QUESTION 51
If the VoWLAN client is a Vocera badge, which Cisco WLC parameter needs to be changed from the default value?

A.    DTIM
B.    Ethernet multicast mode
C.    peer-to-peer block mode
D.    RF group mode
E.    DTPC

Answer: B

QUESTION 52
What are two design considerations for a WLAN to support voice? (Choose two.)

A.    Packet loss is less than one percent.
B.    Signal strength at cell edge is approximately -67 dBm.
C.    End-to-end delay is less than 200 ms.
D.    Cell overlap between APs is 50 percent.

Answer: AB

QUESTION 53
How much overhead is added by CAPWAP encapsulation?

A.    4 B
B.    14 B
C.    28 B
D.    44 B
E.    50 B
F.    60 B

Answer: F

QUESTION 54
Which four statements describe attributes of interactive video? (Choose four.)

A.    Packet loss is limited to 1 percent.
B.    Packet loss is limited to 5 percent.
C.    One-way latency is limited to 150 ms.
D.    One-way latency is limited to a few seconds.
E.    Jitter is limited to 30 ms.
F.    Jitter has no significant requirements.
G.    QoS marking is at CS4.
H.    QoS marking is at AF41.

Answer: ACEH

QUESTION 55
What is the minimum overhead (header plus FCS) added by 802.11 (no encryption, no WMM) between a wireless client and an AP?

A.    18 B
B.    24 B
C.    28 B
D.    35 B
E.    36 B
F.    48 B

Answer: C

QUESTION 56
Which two statements best describe video conferencing? (Choose two.)

A.    Video streams require maximum quality compression and decompression.
B.    Video streams require high-speed compression and decompression.
C.    H.323 codecs are commonly used.
D.    MPEG codecs are commonly used.

Answer: BC

QUESTION 57
In order to place a call, what is the first step that a wireless phone must do?

A.    Associate with the wireless infrastructure.
B.    Authenticate with the web authentication server.
C.    Update its firmware with the Call Manager.
D.    Register with a call agent.

Answer: A

QUESTION 58
VoIP clients can be impacted by jitter. Which of these statements best describes jitter?

A.    Jitter occurs because the receiver buffer is smaller than the sender buffer, thus packets are dropped and voice quality becomes worse.
B.    Jitter is defined as variation in the delay of received packets.
C.    Jitter can be reduced by designing cells that use only the 802.11a frequency band.
D.    A best practice to avoid jitter is to ensure that the end-to-end round-trip time does not exceed 150 ms.

Answer: B

QUESTION 59
Which of these authentication and encryption combinations would be considered the most secure?

A.    LEAP and WPA TKIP
B.    EAP-FAST and WPA2 AES
C.    EAP-FAST and WPA TKIP
D.    WPA-PSK and TKIP

Answer: B

QUESTION 60
What is the main difference between the Cisco Unified Wireless IP Phones 7921G and 7925G?

A.    The 7925G supports 802.11a/b/g, whereas the 7921G supports only 802.11b/g.
B.    The 7925G is suited for a more rugged environment.
C.    The 7925G has support for 802.11n, whereas the 7921G does not.
D.    7925G supports WPA2, whereas the 7921G supports only WPA1.

Answer: B

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