Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 181:

  Refer to the exhibit.

  

  Which two statements about the status of the respective AP on a Cisco WCS version 7.0 map does this icon represent? (Choose two.)

  A. The 802.11a/n radio is administratively disabled.
  B. The 802.11a/n radio has a minor fault.
  C. The 802.11a/n radio has a major fault.
  D. The 802.11b/g/n radio is administratively disabled.
  E. The 802.11b/g/n radio has a minor fault.
  F. The 802.11b/g/n radio has a major fault.
  B. The 802.11a/n radio has a minor fault.
  F. The 802.11b/g/n radio has a major fault.

  ---

  The icon with the top half yellow and the lower half red indicates that the optional 802.11a Cisco Radio (top) has a minor fault, and the 802.11b/g Cisco Radio (bottom) has a major or critical fault. The worst of the two Cisco Radio colors determines the color of the large triangular pointer.

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/7-0MR1/configuration/guide/WCS70MR1/maps.html#wp1090761

• Question 182:

  Refer to the exhibit.

  

  Which two menus do you click to determine the reachability status of a controller from Cisco WCS? (Choose two.)

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

  ---

  Monitor Menu

  The Monitor menu provides you with a top-level description of the devices on your network. You can monitor your network, maps, Google Earth maps, various devices (controllers, access points, clients, tags, chokepoints, Wi-Fi TDOA

  receivers), RRM, alarms, and events.

  Configure Menu.

  The Configure menu enables you to configure templates, controllers, access points, Ethernet switches, chokepoints, Wi-Fi TDOA receivers, config groups, auto provisioning, scheduled configuration tasks, profiles, ACS view servers, and

  TFTP servers on your network.

• Question 183:

  When using multiple SSIDs on a lightweight AP, how does the traffic of each SSID reach the 802.3 network?

  A. provide routing between them at the core so that the SSIDs can reach the internet
  B. configure 802.11q trunking on the Ethernet switch port that is connected to the AP
  C. configure ACLs at the switch port that will allow all desired SSIDs to pass traffic
  D. configure the SSIDs on the WLC and it will regulate the traffic based on traffic type
  B. configure 802.11q trunking on the Ethernet switch port that is connected to the AP

• Question 184:

  What technology consists of small, low-power digital radios?

  A. LTE
  B. WiFi
  C. ZigBee
  D. Bluetooth
  C. ZigBee

  ---

  ZigBee is based on the IEEE 802.15.4 protocol for WPAN, and aims at developing hardware and applications with a low data rate but also low power consumption and low complexity -- for example, to control sensors. ZigBee-based products can access up to 16 separate 5 MHz channels in the 2.4 GHz band and are not compatible with 802.11 devices. The maximum power of ZigBee is 60 mW. Devices use low consumption most of the time but can spike when needed: The impact on wireless networks can then be significant.

  Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 39

• Question 185:

  Which statement best describes the ability of a wireless client to access and transmit a data frame to an AP?

  A. The client listens to the media until polled by the AP using PCF to send its data.
  B. The client listens to the media until a data frame is finished, at which time it transmits, unless a collision of data frames has occurred.
  C. The client uses random countdown timers to start the transmission of a data frame.
  D. The client listens to the media and countdown timers to start the transmission of a data frame.
  D. The client listens to the media and countdown timers to start the transmission of a data frame.

  ---

  The figure below illustrates the transmission of a frame. In the figure, Station A wants to send a frame. As the process goes, both the physical and virtual carrier need to be free. This means the client has to listen. To listen, the client chooses a random number and begins a countdown process, called a backoff timer. The speed at which the countdown occurs is called a slottime and is different for 802.11a, b, and g.

  

  Reference: http://www.ciscopress.com/articles/article.asp?p=1271797andseqNum=2

• Question 186:

  Cisco Client Management Frame Protection is running on a mobility group with two controllers.

  Which two MFP requirements protect the network? (Choose two.)

  A. forces clients to authenticate, using a secure EAP method only
  B. implements the validation of wireless management frames
  C. requires Cisco Compatible Extensions v5
  D. requires the use of a nonbroadcast SSID
  E. requires Cisco Compatible Extensions v4
  B. implements the validation of wireless management frames
  C. requires Cisco Compatible Extensions v5

  ---

  Client MFP encrypts class 3 management frames sent between APs and Cisco Compatible Extension version 5 (CCXv5) -- capable client stations, so that both AP and client can take preventive action by dropping spoofed class 3 management frames (management frames) that are passed between an AP and a client station that is authenticated and associated). Client MFP leverages the security mechanisms defined by IEEE 802.11i to protect class 3 unicast management frames. The unicast cipher suite that is negotiated by the STA in the reassociation request's Robust Security Network Information Element (RSNIE) is used to protect both unicast data and class 3 management frames. An AP in workgroup bridge mode, repeater mode, or no-root bridge mode must negotiate either Temporal Key Integrity Protocol (TKIP) or Advanced Encryption Standard-Cipher Block Chaining Message Authentication Code Protocol (AES-CCMP) to use Client MFP.

  Management Frame Protection operation requires a wireless domain service (WDS). MFP is configured at the wireless LAN solution engine (WLSE), but you can manually configure MFP on an AP and WDS.

  Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/3200/software/wireless/3200WirelessConfigGuide/ManageFrameProt.html

• Question 187:

  What authentication method requires a certificate on both the client and authentication server?

  A. PEAP
  B. EAP-TLS
  C. EAP-FAST
  D. WPA-PSK
  E. WEP
  F. EAP-TTLS
  B. EAP-TLS

• Question 188:

  Which encryption algorithm does WPA use?

  A. RC4
  B. DES
  C. AES
  D. DH5
  A. RC4

  ---

  The RC4 Encryption Algorithm, developed by Ronald Rivest of RSA, is a shared key stream cipher algorithm requiring a secure exchange of a shared key. The symmetric key algorithm is used identically for encryption and decryption such that the data stream is simply XORed with the generated key sequence. The algorithm is serial as it requires successive exchanges of state entries based on the key sequence. Hence implementations can be very computationally intensive. The RC4 encryption algorithm is used by standards such as IEEE 802.11 within WEP (Wireless Encryption Protocol) using 40 and 128-bit keys. Published procedures exist for cracking the security measures as implemented in WEP.

  Reference: http://www.vocal.com/cryptography/rc4-encryption-algoritm/

• Question 189:

  Which CLI command is used on a Cisco WLC to troubleshoot mobility, rogue detection, and load-balancing events?

  A. debug dot11
  B. debug capwap all
  C. show dot11 details
  D. show capwap details
  A. debug dot11

  ---

  ebug dot11

  To configure the debugging of 802.11 events, use the debug dot11 command.

  debug dot11 { all | load-balancing | management | mobile | nmsp | probe | rldp | rogue | state} { enable | disable}

  Syntax Description

  

  Reference: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-3/command/reference/cr73/b_cr_7-3_chapter_010.html#wp3619872221

• Question 190:

  Refer to the exhibit.

  

  In WCS, what Monitor submenu would provide the table shown?

  A. Clients
  B. Access Points
  C. Controllers
  D. Security
  E. Alarms
  A. Clients