MHz channels?

  A. a lack of radio range when using these radios
  B. a lack of device battery capacity to operate concurrent a/b/g/n radios
  C. a lack of cooling in the device necessary to operate these radios
  D. These radios would require the devices to be larger.
  B. a lack of device battery capacity to operate concurrent a/b/g/n radios

  ---

  A different receiver is needed for each 802.11a, b, g, and n radios, so using all simultaneously would severely impact the overall battery life of a mobile device.

• Question 203:

  Wireless clients are experiencing loss of connectivity while roaming between controllers. To fix this, what configuration should be the same on all controllers within the mobility group?

  A. management interface IP address
  B. IP address of the virtual interface
  C. AP Manager interface IP address
  D. IP address of the Service Port
  B. IP address of the virtual interface

• Question 204:

  Refer to the exhibit.

  

  A customer has enabled the primary DNS server to return the correct controller IP address in response to a CISCO-CAPWAP-CONTROLLER.localdomain request coming from new access points associating to the wireless network. The access points seem to still be receiving the wrong IP address and cannot associate to the primary controller.

  Why are the access points receiving the wrong IP information?

  A. The DHCP option 43 has an incorrect controller IP address configured.
  B. The DNS server must be configured to respond to CISCO-LWAPP- CONTROLLER.localdomain request.
  C. The controller and wireless action point need to be Layer 2 adjacent.
  D. The controller must be configured for DHCP option 15 request.
  A. The DHCP option 43 has an incorrect controller IP address configured.

• Question 205:

  Which type of authentication is used initially by a controller-based AP so that a guest client can get an IP address?

  A. 802.1x
  B. EAP
  C. LEAP
  D. open authentication
  E. TLS
  F. SSL
  D. open authentication

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  Open authentication allows any device to authenticate and then attempt to communicate with the access point. Using open authentication, any wireless device can authenticate with the access point, but the device can communicate only if its Wired Equivalent Privacy (WEP) keys match the access point's WEP keys. Devices that are not using WEP do not attempt to authenticate with an access point that is using WEP. Open authentication does not rely on a RADIUS server on your network.

  Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/wireless/software/guide/SecurityAuthenticationTypes.html#wp1035025

• Question 206:

  When using Cisco WCS version 7.0, which two features are available for the client troubleshooting tool when a Cisco Compatible Extensions v5 wireless client gets connected? (Choose two.)

  A. Request CleanAir reports from the client
  B. Send text messages to the client
  C. Aggregated Cisco ACS authentication client information
  D. Request the client to ping the DHCP-supplied IP gateway
  E. Display a summary of client event history
  B. Send text messages to the client
  D. Request the client to ping the DHCP-supplied IP gateway

  ---

  If Cisco Compatible Extension Version 5 clients are available, a Messaging tab as shown in figure appears. Use this tab to send an instant text message to the user of this client. From the Message Category drop-down list, choose a message and click Send.

  

  Figure 11-20 Messaging Tab

• Question 207:

  A network engineer in the GUI of WCS version 7 wants to add an autonomous access point. Where can this command be found in the drop-down menu?

  A. Configure > Access Point > Add Autonomous APs
  B. Manage > Access Points > Add Autonomous APs
  C. Administration > Access Point > Add Autonomous APs
  D. Location > Access Point > Add Autonomous APs
  A. Configure > Access Point > Add Autonomous APs

  ---

  From WCS, the following methods are available for adding autonomous access points:

  

  Add autonomous access points by Device information (IP addresses and credentials).

  

  Add autonomous access points by CSV file Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/7-0/configuration/guide/WCS70cg/7_0apcfg.html#wp1054452

• Question 208:

  Which three severity levels are in the Cisco WCS alarm dashboard? (Choose three.)

  A. Critical
  B. Flash
  C. Major
  D. Minor
  E. Trivial
  F. Urgent
  A. Critical
  C. Major
  D. Minor

  ---

  Alarms are color coded as follows:

• Question 209:

  Which two algorithms are available in RRM? (Choose two.)

  A. coverage-hole detection
  B. dynamic channel assignment
  C. RSSI normalizer
  D. transmitting channel expander
  E. rogue detection
  A. coverage-hole detection
  B. dynamic channel assignment

  ---

  Here is how Cisco RRM works from a high level:

  

  Wireless LAN Controllers (WLCs) are provisioned with a consistent RF Group Name. This is an ASCII name to identify those WLCs and APs that are all part of the same wireless system.

  

  APs periodically send out RRM Neighbor Messages to each other that are passed up to the Wireless LAN controllers as well. These messages are authenticated for security purposes and provide the controllers with a complete picture of all of the devices in the RF Group. From these devices an RF Group Leader is elected.

  

  Note that these RRM Neighbor Messages play a critical role in other Cisco Unified Wireless Network capabilities such as Over-the- Air Provisioning (OTAP) and Rogue AP Classification.

  

  Once the RF Group is understood, a series of algorithms are run to optimize AP configurations in the RF Group. It is the RF Group Leader that is responsible for these periodic math assignments. (This sounds like a great job for our own Petr Lapukhov!) You should also note that RRM with its RF Grouping is separate and distinct from Mobility Grouping.

  What are the algorithms that the RF Group Leader will be busy with?

  

  Dynamic Channel Assignment Algorithm using metrics of load measurements, noise, interference, signal strength

  

  Transmit Power Control Algorithm

  

  Coverage Hole Detection and Correction Algorithm

  Reference: http://blog.ine.com/2010/10/08/cisco-radio-resource-management-rrm/

• Question 210:

  The network administrator has used VLANs to separate VoIP frames from data frames in the wired network. What must the administrator use to separate those frames in the wireless network?

  A. multiple SSIDs
  B. multiple authentications
  C. multiple WEP or WPA keys
  D. multiple channels
  E. multiple 802.11 radios (a, b, g, n)
  A. multiple SSIDs

  ---

  Multiple IEEE 802.11 service set identifiers (SSIDs) allow you to create different levels of network access and to access virtual LANs (VLANs).You can configure up to 16 separate SSIDs to support up to 16 VLANs. Each VLAN can have a different wireless security configuration so that the devices that support the latest Cisco security enhancements can exist alongside legacy devices. This additional access point functionality enables a variety of users having different security levels to access different parts of the network.

  Reference: http://www.cisco.com/en/US/docs/wireless/access_point/350/configuration/guide/ap350ch1_ps458_TSD_Products_Configuration_Guide_Chapter.html