Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 111:

  You are testing a new autonomous Cisco Aironet 1260 AP that has booted for the first time on the existing corporate network, which includes voice, data, and location services. How do you reach the GUI of the AP?

  A. HTTP to 10.0.0.1.
  B. HTTP to 192.168.1.1.
  C. HTTP to the DHCP address.
  D. HTTPS to 10.0.0.1.
  E. HTTPS to the 192.168.1.1.
  F. HTTPS to the DHCP address.
  C. HTTP to the DHCP address.

  ---

  Make sure DHCP is enabled on the network or DNS resolution is available. The access point must receive its IP address through DHCP or DNS resolution, and the GUI can be accessed by using HTTP to this address.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/access_point/1260/quick/guide/ap1260getstart.html

• Question 112:

  Which action secures the SNMPv2C protocol in a Cisco WLC?

  A. configure new communities and disable default communities
  B. use digital certificates to authenticate and encrypt transmissions
  C. enable password or transfer encryption
  D. set a username and difficult-to-guess password
  A. configure new communities and disable default communities

  ---

  See the SNMP configuration for Cisco WLC page shown in reference link below:

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7- 4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/ b_cg74_CONSOLIDATED_chapter_0111.html

• Question 113:

  During Layer 2 intercontroller roaming, which two items change? (Choose two.)

  A. SSID
  B. VLAN
  C. IP address
  D. AP
  E. controller
  D. AP
  E. controller

  ---

  

  Figure 14-2 Inter-Controller Roaming

  When the client associates to an access point joined to a new controller, the new controller exchanges mobility messages with the original controller, and the client database entry is moved to the new controller. New security context and associations are established if necessary, and the client database entry is updated for the new access point. This process remains transparent to the user.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-0/configuration/guide/c70/c70mobil.html

• Question 114:

  How many RADIUS servers can be configured globally and per WLAN on a Cisco WLC version 7.0?

  A. 7 global; additional 1 per WLAN
  B. 7 global; additional 3 per WLAN
  C. 17 global; additional 1 per WLAN
  D. 17 global; additional 3 per WLAN
  E. 7 global; reuse of up to 1 maximum per WLAN
  F. 17 global; reuse of up to 1 maximum per WLAN
  G. 17 global; reuse of up to 3 maximum per WLAN
  G. 17 global; reuse of up to 3 maximum per WLAN

  ---

  You can configure up to 17 RADIUS authentication and accounting servers each. For example, you may want to have one central RADIUS authentication server but several RADIUS accounting servers in different regions. If you configure multiple servers of the same type and the first one fails or becomes unreachable, the controller automatically tries the second one, then the third one if necessary, and so on.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-0/configuration/guide/c70/c70sol.html

• Question 115:

  Which three Cisco Unified Wireless Network capabilities use information that is provided by Radio Resource Management neighbor messages? (Choose three.)

  A. aggressive load balancing
  B. dynamic channel assignment
  C. hybrid remote edge access point
  D. inter controller mobility (that is, mobility groups)
  E. over-the-air provisioning
  F. rogue AP classification
  B. dynamic channel assignment
  E. over-the-air provisioning
  F. rogue AP classification

  ---

  First we should learn how the RRM works:

  1) Controllers (whose APs need to have RF configuration computed as a single group) are provisioned with the same RF Group Name. An RF Group Name is an ASCII string each AP will use to determine if the other APs they hear are a part

  of the same system. (RF groups are groups of controllers that share the same RF group name and whose APs can hear the neighbor messages of each other)

  2) APs periodically send out Neighbor Messages, sharing information about themselves, their controllers, and their RF Group Name. These neighbor messages can then be authenticated by other APs sharing the same RF Group Name.

  3) APs that can hear these Neighbor Messages and authenticate them based on the shared RF Group Name, pass this information (consisting primarily of controller IP address and information on the AP transmitting the neighbor message) up

  to the controllers to which they are connected.

  4) The controllers, now understanding which other controllers are to be a part of the RF Group, then form a logical group to share this RF information and subsequently elect a group leader.

  5) Equipped with information detailing the RF environment for every AP in the RF Group, a series of RRM algorithms are used to optimize AP configurations. Information from Radio Resource Management (RRM) monitors the radio resources,

  performs dynamic channel assignments, provides detection and avoidance of interference, and provides the dynamic transmit power control (TPC).

