单项选择题
Which of the following attacks occurs when a hijacker intercepts traffic, modifies it, then sends thetraffic?（）
A.DoS
B.Smurf
C.Man-in-the-middle
D.Phishing
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Which of the following is the BEST network device to allow multiple network connections to beterminated in one spot?（）
A. A patch panel
B. A 66 block
C. A smart jack
D. A cross connect -
单项选择题
Which of the following uses TCP?（）
A.DHCP
B.SNMP
C.TFTP
D.IMAP4 -
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
