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Is it possible to deny or prevent or obstruct a network scan on the network where your computer is connected to?

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when you say network scanned what do you mean just not being able to be pinged? – ben950 Jan 11 '12 at 9:37
    
@ben950, meaning that your computer will be able to avoid the scanning and that include any communication such as ping. – Jack Jan 27 '12 at 7:35
up vote 1 down vote accepted

If you don't want your pc to be scanned for open ports or available services, you can use a firewall that closes/stealths the necessary ports. Beware, certain ports wil always be open to be able to communicate with the network.

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First, go to Start Menu->Run window. Type cmd. In the command prompt enter the following commands:

Net config server /hidden:yes

This command will hide you from the Network neighborhood but your shared folders can still be access.

Note: in Windows Vista, you need to open the command Prompt as Administrator: Start Menu > type cmd > Ctrl+Shift+Enter and hit Continue.

or else you’ll get this message:

System error 5 has occurred.

Access is denied.

So how about my IP address? what if they have an ip-scanner, still they can find me?

They can find you by using an ipscanner. The solution for this problem is by using a Firewall. Upgrade to Windows XP Service Pack 2, there is a free inbound protection firewall. For Windows Vista users, there is an inbound and outbound firewall protection by default.

To check if your computer is hidden in the network neighborhood type this in the command prompt:

Net config server

Server Name \\MyPc 
Server Comment

Software version Windows Vista (TM) Ultimate 
Server is active on 
NetbiosSmb (MyPC) 
NetBT_Tcpip_{4365E532-AF25-4C8E-C31E-5D3BG50F7043} (MyPC)

Server hidden Yes 
Maximum Logged On Users 10 
Maximum open files per session 16384

Idle session time (min) 15 
The command completed successfully.

How to Show your Computer Again inside the Network Neighborhood

Net config server /hidden:no

Enjoy!

Note: It only works for windows xp sp2 and up use as admin and open cmd as admin if you can still be found update your pc and install a good firewall like Zone Alarm-Firewall.

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1  
This assumes that the OP runs windows though.We really should ask OP to mention the OS, but since this is a question from 2012 an answer might not be forthcoming. – Hennes Apr 22 at 8:26

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