A sniffer program is a:
a. type of macro-virus
b. small peep-hole in a door or wall to allow a security guard to sniff the area with his or her nose before entering a secure area or location
c. used in a call-back modem
d. a program that records all LAN messages received for later (unauthorized) analysis
e. secure hub program
Ans: d. a program that records all LAN messages received for later (unauthorized) analysis
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