This is an application program that captures all network traffic packets on one collision domain. Sniffer is often used for troubleshooting network or to analyse traffic. However, due to some highly addictive PA g use to send data over the network as clear text (telnet, FTP, SMTP, POP3, etc.)so the sniffer is also a tool for hackers to capture sensitive information such as username, password, and from there can access other components via the network.The ability to perform Packet Sniffers can occur from within the internal network Segment, the Ras connection or arising in the WAN.We can forbid packet sniffer in several ways:Authentication: an authentication technique was made popular as one-type password (OTPs). This technique is made to consist of two elements:p ersonal identification number (PIN) and token cards to verify a device or a software application. Token card is a hardware device or software to produce information at random (with password) at a time, usually in the 60s.Clients will connect password it with a PIN to create a unique password. Retired historian hackers read password that by technique of packet sniffers information that has no value because it has expired.Using a switch instead of a Bridge and hub: limited broadcast packets on the network.This technique is intended to be used to prevent network sniffers in the environment.E.G.: If the entire system using the ethernet switch, hackers are connected. This technique does not completely prevent packet sniffers but it could reduce its influence.
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