Which of the following addresses must be consulted to deliver a message to the correct application program running on a host?
Correct answer: C. port
- A. IP adress
- B. MAC address
- C. port
- D. physical memory address
Explanation
A port number is a logical address that identifies a specific service or application running on a host computer. When a message is sent to a host, it includes the IP address of the destination host and the port number of the target application. This combination ensures that the message gets delivered to the correct program on the host.
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Networking covers LAN, MAN, WAN and wireless networks, network topologies, transmission media, devices such as switches, routers and modems, and the OSI and TCP/IP models. Internet concepts include IP addresses, DNS, URLs, web browsers, email, protocols such as HTTP, HTTPS, FTP and SMTP, and basic network security.
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