CEH: Gathering Network And Host Information, Types Of Scan

In Hacking the main focus is over gathering the information about victim or victim's machine. Which will help to find out which type of exploit will works according to the given circumstances. Gathering the network and host information means to find out by which network, the which victim's machine is connected and communicating over the network. Moreover, scanning is also performed for gathering information about open and closed ports. After that they'll able to find the vulnerabilities in the target system and try to get access to the system.

Types Of Scan

As a CEH you should know the scan types and uses:

SYN

SYN scan doesn't complete the TCP three way handshake that is why it is known as a half-open scan. An attacker send a SYN packet to the victim machine if SYN/ACK packet is received back to attacker, then it clarify that the port is listening due to the acknowledgment by the victim that it has completed the connection. While if the attacker is received the RST/ACK packet then it assumed that the port is closed or open.

XMAS

XMAS scan works only on target system that has the RFC 793 development of TCP/IP and it doesn't works against any version of windows.
XMAS scan send a packet with by setting up the FIN, URG and PSH flags of the TCP header. The function of this scan is if the port is active there will be no response but if the port is closed the target responds with a RST/ACK packet.

FIN

A FIN scan send a packet by setting up only the FIN flag of the TCP. This scan is similar to XMAS scan. FIN scan receives no response if the port is active while if the port is closed it receives the RST/ACK packet.

NULL 

NULL scan is also similar to the XMAS scan. But the only difference is that it sends a packet without setting up the any flag of TCP header. NULL scan receives no response if the port is open but if the port is closed it receives the RST/ACK packet.

IDLE

It is just like spoofing an IP address by sending a SYN packet to the victim's machine to find out which services are available over the system. This scan is completed with the help of another system called as "Zombie" (that is not receiving or transmitting any information).

More articles

1. Hack Tools For Mac
2. World No 1 Hacker Software
3. Hackers Toolbox
4. Hacking Tools Name
5. Hacking Tools Name
6. What Is Hacking Tools
7. Pentest Tools Port Scanner
8. How To Install Pentest Tools In Ubuntu
9. Hacking Tools Download
10. Hacking Tools 2019
11. Hacking Tools For Kali Linux
12. Hack Tools
13. Pentest Tools Nmap
14. Hacking Tools For Windows 7
15. Pentest Tools
16. Hacker Tools Software
17. What Is Hacking Tools
18. Hacking Tools 2019
19. Hacking Apps
20. Pentest Tools Android
21. Hack Tools For Games
22. Wifi Hacker Tools For Windows
23. Hack Tool Apk No Root
24. Pentest Tools For Ubuntu
25. Hackrf Tools
26. Hacking Tools Hardware
27. Hacker Search Tools
28. Hack Tools For Mac
29. What Is Hacking Tools
30. Hacker Tools For Mac
31. Game Hacking
32. Hacker Techniques Tools And Incident Handling
33. Hacker Tools 2019
34. Android Hack Tools Github
35. Hacker Tools Windows
36. Hacking Tools Mac
37. Hacker Tools Hardware
38. Hack Tool Apk
39. Hacker Tools Free Download
40. Hacking Tools For Windows
41. Hacker Tools Linux
42. Termux Hacking Tools 2019
43. New Hacker Tools
44. Hacking App
45. Wifi Hacker Tools For Windows
46. Hacking Tools For Pc
47. Wifi Hacker Tools For Windows
48. Hacker Tools
49. Hacks And Tools
50. Physical Pentest Tools
51. Game Hacking
52. Pentest Tools Framework
53. Hacking Tools For Mac
54. What Are Hacking Tools
55. Pentest Tools Bluekeep
56. Pentest Tools Android
57. Hacking Tools For Windows 7
58. Pentest Tools Alternative
59. Hacker Tools For Ios
60. Wifi Hacker Tools For Windows
61. Hack And Tools
62. Hack Tool Apk No Root
63. Hack Tools Online
64. Hacking Tools For Pc
65. How To Install Pentest Tools In Ubuntu
66. How To Hack
67. Pentest Tools Linux
68. Pentest Tools Tcp Port Scanner
69. Hacking Tools For Windows
70. Hacker Tools Github
71. Hacker Tools Free
72. Hacking Tools For Pc
73. Hacker Tools For Mac
74. Hacking Tools For Windows