Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 241:

  Which spread spectrum technique uses 11-bit chips to transmit 1 bit of data over a 22-MHz channel?

  A. DSSS
  B. FHSS
  C. OFDM
  D. MIMO
  E. CCK
  A. DSSS

  ---

  For every 0 or 1 you want to send, DSSS generates a code representing that 0 or that 1. This code, also called symbol or chip, can be a sequence of up to 11 bits (this is called the Barker 11 code), and these 11 bits are sent in parallel over the 22 MHz channel. You can lose up to nine of these 11 bits due to interferences and still understand whether the code sent was supposed to represent a 0 or a 1.

  Reference: Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 23

• Question 242:

  The network administrator receives complaints of slow wireless network performance and performs a sniffer trace of the wireless network in preparation for migration to 802.11n. The sample capture shows frames that contains AP beacons with NonERP_Present bit set to 1 and frames with RTS/CTS.

  Which two conclusions can be interpreted from these frames? (Choose two.)

  A. The network is performing slowly because 802.11n clients are already mixed with 802.11g clients.
  B. The network is performing slowly because 802.11b clients still exist in the network.
  C. The network is performing slowly because a wireless client is incorrectly configured, which results in RF interference.
  D. Possible 802.11b wireless clients are located only in the AP cell radius where the sniffer capture was performed.
  E. Possible 802.11b wireless clients could be located anywhere in the wireless network.
  B. The network is performing slowly because 802.11b clients still exist in the network.
  E. Possible 802.11b wireless clients could be located anywhere in the wireless network.

  ---

  If an ERP AP hears a beacon from an AP where the supported data rates contain only 802.11b or 802.11 DSSS rates, it will enable the NonERP_Present bit in its own beacons, enabling protection mechanisms in its BSS. In simpler terms, if an 802.11g AP hears a beacon frame from an 802.11 or 802.11b access point or ad hoc client, the protection mechanism will be triggered.

  Reference: http://mrncciew.com/2014/11/02/cwap-802-11-protection-mechanism/

• Question 243:

  How are application-specific devices differentiated from laptop computers in the way they support Cisco Compatible Extensions?

  A. ASDs are required to support only Cisco Compatible Extensions v1 and v2 features. Laptops must support all Cisco Compatible Extensions features.
  B. ASDs are required to support only Cisco Compatible Extensions v5 management features, while laptops are required to support optional features.
  C. Several features that are required for laptops are not required for ASDs.
  D. There is no differentiation. ASDs and laptops must both support the same Cisco Compatible Extensions features.
  C. Several features that are required for laptops are not required for ASDs.

  ---

  In each version of CCX some features are classified as optional for ASDs. Examples of ASDs are medical devices, mobile computers, smartphones, and printers. The CCX specification for ASDs is a subset of the CCX specification for

  laptops. Some CCX features are not required for ASDs because many ASDs lack the computing power or operating system foundation required to support the features.

  Reference:

  http://incenter.medical.philips.com/doclib/enc/fetch/2000/4504/577242/577243/577246/581601/711562/ The_Value_of_CCX_for_Philips_PageWriter_Cardiographs.pdf%3fnodeid%3d5784998%26vernum%3d1

• Question 244:

  Which Cisco AnyConnect module allows troubleshooting for core AnyConnect problems?

  A. telemetry
  B. web security
  C. VPN
  D. NAM
  E. DART
  F. posture
  G. CSSC
  E. DART

  ---

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

• Question 245:

  

  

  

  Tablets and other wireless clients are unable to connect at any 802.11 n data rates. What is the most likely cause of this problem?

  A. WLAN > General properties are incorrectly configured.
  B. WLAN > QoS properties are incorrectly configured.
  C. WLAN > Security properties are incorrectly configured.
  D. WLAN > Advanced properties are incorrectly configured.
  E. Wireless > AP > 802.11 a/n is incorrectly configured.
  F. Wireless > 802.11a/n > Network is incorrectly configured.
  C. WLAN > Security properties are incorrectly configured.

  ---

  802.11n only supports open authentication or the use of WPAv2 with AES. From the output shown in this question, we can see that WPA/WPA2 using TKIP has been configured, not AES.

• Question 246:

  An enterprise needs their iPhones to connect to the EAP-TLS network. How should the devices be configured?

  A. push profile and certificate through Configuration Utility
  B. configure directly through Settings application
  C. email certificate to device then configure through Settings application
  D. download certificate from web page then configure through Settings application
  E. push profile and certificate through iTunes
  A. push profile and certificate through Configuration Utility

• Question 247:

  When a guest client is authenticated, which type of connection is created between the controller-based AP and the client?

  A. as SSL connection
  B. a TLS encrypted tunnel
  C. an unsecured connection
  D. a 802.1x/EAP tunnel
  E. an IPsec tunnel
  C. an unsecured connection

  ---

  The wireless network at UNCG allows visitors to establish an unsecured connection. The unsecured network is available as a self-service wireless profile.

  

  This is an open, unsecured network with bandwidth restrictions of 768 Kbps.

  

  Access is restricted to basic Internet use only.

  

  Access is denied to any sensitive UNCG systems.

  Reference: http://its.uncg.edu/Network_Services/Wireless/Connect/Guest/

• Question 248:

  DRAG DROP

  Drag the feature descriptions from the left and drop them onto the corresponding AP operational mode names on the right.

  Select and Place:

  

  

• Question 249:

  To implement a more secure means of communication for voice and data, what technology successfully resists interference by utilizing a wider bandwidth than needed for the transmitting signal?

  A. Spread Spectrum
  B. Microwave
  C. Extended U-NII2
  D. ISM Bands
  A. Spread Spectrum

• Question 250:

  An 802.11g network is experiencing intermittent signal degradation and Spectrum Analyzer is being used to try and locate the problem. What two interferers would likely be identified? (Choose two.)

  A. multiple cell phones
  B. microwave oven
  C. FM Radio
  D. cordless phone
  E. document scanner
  B. microwave oven
  D. cordless phone