Cisco 640-722 Online Practice Questions and Exam Preparation

Cisco 640-722 Online Questions & Answers

• Question 81:

  When using the CLI command eping, configured for auto-anchor mobility wireless guest access, which type of packet is tested?

  A. data packets
  B. mobility unencrypted packets
  C. mobility encrypted packets
  D. SNMP control packets
  E. NTP control packets
  A. data packets

  ---

  Make sure that foreign to anchor communication is possible for mobility traffic. You can test this communication with the eping command (which tests data packets sent to the mobility port UDP 16666) and the mping command (which tests Ethernet over IP encapsulation over the tunnel).

  Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 62

• Question 82:

  Which two statements about WiMAX technology are true? (Choose two.)

  A. WiMAX is defined by 802.11i.
  B. Typically, fixed WiMAX networks have a higher-gain directional antenna installed near the client.
  C. WiMAX is capable of working as a long-range system over several miles.
  D. WiMAX works only for licensed frequencies.
  B. Typically, fixed WiMAX networks have a higher-gain directional antenna installed near the client.
  C. WiMAX is capable of working as a long-range system over several miles.

  ---

  WiMAX is defined by 802.16, that is intended for wireless "metropolitan area networks". WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 ?10 miles (5 ?15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 ?300 feet (30 ?100 m). Fixed WiMAX networks typically have a higher-gain directional antenna installed near the client (customer) which results in greatly increased range and throughput. Using 802.11 with high-gain antenna can bridge last-mile gaps, but they require more power. WiMAX operates on both licensed and non-licensed frequencies, providing a regulated environment and viable economic model for wireless carriers. In particular, WiMax operates on the 10- to 66-GHz frequency band, so it doesn't interfere with 802.11 LANs.

• Question 83:

  An engineer is seeing a pattern closest to that of an Isotropic Radiator. What other antenna will produce a similar pattern?

  A. 5 dBi patch
  B. 13.5 dBi Yagi
  C. 2.2 dBi omni
  D. 21 dBi parabolic
  C. 2.2 dBi omni

• Question 84:

  Which four options are the characteristics of the original 802.11 protocol? (Choose four.)

  A. Defined DSSS and FHSS as possible methods for modulation
  B. Designed to operate in the 5 GHz ISM frequency spectrum
  C. The most common deployment is three non-overlapping channels that are 20 MHz wide
  D. The protocol sets the maximum throughput at 1 Mb/s or 2 Mb/s
  E. Defined FHSS and OFDM as possible methods for modulation
  F. The most common deployment is three non-overlapping channels that are 22 MHz wide
  G. Designed to operate in the 2.4 GHz ISM frequency spectrum
  H. The protocol sets the maximum throughput at 1 Mb/s
  A. Defined DSSS and FHSS as possible methods for modulation
  D. The protocol sets the maximum throughput at 1 Mb/s or 2 Mb/s
  F. The most common deployment is three non-overlapping channels that are 22 MHz wide
  G. Designed to operate in the 2.4 GHz ISM frequency spectrum

  ---

  FHSS is still described in the original 802.11 protocol, but another technique was preferred and adopted by all 802.11 networks: Direct Sequence Spread Spectrum. Instead of small channels and a jumping sequence, the information is sent over a wider channel. This channel is 22 MHz wide (if the center frequency is 2.412, this channel spans from 2.401 GHz to 2.423 GHz) and does not move (no hopping, which is why the sequence is said to be direct instead of hopping). Then, over this 22 MHz channel, several bits of information are sent in parallel. If a source of interference affects part of the channel, it will prevent only the bits sent in that frequency from reaching the receiver.

• Question 85:

  Refer to the exhibit.

  

  What is the meaning of the inverted orange triangle (marked "0") in the Alarm Summary tab of Cisco WCS?

  A. number of major alarms
  B. number of minor alarms
  C. number of critical alarms
  D. number of system alarms
  A. number of major alarms

  ---

  Alarms are color coded as follows:

  

  Red -- Critical Alarm

  

  Orange -- Major Alarm

  

  Yellow -- Minor Alarm The Alarm Summary displays the number of current critical, major, and minor alarms. Reference: http://www.cisco.com/c/en/us/td/docs/wireless/wcs/6-0/configuration/guide/WCS60cg/6_0event.html

• Question 86:

  An installation uses a 21dBi parabolic dish. It is connected to the 802.11n radio via low loss antenna coax rated at 4dB loss/100 feet. After testing, it has been determined that 2mW of power will be lost in the cable. An EIRP producing 200mW is desired. What should the transmit power be set to?

