默认题库 - CCNP(642-741)

多选题

For which two of these purposes are Cisco Spectrum Expert used?（）

A. audit VoWLAN cell edge coverage
B. verify RFID tag coverage by four access points at -75 dBm
C. audit microwave oven interference
D. audit 802.11a channel 36 utilization
E. create test scripts for 802.11n bonded channel throughput test

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单选题

Which statement is NOT a key QoS recommended requirement for voice bearer traffic?（）

A. Voice traffic should be marked to DSCP EF per the QoS baseline and RFC3246.
B. Voice traffic loss should be no more than 3%.
C. One-way latency （mouth-to-ear） should be less than 150 msec.
D. Average one way jitter should be targeted to less than 30 msec.
E. 21-320 Kbps of guaranteed priority bandwidth is required per call depending on sample rate，codec，and layer 2 overhead.

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单选题

An LWAPP encapsulated packet is being sent from the Cisco WLC v5.2 to the AP for a wireless WMM client. Can the LWAPP frame be altered to change the resulting final WMM queue for transmission on an 802.11 client?（）

A. Yes，by modifying the LWAPP frame header DSCP value in transit.
B. Yes，by modifying the LWAPP frame header 802.1p value in transit.
C. No，the WMM queue classification parameter is transported inside the LWAPP tunnel.
D. No，the WMM queue classification parameter is determined at the AP based on the original client IP header DSCP value.

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单选题

What is recommended for a wireless LAN infrastructure configuration when using SVP-version SpectraLink phones?（）

A. Disable DTPC on the radio.
B. Disable higher data rates on the radio.
C. Disable WMM policy on the WLA
Disable multicast on the WLA

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多选题

Which three actions are required to access the network statistics on a remote Cisco Unified Wireless IP Phone 7921G via a web browser?（）

A. Browse to the phone using the MAC address of the phone.
B. Use HTTPS:// preceding the address of the phone.
Change web access to read/write for the MAC address of the phone on Cisco Unified Communications Manager.
D. Enter the username and password of the phone.
Ensure that the host is on the same subnet as the remote phone.

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多选题

When designing the coverage area for high call capacity, what two actions should be done with data rates and channels?（）

Avoid channels with high AP co-channel interference.
B. Use channels with high AP co-channel interference to avoid channel roams.
C. Set the 2.4-GHz data rate of 5.5 Mb/s to required.
D. Use 5-GHz channels when possible.
E. Use 2.4-GHz channels when possible.

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多选题

Which three statements are true about load-based Call Admission Control?（）

A. grants a VoWLAN client-initiated call based on the number of active clients associated to the accesspoint
B. grants a VoWLAN client-initiated call based on channel bandwidth capacity
C. uses the 802.11i specification
D. uses 802.11 action frames
E. requires a WMM-enabled client

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单选题

Which statement describes the call behavior of the Cisco Unified Wireless IP Phone 7921G when it roams from 802.11b to 802.11a?（）

A. The phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a new call.
B. The phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a new call.
C. The phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the subnet has not changed.
D. The phone does not roam from 802.11b to 802.11a when on an active call.
E. The phone must switch network profiles to roam from 802.11b to 802.11a.

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单选题

What is the payload size of a wireless IP phone in a call using G.711 codec?（）

A. 20 bytes
B. 60 bytes
C. 120 bytes
D. 160 byte

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多选题

Which three are interframe spaces defined in 802.11?（）

A. SIFS
B. PIFS
C. DIFS
D. LIFS
E. NAV
F. CWmi

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