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2. Christmas tree packet - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_packet

   When used as part of scanning a system, the TCP header of a Christmas tree packet has the flags FIN, URG and PSH set. [1] Many operating systems implement their compliance with the Internet Protocol standards [2] [3] in varying or incomplete ways. By observing how a host responds to an odd packet, such as a Christmas tree packet, inferences can ...

3. Nmap - Wikipedia

   en.wikipedia.org/wiki/Nmap

   Nmap is used for network reconnaissance and exploitation of the slum tower network. It is even seen briefly in the movie's trailer. The command Nmap is widely used in the video game Hacknet, allowing to probe the network ports of a target system to hack it. In Snowden, Nmap is used in the aptitude test scene about 14 minutes into the movie.

4. Idle scan - Wikipedia

   en.wikipedia.org/wiki/Idle_scan

   nmap -v -O -sS 192.168.1.0/24. This tells nmap to do a ping sweep and show all hosts that are up in the given IP range. Once you have found a zombie, next you would send the spoofed packets: nmap -P0 -p <port> -sI <zombie IP> <target IP> The images juxtaposition show both of these stages in a successful scenario.

5. Footprinting - Wikipedia

   en.wikipedia.org/wiki/Footprinting

   That is the reason by which it may be named a Pre-Attack, since all the information is reviewed in order to get a complete and successful resolution of the attack. Footprinting is also used by ethical hackers and penetration testers to find security flaws and vulnerabilities within their own company's network before a malicious hacker does.

6. Virtual private network - Wikipedia

   en.wikipedia.org/wiki/Virtual_private_network

   Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not controlled by the entity aiming to implement the VPN) or need to be isolated (thus making the lower network invisible or not directly usable).

7. TCP reset attack - Wikipedia

   en.wikipedia.org/wiki/TCP_reset_attack

   A TCP reset attack, also known as a forged TCP reset or spoofed TCP reset, is a way to terminate a TCP connection by sending a forged TCP reset packet. This tampering technique can be used by a firewall or abused by a malicious attacker to interrupt Internet connections.