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

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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

单项选择题

A 100 pair cable is typically used to connect：（）

A.telephony distribution.
B.businesses with more than 75 computers.
C.security cameras.
D.computer labs with more than 20 computers.