The first 1024 ports are reserved for use by certain privileged services: The FTP server receives the request, generates the response,and sends it to the host’s IP address and port. The host use the locally unused port of 1200 for communication. Because FTP servers use, by default, the well-known port 21, the host generates the request and sends it to the FTP server’s IP address and port. ![]() In the picture above you can see that a host with an IP address of 192.168.0.50 wants to communicate with the FTP server. A client can use any locally unused port number for communication. A client can request the service by pointing the request to the application’s IP address and port. Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) specify the source and destination port numbers in their packet headers and that information, along with the source and destination IP addresses and the transport protocol (TCP or UDP), enables applications running on hosts on a TCP/IP network to communicate.Īpplications that provide a service such File Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP) servers open a port on the local computer and listen for connection requests. The Network ID and the bits used for the Hosts ID.įor each network class A, B or C, there is a defaultĪ port is a 16-bit number used to identify specific applications and services. The mask defines the bits that are used for “masks” the associated IP address assigned with it. Internal network, particularly when the machines getting IP addresses have noĬhance of ever servicing people’s requests on the Internet.Ī subnet mask is another 4-octet, 32-bit address that Where possible, always use private addressing in your ![]() Each number is the decimal (base-10) representation for an eight-digit binary (base-2) number, also called an octet. An IPv4 address is expressed by four numbers separated by dots. IPv4 uses 32 binary bits to create a single unique address on the network. MAC addresses are shown as Hexadecimal numbers from 0 -E. First three bytes are the Vendor ID, The second three bytes are the interface ID
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