How can one protect against password hackers that use sniffers like l0pht?

A. Nowadays, NT administrators face a tough task in ensuring network security,  because of password sniffers such as l0pht, which can sniff an NT password easily. To solve this, one can use a network sniffer that can detect such password sniffers. The network sniffer could log a user running a password sniffer and also issue an alert. An example of such a network sniffer is LANguard:

The user password never leaves the local machine with Win2000 using Kerberos security. It is never exposed to the network so it should not be able to be sniffed.

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