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2021 Jan vce 640-722:
Q181. - (Topic 3)
You are sitting in an airport preparing to use a free WLAN. When you look at the connections in your Windows 7 wireless client, you see a network name and three boxes with a yellow shield.
What does this mean?
A. You cannot connect to this WLAN.
B. An open ad hoc network is nearby.
C. The WLAN in the airport is open.
D. A secure ad hoc network is nearby.
E. A secure WLAN is in the airport.
F. You must provide a username and password to access the WLAN in the airport.
Answer: B
Explanation:
You can connect to a detected network by clicking the wireless connection icon in the status bar, clicking an SSID name (the signal strength of the associated AP is represented by green bars, five bars representing the best signal; an exclamation mark inside a yellow shield is displayed if the SSID has no security [Open authentication, no encryption]), clicking Connect and completing the security parameters when applicable.
Reference: http://www.ciscopress.com/articles/article.asp?p=2131139
Q182. - (Topic 7)
An engineer recently removed a WLC from a WCS, but the APs associated to the WLC are still showing on the WCS. What is a reason for this?
A. The associated APs must be removed manually.
B. The APs must be removed from the WCS map.
C. The hold-down timer must expire before the APs will be removed.
D. The APs must be audited.
Answer: A
Q183. - (Topic 4)
You are configuring SNMPv1/v2c on a WLC. What should you do for improved security?
A. Remove the default SNMPv1 community.
B. Remove the default SNMPv1 and SNMPv2 communities.
C. Remove the default SNMPv2 community.
D. Remove the default SNMPv3 users.
Answer: B
Explanation:
The controller has commonly known default values of "public" and "private" for the read-only and read-write SNMP community strings. Using these standard values presents a security risk. If you use the default community names, and since these are known, the community names could be used to communicate to the controller using SNMP. Therefore, we strongly advise that you change these values.
Step 1
Choose Management and then Communities under SNMP. The SNMP v1 / v2c Community page appears.
Step 2
If “public” or “private” appears in the Community Name column, hover your cursor over the blue drop-down arrow for the desired community and choose Remove to delete this community.
Step 3
Click New to create a new community. The SNMP v1 / v2c Community > New page appears.
Step 4
In the Community Name text box, enter a unique name containing up to 16 alphanumeric characters. Do not enter “public” or “private.”
Step 5
In the next two text boxes, enter the IPv4/IPv6 address and IP Mask/Prefix Length from which this device accepts SNMP packets with the associated community and the IP mask.
Step 6
Choose Read Only or Read/Write from the Access Mode drop-down list to specify the access level for this community.
Step 7
Choose Enable or Disable from the Status drop-down list to specify the status of this community.
Step 8
Click Apply to commit your changes.
Step 9
Click Save Configuration to save your settings.
Step 10
Repeat this procedure if a “public” or “private” community still appears on the SNMP v1 / v2c Community page.
Q184. - (Topic 6)
Which option lists the key features of Cisco Compatible Extensions v5?
A. Roaming and real-time diagnostics, MFP, a diagnostic channel that allows troubleshooting of the client, client reporting, optional location service, and expedited bandwidth
B. AP assisted roam, Cisco Centralized Key Management, radio measurements, and transmit power control
C. CAC, UPSD, voice metrics, MBSSIDs, location, link tests, and NAC
D. WME, proxy ARP, EAP-FAST, and WPA2, and single sign-on
E. LEAP, WPA, 802.1x and VLANs per AP, TKIP, and WiFi
Answer: A
Explanation:
CCXv5 provides for the following:
Client Troubleshooting “Diagnostic Channel”
Client Reporting
Roaming & Real-time Diagnostics
Management Frame Protection
Location Services (Optional)
Expedited Bandwidth Request (Optional)
Interpretation of status and result codes
Performance
Cisco Infrastructure IE
Compliance with CCX v1-4.
Reference: http://www.cisco.com/web/partners/downloads/765/ccx/Comp_Ext_Cust_Preso.pdf
Up to the minute ccna wireless 640-722 iuwne quick reference:
Q185. - (Topic 1)
How many dBm is 40 mW?
