单项选择题

Which of the following Internet connection types has the highest amount of latency？（）

A.Satellite
B.DSL
C.Cable
D.Fiber

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单项选择题

Which of the following cable types is the LEAST affected by EMI？（）

A.STP
B.Coax
C.UTP
D.Fiber

单项选择题

Which of the following devices sets the framing type on a T1 circuit？（）

A.Transceiver
B.Gateway Modem
C.Router
D.CSU/DSU

单项选择题

A company wants all IM chat via the internet to stop. A technician blocks IRC traffic with a traffic shaping device， yet IM chat remains useable. Which of the following should a technician do next？（）

A.Block both IRC and ICMP
B.Utilize SNMP to identify IM users
C.Contact the IM carrier to request the IM account be disabled
D.Change the shaping setting to allow minimal traffic to reduce port hopping