Common Port Assignments

This value varies by operating system, but generally falls between the values 1024-5000-the port numbers classically assigned as ephemeral port numbers- and 49152-65535-the dynamic or private port numbers.In the early days of the Internet, only ports 1024-5000 were used, but modern computers can use up all of those. The Internet Assigned Numbers Authority (IANA) today recommends using only ports 49152-65,535 as ephemeral port numbers.RFC 3232 [Reynolds 2002] gives the location of the online database that replaced RFC 1700: The port numbers are divided into three ranges: for a TCP connection is the four-tuple that defines the two endpoints of the connection: the local IP address, local port, foreign IP address, and foreign port.Tip TCP/IP port numbers between are the well-known port numbers. When a Web client (let's say your computer running Firefox) sends an HTTP ACK to a Web server to request the Web page. The computer running the Web server reads the destination port number, telling it to send the incoming packet to the Web server program.The Web client's source port number is generated pseudo-randomly by the Web client computer.If you have S at the end of a name and the S means secure that means we got it from 'SSL'. You have to log on into your account, you are going to be exchanging credentials with the server. SSL is 443 added to HTTP so the port number HTTPs is 443. This is the protocol with which we send and receive files on the network. Another protocol, very important we look at is RDP. You see on your network you have some devices that have no panels, panels where you could read their configuration parameters so you need SNMP. It's actually 160, 161, 162 for SNMP but the focus is largely 161. We move emails from one server to another server using SMTP. 25, SMTP, it allows your emails to move from one exchange server to another server. When you sit in front of a machine you type the URL, the fully and qualified domain name. We should be careful when we set up POP3, to set it not to delete the emails, let the emails stay on the server. Another protocol for emails is something called IMAP. IMAP also allows me to create folders in my email such that I could archive my emails appropriately. We have looked at SNMP, SMTP, RDP, TELNET, HTTPS, DNS, TFTP, HTTP port 80, IMAP POP3. You want to do network connectivity between two devices on the network, between a node and another node or between a host and a host on the network, we would use ICMP. We would open up our command prompt, you open up your command prompt and you type in the pin command with the name or IP address to the device and you would pin the device.

If you want to pass the Comp TIA Network, you need to know how TCP/IP uses port numbers and you have to memorize a substantial number of common port numbers.

Clients, on the other hand, normally use , that is, short-lived ports.

These port numbers are normally assigned automatically by the transport protocol to the client.

Clients normally do not care about the value of the ephemeral port; the client just needs to be certain that the ephemeral port is unique on the client host.

The transport protocol code guarantees this uniqueness.

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