单项选择题

Which of the following services can an administrator use to reduce latency and prioritize the flowof data?（）

A. Fault tolerance
B. RADIUS
C. Qos
D. Load balancing

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单项选择题Which of the following technologies was designed to provide the FASTEST data rates over analog phone lines?（）

A.RADSL
B.SONET
C.ADSL
D.MPLS

单项选择题Which of the following protocols defaults to port 161?（）

A.SFTP
B.SNMP
C.SMTP
D.SNTP