Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,980 --> 00:00:03,490 So what is a port and how does it work. 2 00:00:04,810 --> 00:00:13,680 Well in computer networks hardware connections are terminated physically wired or wireless in software 3 00:00:13,690 --> 00:00:20,890 a port within an operating system is a logical structure that identifies software specific process or 4 00:00:20,890 --> 00:00:32,030 service the ports are identified by 16 bit long numbers of each protocol an address combination. 5 00:00:32,110 --> 00:00:40,540 The most common protocols that use port numbers are the Transmission Control Protocol DCP and the user 6 00:00:40,720 --> 00:00:44,570 data Graham protocol UDP. 7 00:00:44,690 --> 00:00:51,400 Now the port number is always associated with a host IP address and its communication protocol type 8 00:00:54,070 --> 00:01:02,110 completes the destination or source network address of a message in certain port numbers are used for 9 00:01:02,120 --> 00:01:04,040 specific service. 10 00:01:04,040 --> 00:01:10,660 For example port 80 is used by HDP port for 4 3 is used by to be yes. 11 00:01:10,670 --> 00:01:20,620 Protocol so then this way the package can be easily transmitted to the running application the most 12 00:01:20,620 --> 00:01:30,290 commonly used ports are ports one through 10 24 and other ports can be specified to a particular application 13 00:01:31,720 --> 00:01:40,420 the most used default ports so below are the most commonly used default ports in the names of the services 14 00:01:40,420 --> 00:01:41,260 that use them. 15 00:01:42,300 --> 00:01:49,150 Now it's important to remember these ports know them well is because we can understand what the systems 16 00:01:49,180 --> 00:01:52,080 are in the target network when we're scanning. 17 00:01:52,210 --> 00:01:58,830 So according to the port scan results we can plan the next step or if there are services that we know 18 00:01:58,830 --> 00:02:04,800 are used within the target network we can scan directly for these services and then finish the scanning 19 00:02:04,800 --> 00:02:13,090 process without getting caught in the security systems so if Port 21 is open FTB services available 20 00:02:14,350 --> 00:02:24,680 in a port 53 is open DNS services available if Port 1 10 is open there is an S MTV service which means 21 00:02:24,680 --> 00:02:42,440 that mail service is up and running FTB is 21 as h 22 telnet it is always 23 S.M. T.P. 25 DNS UDP 53 22 00:02:43,740 --> 00:03:03,970 age GDP 80 pop 3 1 10 net bios 1 3 9 I'm at 143 S&P UDP 1 6 1 SMB Microsoft DNS UDP 4 4 5 RSA age 5 23 00:03:03,970 --> 00:03:25,750 1 4 VM where 9 0 2 M.S. Eskew 0 1 4 3 3 Oracle D.B. 15 20 one my ASCII Well 33 06 RTP 33 89 VA NC fifty 24 00:03:25,750 --> 00:03:32,930 nine hundred proxy application servers 80 80 in 1881. 3011