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

单项选择题AcompanywantsallIMchatviatheinternettostop.AtechnicianblocksIRCtrafficwithatrafficshapingdevice，yetIMchatremainsuseable.Whichofthefollowingshouldatechniciandonext？（）

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A100paircableis typicallyusedtoconnect：（）

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

单项选择题WhichofthefollowingisthemaximumtransmissionspeedofCAT5e？（）

A.10Mbps
B.100Mbps
C.1000Mbps
D.10000Mbps

单项选择题Whichofthefollowingroutingprotocolsisalinkstateandusesabackbonecalledarea0？（）

A.OSPF
B.EIGRP
C.BGP
D.IS-IS

单项选择题Whichofthefollowingcablestandardshasamaximumeffectiverangeof25meters（82feet）？（）

A.1000Base-CX
B.1000Base-T
C.1000Base-LX
D.1000Base-SX