Hack Security Pro.pdf - Index of

Start the MS-DOS control interface
The first column shows the protocol used in the communication. The second one shows your machine's
address, or its name. After the double dot comes the number of the port used in the communication. The
third column shows the address of the destination machine. After the colon comes the number of the port
used in the communication. The last column shows the state of the communication: whether it is
established, being established, ending, etc.
Note: If a server application such as a Trojan monopolises a port, and an intruder is connected to the
trojan, you will be able to see it thanks to netstat!
IP addressing
Any system wishing to communicate on the global IP network (Internet) must have an IP address. These
addresses, given by regulation bodies, are filed and standardized. An Internet station can only be located
(reached) by its unique couple of addresses (IP address, under-network mask).
IP addresses:
An IP address is made up of two fields: the network address and the machine address. The network
address is calculated on the most significant bits, whereas the machine address is calculated on least
significant ones.
There are several categories of addresses, namely categories A, B, C, D and E. The difference between
them is the number of most significant bits in them.
An IP address always takes the following form: a.b.c.d. In A class, b, c and d values can be freely fixed.
In theory, one can address a maximum of 16,777,216 (2 3x8 =224) machines.
B class leaves the values of c and d free. So one will be able to address 65,536 (2 2x8 =216) machines.
C class leaves only the value of d free. So one will be able to address 256 (28) machines.
D class is a different one, as it is reserved for a particular use: multicasting (broadcasting in real time
towards several destinations).
The Hackademy DMP -19/209- SYSDREAM