More about computer ports.
Basic is that we must now that we have a hardware and software ports.
Firs are used for connect external devices to our computer like mouse, printer, monitor ...
My scripture will be based on to software ports. This ports enable to use of our stocks to other applications and devices. Simplified said this are like door of large skyscraper and through them is possible to enter into rooms. Therefore ports enables communication on physical level of our computer. Here is brought up new theme how computer works. This subject is too extensive so let say just that we have more levels. DOS level is very important for computer. This level supervises entire activity of system. We can even say that this is brain of computer. So DOS all know and all see and if we know correct orders this informations thy say also to us. We can utilize the netstat command to view currently active connections that include ports currently being used. This command most be typed in to command prompt. Hire is an example of commands end explanations:
NETSTAT [-a] [-e] [-n] [-s] [-p proto] [-r] [interval]
-a Displays all connections and listening ports.
-e Displays Ethernet statistics.
-n Displays addresses and port numbers in numerical form.
-p proto Shows connections for the protocol specified by proto; proto may be TCP or UDP.
-s option to display per-protocol statistics
-r Displays the routing table.
-s Displays per-protocol statistics. By default, statistics are shown for TCP, UDP and IP; the
-p option may be used to specify a subset of the default.
interval Redisplays selected statistics, pausing interval seconds between each display. Press CTRL+C to stop redisplaying statistics. If omitted, netstat will print the current configuration information once.
For understanding of got results we must of curse know bases of TCP, UDP, IP, DHCP and NETBIOS protocols