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單項選擇題

Which of the following protocols is commonly used for VoIP technology?（）

A.Telnet
B.SMTP
C.SIP
D.SNMP

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單項選擇題

An administrator is experiencing availability issues on a Linux server. The administrator decides tocheck the server for an IP address conflict on the server. Which of the following commands should the administrator use?（）

A.traceroute
B.tracert
C.ifconfig
D.ipconfig

單項選擇題

Which of the following defines access for a network?（）

A.ACL
B.RDF
C.RAS
D.ARP

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