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.
单项选择题 WhichofthefollowingisthemaximumtransmissionspeedofCAT5e？（）
单项选择题 Whichofthefollowingroutingprotocolsisalinkstateandusesabackbonecalledarea0？（）
单项选择题 Whichofthefollowingcablestandardshasamaximumeffectiverangeof25meters（82feet）？（）