  A. 8mW
  B. 3dBm
  C. 3.16mW
  D. 5mW
  C. 3.16mW

• Question 87:

  Which three items are allowed on an Ethernet trunk port? (Choose three.)

  A. autonomous AP
  B. FlexConnect AP
  C. local AP
  D. monitor AP
  E. rogue detector AP
  F. sniffer AP
  G. SE-Connect AP
  H. Cisco WLC
  A. autonomous AP
  B. FlexConnect AP
  E. rogue detector AP

  ---

  A: The basic reason as to why autonomous AP's need trunk ports and lightweight AP's don't does indeed have to do with the capwap tunnel that is used between the AP and the controller.

  B: you can attach the access point that is enabled for FlexConnect to a trunk or access port on the switch.

  E: APs can also be placed in rogue detector mode. In this mode, the rogue detector AP is placed on a trunk port so it can monitor all wired-side connected VLANs, and the AP radios are turned off.

• Question 88:

  

  

  

  What APTx Power Level Assignment would be required to increase power by 3 dBm on 2.4GHz radio?

  A. 1
  B. 2
  C. 3
  D. 4
  E. 5
  F. 6
  G. 7
  H. 8
  D. 4

  ---

  From the output, we can see the current power level setting for the 802.11 bgn (2.4Ghz tab) is set at 5. Based on the following table from Cisco, that would mean the output power is 3 mW:

  

  Here is the power conversion table to go from mW to 3bm:

  

  So, with a power level setting of 5, the output power is is 3mW, or 5 dbm. A power level of 4 would increase it to 6mW, or 8 dbm.

• Question 89:

  A WLAN deployment uses a combination of Cisco Aironet 1260 APs and multiple Cisco 5500 Wireless LAN Controllers to provide wireless LAN access to end- users. The network administrator has decided to use DHCP Option 43 to enable the APs to discover the wireless LAN controllers.

  When configuring the DHCP scope, which format should be used for the Cisco WLC addresses?

  A. a comma-separated ASCII string of Cisco WLC AP-manager addresses
  B. a comma-separated ASCII string of Cisco WLC management addresses
  C. a comma-separated ASCII string of Cisco WLC virtual IP addresses
  D. a hexadecimal string of Cisco WLC AP-manager addresses
  E. a hexadecimal string of Cisco WLC management addresses
  F. a hexadecimal string of Cisco WLC virtual IP addresses
  E. a hexadecimal string of Cisco WLC management addresses

  ---

  Complete these steps in order to configure DHCP Option 43, in the embedded Cisco IOS DHCP server, for all Cisco Aironet APs that run Cisco IOS. This includes all APs except for the VxWorks 1000 Series (see the next section) and the 600 Series OEAP which does not use Option 43.

  1.

  Enter configuration mode at the Cisco IOS CLI.

  2.

  Create the DHCP pool, which includes the necessary parameters such as the default router and server name. This is an example DHCP scope:

  ip dhcp pool

  network

  default-router

  dns-server

  3.

  Add the Option 43 line with this syntax:

  option 43 hex

  The hexadecimal string in step 3 is assembled as a sequence of the TLV values for the Option 43 suboption: Type + Length + Value. Type is always the suboption code 0xf1. Length is the number of controller management IP addresses times

  4 in hex. Value is the IP address of the controller listed sequentially in hex. Reference: http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/97066-dhcp-option-43-00.html

• Question 90:

  Which two actions would you use to begin to troubleshoot an access point that fails to join a wireless LAN controller successfully? (Choose two.)

  A. SSH to the AP.
  B. SSH to the Cisco WCS.
  C. SSH to the Cisco WLC.
  D. Issue the Cisco WLC command debug capwap events enable
  E. Issue the Cisco WLC command show capwap events
  C. SSH to the Cisco WLC.
  D. Issue the Cisco WLC command debug capwap events enable

  ---

  The controller supports the use of the Telnet and Secure Shell (SSH) protocols to troubleshoot lightweight access points. Using these protocols makes debugging easier, especially when the access point is unable to connect to the controller. You can monitor the APs dialog with the controller using the debug capwap family of commands.

  Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 114