单项选择题
Which of the following ports should be allowed through a firewall for Telnet to function？（）
A.23
B.25
C.50
D.110
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单项选择题
Which of the following expansion cards would be necessary to increase fault tolerance in a VoIP server?（）
A. Second Modem
B. Second CPU
C. Second HBA
D. Second PBX card -
单项选择题
WhichofthefollowingensurestheMOSTsecureaccesstoaserverroom？（）
A. ID card readers
B. Server rack doors
C. Biometric devices
D. Locked doors -
单项选择题
WhichofthefollowingisanexampleofaprivateIPaddress？（）
A.191.168.5.4
B.111.12.53.2
C.5.2.4.4
D.169.254.15.28
