Which two features are supported by the WLAN Solution Engine （WLSE）？（）

多项选择题WhichthreetrafficdescriptorsaretypicallyusedasQoSmarkingsforpacketsorframesenteringthenetwork？（）

A.protocol type
B.CoS
C.DSCP
D.IP precedence
E.destination address
F.input interface

单项选择题WhatistrueaboutQualityofService（QoS）forVPNs？（）

A.QoS preclassification is only supported on generic routing encapsulation （GRE） and IPsec VPNs
B.QoS preclassification is not required in Layer 2 Tunneling Protocol （L2TP）， Layer2 Forwarding （L2F）， and Point-to-Point Tunneling Protocol （PPTP） VPNs
C.QoS preclassification is supported on IPsec AH VPNs， but not on IPsec ESP VPNs
D.the QoS-for-VPNs feature （QoS preclassification） is designed for VPN transport interfaces
E.with IPsec tunnel mode， the type of service （ToS） byte value is copied automatically from the original IP header to the tunnel header

多项选择题Whatarethreetypesofpacketdelaysthatoccurinanetwork？（）

A.timing
B.queuing
C.differential
D.serialization
E.packetization
F.propagation

多项选择题Whichthreestatementsaretrueaboutthedatatrafficcharacteristicsofvoicetraffic？（）

A.latency must be kept below 150 ms
B.latency is not a concern as long as jitter is kept below 30 ms
C.voice packets do not require a specific type of queuing
D.voice packets are rather small
E.voice packets require TCP for rapid retransmission of dropped packets
F.voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload

多项选择题WhataretwoQoSmechanismsthatareusedtopreventpacketloss？（）

A.header compression
B.payload compression
C.low latency queuing （LLQ）
D.weighted random early detection （WRED）
E.traffic policing
F.traffic shaping