多项选择题

What are two design guidelines for VoIP networks？（）

A. Delay should be no more than 10 ms.
B. Loss should be no more than 1 percent.
C. Jitter should be less then 40 ms.
D. Managed bandwidth is strongly recommended for voice control traffic.

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For acceptable voice calls， the packet error rate should be less than（）%

A. 0.01
B. 0.1
C. 1
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What are three primary activities in the cycle of building an enterprise security strategy？（）

A. activity audit
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Which two of these are recommended practices with trunks？（）

A. use ISL encapsulation
B. use 802.1q encapsulation
C. set ISL to desirable and auto with encapsulation negotiate to support ILS protocol negotiation
D. use VTP server mode to support dynamic propagation of VLAN information across the network
E. set DTP to desirable and desirable with encapsulation negotiate to support DTP protocol negotiation.