10 tips on How to 640-722 Test Like a Badass [111 to 120]

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2016 May 640-722 Study Guide Questions:

Q111. - (Topic 1) 

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. 

Answer: D 


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 

Q112. - (Topic 4) 

Which EAP protocol requires a certificate only on the server side? 





Answer: A 


PEAP is not an encryption protocol; as with other EAP types it only authenticates a client into a network. PEAP uses only server-side public key certificates to authenticate clients by creating an encrypted SSL/TLS tunnel between the client and the authentication server, which protects the ensuing exchange of authentication information from casual inspection. 

Reference: http://wiki.freeradius.org/protocol/EAP-PEAP 

Q113. - (Topic 7) 

To mitigate DoS attacks on a network, what security method should be implemented? 


B. 802.1x 

C. Non-broadcast SSID 

D. Client MFP 

Answer: D 

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Q114. - (Topic 5) 

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 

Answer: A 


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 

Q115. - (Topic 1) 

Which type of basic radiation pattern does a Yagi antenna have? 

A. circular 

B. semicircular 

C. straight line 

D. cone 

Answer: D 


High gain directional antennas: A point to point high gain antenna is a directional antenna that has a focused radiation pattern. The radiation pattern is typically a cone 10 to 30 degrees wide. A yagi and a parabolic dish are examples of high gain directional antennas. 

Reference: http://www.hp.com/rnd/pdfs/antenna_tech_brief.pdf 

Q116. - (Topic 6) 

A network engineer is troubleshooting a LAP that is unable to join the controller and receives the message below: 

LWAPP_CLIENT_ERROR_DEBUG. No more AP manager IP addresses remain. 

What does the log indicate? 

A. Two or more LAPs have the same IP address. 

B. An AP manager has the same IP address as another AP manager. 

C. A LAP has the same IP address as the AP manager. 

D. Two or more controllers have the same IP address. 

Answer: C 


Problem 13: Duplicate IP address in the network 

This is another common issue that is seen when the AP tries to join the WLC. You might see this error message when the AP tries to join the controller. 

No more AP manager IP addresses remain 

One of the reasons for this error message is when there is a duplicate IP address on the network that matches the AP manager IP address. In such a case, the LAP keeps power cycling and cannot join the controller. 

The debugs will show that the WLC receives LWAPP discovery requests from the APs and transmits a LWAPP discovery response to the APs. However, WLCs do not receive LWAPP join requests from the APs. 

In order to troubleshoot this issue, ping the AP manager from a wired host on the same IP subnet as the AP manager. Then, check the ARP cache. If a duplicate IP address is found, remove the device with the duplicate IP address or change the IP address on the device so that it has a unique IP address on the network. 

The AP can then join the WLC. 

Reference: http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/99948-lap-notjoin-wlc-tshoot.html 

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Q117. - (Topic 4) 

Which statement describes a security weakness of a WPA2 with a PSK? 

A. The compromised key can be used for another connection. 

B. The key can be eavesdropped from the wireless medium. 

C. The key can be recreated from a few eavesdropped frames. 

D. The key is not case-sensitive and is vulnerable to compromise by brute-force methods. 

Answer: A 


WPA2-Enterprise is (in my opinion) considerably more secure than PSK. Reasons 

. WPA2-PSK has a single shared key amongst all devices. That means that if one of the devices is compromised the key is lost, so the more devices you have the risk of loss or compromise increases. As against this WPA2-Enterprise has per user secrets, so not the same problem. 

. Using WPA2-Enterprise each user can change their credentials as required, whereas with WPA2-PSK changing the secret could be a major undertaking, depending on the size and make-up of the user/device population. This increases the potential severity of a compromise as key rotation will be much slower (in most cases) than password rotation so if a credential is compromised, it's likely to remain so for longer with PSK. 

. With WPA2-Enterprise you can make use of stronger authentication mechanisms (e.g. 2-factor if needed) 

. With WPA2-Enterprise you can add certificate authentication to stop random attackers brute-forcing the users creds to get access. 

Q118. - (Topic 5) 

What is the maximum number of access points supported on Cisco WCS with an enterprise license? 

A. 5,000 

B. 10,000 

C. 50,000 

D. 100,000 

Answer: C 


Enterprise Server License (Multiple Servers) Overview (release 4.1 or later) 

. License: WCS-ENT-PLUS-K9 

. License increments: 1000, 2500, 10000, 50000 

. Single or multiple server deployment (Cisco WCS Navigator included in 10000, and 50000 licenses) 

. Suitable for customers deploying 500 or more Cisco Aironet lightweight access points 

. Multiple license files linked to a single PAK certificate 

. Server decrements available number of access points as licenses are allocated within the network 

Reference: http://www.cisco.com/c/en/us/products/collateral/wireless/wireless-control-system/product_data_sheet0900aecd804b4646.html 

Q119. - (Topic 1) 

Access points must discover a wireless LAN controller before they can become an active part of the network. In which order does an access point try to discover a controller? 

A. Layer 3 CAPWAP or LWAPP broadcast discovery 

DHCP option 43 

Locally stored controller IP address discovery 

DNS controller name resolution 

B. Layer 3 CAPWAP or LWAPP broadcast discovery 

Locally stored controller IP address discovery 

DNS controller name resolution 

DHCP option 43 

C. Layer 3 CAPWAP or LWAPP broadcast discovery 

Locally stored controller IP address discovery 

DHCP option 43 DNS controller name resolution 

D. DNS controller name resolution 

DHCP option 43 

Layer 3 CAPWAP or LWAPP broadcast discovery 

Locally stored controller IP address discovery 

Answer: C 


The different methods by which the access point (AP) discovers the controller are: 

. The AP issues a DHCP DISCOVER in order to obtain an address. 

. Layer 2 attempts LWAPP WLAN controller discovery and Ethernet broadcast. 

. Layer 3 attempts LWAPP WLAN controller discovery: 

. uk.co.certification.simulator.questionpool.PList@f65afb0 

Reference: https://supportforums.cisco.com/document/8446/how-configure-lightweight-ap-order-join-respective-wlan-controller 

Q120. DRAG DROP - (Topic 4) 

Drag the 802.11 functional responsibility in the Cisco “Split MAC” design from the left and drop it on a platform on the right. 


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