  The RRM neighbor message contains the following information:

  *

  Radio Identifier: If the AP had multiple radios, this field identifies the radio used to transmit the message.

  *

  Group ID: The 16-bit value and controller MAC address. This information is used to detect rogue access points. The access points will then check the beacon/ probe-response frames in neighboring access point messages to see if they contain an authentication information element (IE) that matches that of the RF group. If the check is successful, the frames are authenticated. Otherwise, the authorized access point reports the neighboring access point as a rogue, records its BSSID in a rogue table, and sends the table to the controller.

  *

  WLC IP Address: RF group leader's management IP address. This address is discovered through Over-the-Air Provisioning (OTAP)

  *

  AP Channel: The native channel that the AP uses to service clients.

  *

  Neighbor Message Channel: The channel the message is sent on.

  *

  Power: The power level at which the message is transmitted.

  *

  Antenna Pattern: The antenna pattern currently in use

  Note:

  Dynamic channel assignment is used to dynamically allocate access point channel assignments to avoid conflict and to increase capacity and performance. For example, two overlapping channels in the 802.11g band, such as 1 and 2, cannot

  both simultaneously use 54 Mbps. By effectively reassigning channels, the controller keeps adjacent channels separated, thereby avoiding this problem.

  Over-the-Air Provisioning (OTAP) is a method for APs to discover the management IP of a controller over the air.

  A rogue AP is an AP that is unknown to the controller.

  References:

  http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008072c759.shtml http://www.cisco.com/en/US/docs/wireless/controller/5.2/configuration/guide/c52rrm.html

• Question 116:

  Which statement describes spread spectrum technology in wireless communications?

  A. Signal is spread across optical pulses.
  B. Signal is spread across variations of amplitudes.
  C. Signal is spread across one frequency.
  D. Signal is spread across a whole band of frequencies.
  D. Signal is spread across a whole band of frequencies.

  ---

  spread-spectrum techniques are methods by which a signal with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. Spread spectrum generally makes use of a sequential noise-like signal structure to spread the normally narrowband information signal over a relatively wideband (radio) band of frequencies.

  Reference: http://en.wikipedia.org/wiki/Spread_spectrum

• Question 117:

  A customer mounted three new APs in a small business. After configuring the IP address, users still could not access the web through the new access points. What two configurations are needed to fix this? (Choose two.)

  A. Security parameters
  B. Gateway address
  C. Service Set ID
  D. Antenna option
  E. EAP Authentication
  F. Unique AP Name
  B. Gateway address
  C. Service Set ID

• Question 118:

  What three components must be the same on a controller and the RADIUS server when adding a RADIUS server to a WLC? (Choose three.)

  A. Username
  B. Shared Secret
  C. Index Priority
  D. Port Number
  E. IP Address
  F. Network Mask
  B. Shared Secret
  D. Port Number
  E. IP Address

• Question 119:

  The results of a Cisco WCS client troubleshooting tool are summarized into a simple visual representation of a four-part progression of the connection status for a wireless client. What are the four parts? (Choose four.)

  A. client MAC address
  B. 802.11 authentication
  C. IP address assignment
  D. 802.11 association
  E. successful association
  F. authentication method
  G. SSID
  H. client radio type
  B. 802.11 authentication
  C. IP address assignment
  D. 802.11 association
  E. successful association

  ---

  Please refer to this link for more information about the topic.

  Reference: http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107585-client-con.html

• Question 120:

  What is the function of the Cisco AnyConnect DART tool?

  A. creates a compressed bundle of client logs and information
  B. visualizes a WLAN environment, showing the possible locations of problems
  C. gathers statistics from neighboring clients for comparison to the baseline
  D. helps to troubleshoot a WLAN connection by using easy-to-use wizards and statistic viewers
  A. creates a compressed bundle of client logs and information

  ---

  AnyConnect offers the DART module that can be used to analyze and troubleshoot connections. The information collected by DART can be examined locally or exported and sent to a network support desk for analysis. The DART tool is able to create a bundle to log information for all the wireless clients.

  Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 74