单项选择题

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

A. 0.01
B. 0.1
C. 1
D. 2.5

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多项选择题

What are three primary activities in the cycle of building an enterprise security strategy？（）

A. activity audit
B. administration
C. policy establishment
D. technology implementation

多项选择题

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.

单项选择题

When is the site-to-site remote access model appropriate？（）

A. for multiple ISDN connections
B. for modem concentrated dial-up connections
C. for a group of users in the same vicinity sharing a connection
D. for use by mobile users