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A network administrator wants to allow incoming ping packets only from trusted management stations. Which protocol should he use to filter traffic?
UDP
TCP
IP
IPX
ICMP
To allow or deny ping packets, use the IP control protocol ICMP or Internet Message Control Protocol. The IP option means all IP protocols are allowed or filtered. Use UDP if you want to block or allow routing updates or other UDP services such as DNS. Use the TCP option if you want to allow or deny TCP protocols such as FTP, Telnet, SSH, etc.
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