Which of the following would MOST likely be used with multimode fiber?（）

单项选择题A company has recently received a new ADSL backup Internet connection. Which of the followingwill MOST likely be used between the modem and the ISP?（）

A.PPPoE
B.RAS
C.IPSec
D.MSCHAP

单项选择题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?（）

A.NAT
B.IDS
C.NMAP
D.DMZ

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