单项选择题

You need to troubleshoot some problems in the Company VOIP network associated with jitter.  
What is the cause of jitter？  （）

A. Packet drops
B. Transmitting too many small packets
C. Variable queue delays
D. Compression
E. None of the other alternatives apply

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多项选择题
The Lightweight Access Point Protocol （LWAPP） is in use within the Company wireless network.   Which two statements correctly describe features of this protocol？ （）

A. Control traffic between an access point and a controller is encrypted within LWAPP.
B. Data traffic between an access point and a controller is encrypted within LWAPP.
C. Layer 3 mode packets are transmitted in TCP frames.
D. Data traffic between an access point and a controller is encapsulated within LWAPP.
E. VLAN tagging and QoS markings are applied at the access point.
单项选择题
Which statement about the Lightweight Access Point Protocol （LWAPP） is true？ （）

A. LWAPP encrypts both control traffic and user data.
B. LWAPP encrypts user traffic with an x.509 certificate using AES-CCMP.
C. When set to Layer 3， LWAPP uses a proprietary protocol to communicate with the Cisco  Aironet APs.
D. LWAPP encrypts control traffic between the AP and the controller.
E. None of the other alternatives apply.
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