A. 10 dBm
B. 16 dBm
C. 20 dBm
D. 22 dBm
E. 40 dBm
Answer: B
Explanation:
The dB measures the power of a signal as a function of its ratio to another standardized value. The abbreviation dB is often combined with other abbreviations in order to represent the values that are compared. Here are two examples:
dBm — The dB value is compared to 1 mW.
dBw — The dB value is compared to 1 W.
You can calculate the power in dBs from this formula:
Power (in dB) = 10 * log10 (Signal/Reference)
This list defines the terms in the formula:
log10 is logarithm base 10.
Signal is the power of the signal (for example, 50 mW).
Reference is the reference power (for example, 1 mW).
Here is an example. If you want to calculate the power in dB of 50 mW, apply the formula in order to get:
Power (in dB) = 10 * log10 (50/1) = 10 * log10 (50) = 10 * 1.7 = 17 dBm
Because decibels are ratios that compare two power levels, you can use simple math in order to manipulate the ratios for the design and assembly of networks. For example, you can apply this basic rule in order to calculate logarithms of large numbers:
log10 (A*B) = log10(A) + log10(B)
If you use the formula above, you can calculate the power of 50 mW in dBs in this way:
Power (in dB) = 10 * log10 (50) = 10 * log10 (5 * 10) = (10 * log10 (5)) + (10 * log10(10)) =
7 + 10 = 17 dBm
Reference: http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/23231-powervalues-23231.html
Q186. - (Topic 4)
Which Extensible Authentication Protocol types are supported by the Cisco Unified Wireless Network?
A. EAP-TLS, PEAP-MSCHAPv2, and PEAP-GTC only
B. LEAP and EAP-FAST only
C. EAP-TLS, PEAP-MSCHAPv2, PEAP-GTC, LEAP, and EAP-FAST only
D. any EAP supported by the RADIUS authentication server
Answer: D
Explanation:
Extensible Authentication Protocol, or EAP, is an authentication framework frequently used in wireless networks and point-to-point connections. EAP is an authentication framework providing for the transport and usage of keying material and parameters generated by EAP methods. There are many methods defined by RFCs and a number of vendor specific methods and new proposals exist. EAP is not a wire protocol; instead it only defines message formats. Each protocol that uses EAP defines a way to encapsulate EAP messages within that protocol's messages.
http://en.wikipedia.org/wiki/Extensible_Authentication_Protocol.
Q187. - (Topic 1)
Refer to the exhibit.
At which point in the network topology must the trunk be configured to support multiple SSIDs for voice and data separation?
A. A
B. B
C. C
D. D
Answer: D
Explanation:
Controllers typically map WLANs to VLANs. When configuring a switch port to a controller, you would set the port to support 802.1Q (switchport trunk encapsulation dot1q), then set the port to trunk (switchport mode trunk) and only allow the VLANs needed by the controller (for example, switchport trunk allowed VLANs 10,20,30 if your controller needs only VLANs 10, 20, and 30).
Reference: CCNA Wireless (640-722 IUWNE) Quick Reference Guide page 111
Q188. - (Topic 4)
Refer to the exhibit.
What does the yellow shield with the exclamation mark indicate?
A. The network uses open authentication and no encryption.
B. The network uses an unsupported channel.
C. The signal is too distorted to connect.
D. The AP that is transmitting this SSID uses the wrong RF domain.
E. This is the ad-hoc network.
Answer: A
Explanation:
an exclamation mark inside a yellow shield is displayed if the SSID has no security [Open authentication, no encryption]), clicking Connect and completing the security parameters when applicable.
Q189. - (Topic 2)
Which Cisco WLC command family can help to troubleshoot communication between an AP and the WLC?
A. (Cisco Controller) >debug capwap
B. (Cisco Controller) >debug ap
C. (Cisco Controller) >debug cac
D. (Cisco Controller) >debug dot11
Answer: A
Explanation:
Example debugs available for this shown below:
WLC side debug commands:
(Cisco Controller) >debug capwap?
. events Configures debug of CAPWAP events and state
. errors Configures debug of CAPWAP errors
. detail Configures debug of CAPWAP detail
. info Configures debug of CAPWAP info
. packet Configures debug of CAPWAP packet
. payload Configures debug of CAPWAP payloads
. hexdump Configures debug of CAPWAP payloads
Reference: https://mrncciew.files.wordpress.com/2013/03/brkewn-3011-troubleshooting-wireless-lans.pdf