A router that takes the workstations internal IP address and changes it to another IP address whenit sends the data outside of the network is an example of which of the following?（）

单项选择题Which of the following protocols is commonly used for VoIP technology?（）

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

单项选择题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

单项选择题Which of the following defines access for a network?（）

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

多项选择题Which of the following ports would have to be allowed through a firewall to allow SNMP traffic topass on its default port?（） (Select TWO).

A.22
B.23
C.143
D.161
E.162
F.8080

单项选择题Which of the following wiring standards would MOST likely be used to interconnect two devices without the use of a hub or switch?（）

A.568A
B.568B
C.Crossover
D.Loopback