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. Hacker
2. Pentest Tools Windows
3. Pentest Tools For Android
4. Hak5 Tools
5. Hacking Tools Download
6. Hacking Tools For Windows 7
7. Hacker Security Tools
8. Tools Used For Hacking
9. Pentest Tools Download
10. Pentest Tools Free
11. Nsa Hack Tools Download
12. Hacking Tools Mac
13. Tools Used For Hacking
14. Hacker Tools Free Download
15. Growth Hacker Tools
16. Pentest Tools Open Source
17. How To Make Hacking Tools
18. Hackers Toolbox
19. Pentest Tools Port Scanner
20. Pentest Tools Bluekeep
21. Hacking Tools For Pc
22. Hacking Tools Windows 10
23. Pentest Tools Nmap
24. Hacker Tools List
25. Pentest Tools Online
26. Pentest Tools Open Source
27. Pentest Tools Apk
28. Hacker Tool Kit
29. Pentest Tools Subdomain
30. Hacker Tools Github
31. Physical Pentest Tools
32. Pentest Tools Tcp Port Scanner
33. Hacker Search Tools
34. Hack Tools For Mac
35. Pentest Tools Port Scanner
36. Free Pentest Tools For Windows
37. Hack Tool Apk
38. Hacker Tools
39. Hacker Tools 2020
40. Hacker Tools 2020
41. Hacking Tools For Pc
42. Hacking Tools Github
43. Hacking Tools Windows
44. Pentest Tools For Windows
45. Pentest Tools Open Source
46. Usb Pentest Tools
47. Pentest Tools Apk
48. Hack Tools Download
49. Hacking Tools Download
50. Hacker Tools Mac
51. Hack Apps
52. Hacking Tools For Windows
53. Pentest Tools Framework
54. Hacker Tools List
55. Computer Hacker
56. Pentest Tools Website
57. Hackrf Tools
58. Pentest Tools Free
59. Hacker Tools Github
60. Pentest Tools For Mac
61. Hack Tools For Windows
62. Pentest Tools Website Vulnerability
63. Hacking Tools Usb
64. Hacking Tools For Windows 7
65. Hacking Tools 2019
66. Hacker Tools Github
67. Hacker Tools For Ios
68. Pentest Box Tools Download
69. Wifi Hacker Tools For Windows
70. Hacker Tools Software
71. Black Hat Hacker Tools
72. Tools Used For Hacking
73. Pentest Tools Free
74. Pentest Tools For Mac
75. Pentest Tools Subdomain
76. Pentest Tools Online
77. Pentest Tools For Windows
78. Pentest Tools Tcp Port Scanner
79. Pentest Box Tools Download
80. Hack Tools For Games
81. Hacker Tool Kit
82. Best Hacking Tools 2019
83. Pentest Tools Alternative
84. Pentest Tools Free
85. Hacker Tools Software
86. Black Hat Hacker Tools
87. Hacking Tools Windows 10
88. Hacks And Tools