默认题库 - CCNP(642-741)

单选题

Which statement describes the WLCv5.2 delivery of a multicast packet from a wired PC source on VLAN_X to a respective wireless client using SSID_X, using a WLAN controller enabled for multicast?（）

A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, and finally to all wireless clients of that Cisco WLC, via wireless multicast.
B. A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, and finally to all wireless clients of that Cisco WLC, via wireless unicast.
C. A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients via wireless multicast.
D. A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients via wireless multicast.
E. A packet is delivered to Cisco WLC and forwarded via multicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joinedwireless clients via wireless unicast.
F. A packet is delivered to Cisco WLC and forwarded via unicast to all of its associated APs, discarded at APs without SSID_X joined wireless clients, and forwarded at APs with SSID_X joined wireless clients via wireless unicast.

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多选题

Which two statements correctly describe a Cisco WLC configuration of Wireless > QoS > Profiles >Wired_QoS_Profiles for an implementation of DSCP or CoS deployment?（）

A. It must always be set on all QoS profile types because this sets the type of markings as either CoS or DSC
B. It is optional if the Cisco WLC attached switch operates on a trust DSCP model.
C. It must be set if the Cisco WLC attached switch operates on a trust CoS model.
D. It sets the EDCF queue used for the radio-transmitted frames.

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单选题

For which WMM queue is U-APSD most beneficial?（）

A. on any of the queues
B. AC_VO
C. AC_VI
D. the strict priority queue

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单选题

What is the Cisco recommended setting for the Cisco Unified Wireless Network WLC Voice Call Admission Control Max RF Bandwidth to support the Cisco Unified Wireless IP Phone 7921G?（）

A. nominally 30 percent to best align with Cisco Unified Communications System recommendations
B. 100 percent to ensure that the VoWLAN calls can use all the available bandwidth, if needed
C. system default of 75 percent
D. 40 to 60 percent
E. voice CAC should be left disabled unless wired QoS is configured

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多选题

What two benefits result from Cisco WLC configuration of DCA for 5-GHz VoWLAN deployments?（）

Avoid channels with microwave oven noise.
B. Manually remove channels not supported by the VoWLAN clients.
C. Avoid 802.11n 40-MHz wide channels.
D. Automatically avoid nearby radar.

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单选题

Which statement correctly describes a wireless client Layer 2 roam from AP1 to AP2 while joined to a multicast stream using Cisco WLC running v5.2?（）

A. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC after AP1 issues an IGMP query.
B. Client issues an IGMP join after association with AP2, allowing AP2 to request a multicast stream from Cisco WLC independent of AP1 multicast member status.
Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, provided that another client has already joined that multicast.
D. Client resumes multicast after association with AP2, because multicast information is sent in mobility exchanges and AP2 is already a member of the multicast group, regardless if any other clients have already joined that multicast.

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单选题

Which explanation describes a wireless client IGMP multicast join request using a Cisco Unified Wireless Network v5.2 architecture of AP to WLAN controller?（）

A. passed by the AP to its connected switch and then forwarded directly to the connected router，which creates an MGID table entry
B. passed by the AP to the WLAN controller and then forwarded to the source PIM-enabled router，which creates an MGID table entry
C. passed by the AP to the WLAN controller， which creates an MGID table entry before forwarding to the directly connected PIM-enabled router
D. passed by the AP to its connected switch and then forwarded to the rendezvous point router，which creates an MGID table entry

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单选题

Which wireless LAN statistics are reported from the Cisco Unified Wireless IP Phone 7921G via a directly connected web browser?（）

A. duplicate sender packets
B. unicast packet retry rate
C. unicast packet retry ratio
D. association rejectio

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单选题

What is the bandwidth requirement of an active duplex wireless call using G.711 codec?（）

A. 64 kb/s
B. 91.2 kb/s
C. 173 kb/s
D. 183 kb/s
E. 211 kb/

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单选题

What is the minimum configuration you must do in order to enable multicast support on the CiscoWireless LAN Controller v5.2?（）

A. Enable the IGMP snooping capability and define the IGMP timeout period.
B. Set the Ethernet multicast mode to Enabled， enable the IGMP snooping capability， and define the IGMP timeout period.
C. Set the multicast monitor function to Enabled， enable the IGMP snooping capability， and define the mandatory data rate to the minimum value supported.
D. Set the Ethernet multicast mode to Multicast and define the multicast group address.

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