CWNP PW0-250 問題集

質問 1：
You are tasked with designing the WLAN to accommodate certain high density areas on your university campus where users are highly transient (frequently come and go). With a limited DHCP pool size (subnet mask = 255.255.252.0) for this WLAN subnet, you want to ensure that your DHCP addresses are used efficiently and are not exhausted, which would prevent new client associations. The DHCP server is a Windows Server 2008 machine. Your design task is to determine the best configuration to allow as many users as possible while avoiding WLAN service interruptions and also to use the available addresses as efficiently as possible.
What setting would be most effective at achieving this design task?
A. Enable mandatory admission control
B. Set the maximum client limit per radio to 64
C. Enable WLAN Controller DHCP relay
D. Set the AES rekey interval to 5 minutes
E. Set the 802.1X re-authentication timer to 10 minutes
F. Set the DHCP lease for this pool to 20 minutes
G. Set the inactive wireless client timeout (client age-out) to 5 minutes
H. Set the RTS threshold to 2346 bytes
正解：F

質問 2：
In this question, you will compare the mobility processes of a network that supports WPA2Personal and WPA2-Enterprise. Assume the use of a 15-character ASCII passphrase for WPA2-Personal and EAP-TTLS/MSCHAPv2 with WPA2-Enterprise. Also, assume that proprietary roaming protocols are not supported.
When a device transitions from one BSS to another within the same ESS, what steps must be performed in the WPA2-Enterprise transition that are not performed in the WPA2Personal transition? (Choose 2)
A. Open System Authentication
B. Conversion of passphrase to PMK
C. 802.11 Reassociation
D. 4-Way Handshake
E. Transfer of PMK from AAA server to authenticator
F. 802.1X authentication
正解：E,F

質問 3：
Given: A WLAN controller is connected to ABC Company's core layer 3 Ethernet switch with an IEEE 802.1Q trunk connection. The WLAN controller's native VLAN is VLAN 6 and its IP address is 10.0.14.2 /24. Lightweight APs supporting centralized forwarding are connected to the network on VLANs 7, 8, and 9, and they each build a layer 3 tunnel back to the WLAN controller's IP address. The dynamically assigned IP addresses received by each AP from a DHCP server will be ________________.
A. Associated with the VLAN on which they are connected.
B. Associated with VLAN 1, the default VLAN for new APs
C. Associated with a non-routable VLAN until the MAC address of the AP is removed from the controller's MAC filter
D. Associated with the native VLAN of the WLAN controller.
正解：A

質問 4：
What exhibit reflects the recommended life-cycle steps for successfully designing and deploying an enterprise WLAN from start to finish? (Choose 2)


A. Solution 3
B. Solution 5
C. Solution 2
D. Solution 4
E. Solution 1
正解：B,E

質問 5：
According to WLAN security design best practices, what is true of the EAP properties shown in the exhibit?

A. The "Validate server certificate" checkbox should be checked if you purchased a third-party SSL certificate for the AS, but left unchecked if you have a self-signed certificate for the AS.
B. The "Validate server certificate" checkbox should always be checked to prevent MITM attacks from rogue authentication servers.
C. The "Do not prompt user to authorize new servers or trusted certification authorities" box should be checked only for administrative users.
D. The "Enable Identity Privacy" checkbox and anonymous name field are only useful for networks supporting EAP-LEAP.
E. The "Trusted Root Certification Authorities" list is provided to identify the certificate that the client should send to the AS for client authentication.
正解：B

質問 6：
You told your customer that multipath fading may be mitigated simply by moving one or both of the receiver's antennas a little bit, usually by one to four wavelengths away from its original position. Your customer is prepared to make the change, but does not know the wavelength for 802.11a.
What is the approximate wavelength of an 802.11a radio wave?
A. 58 cm (22.83 inches)
B. 15.24 cm (6 inches)
C. 12 cm (4.72 inches)
D. 45 cm (17.71 inches)
E. 5.5 cm (2.16 inches)
正解：E