单项选择题

Data encryption and decryption occurs at which layer of the OSI model?（）

A.Transport
B.Presentation
C.Session
D.Application

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单项选择题

Which of the following is the MOST accurate description of a L2/L3 switch?（）

A. Performs switching and routing duties
B. A router that directly connects to a switch
C. A multi-purpose switch fabric used in full mesh environments
D. A switch that directly connects to a router

单项选择题

A technician would use a physical network diagram to determine:（）

A. the cause of routing errors.
B. the number of switches on the network.
C. the number of users on the network.
D. where network latency will occur.

单项选择题

Which of the following uses PKI?（）

A.Blowfish
B.AES
C.PGP
D.3DES