單項選擇題Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual (counter-rotating) ring topology?()

A.DTP
B.RPR
C.SDH
D.CWDM
E.DWDM


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A.FlexLinks
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3.多項選擇題What are three primary activities in the cycle of building an enterprise security strategy?()

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4.多項選擇題Which two of these are recommended practices with trunks? ()

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5.單項選擇題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

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