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Tools to check network vulnerability ???

Anydoby advise some tools to discover the network vulnerability ? like nmap.

I use nmap to scan one of my networks, I got one message

"TCP Sequence Prediction: Difficulty=258 (Good luck!)"

what's that mean, is is good ?

1 REPLY
Silver

Re: Tools to check network vulnerability ???

I use Nessus for OpenSource.

For comercial products, I use Qualys (Cisco

Partner) or another product from Spirent.

CCIE Security

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