Which port is used by the Echo service by default?

Which port is used by the Echo service by default?

• A. 7
• B. 53
• C. 80
• D. 443

Answer: (A)

The main idea is that each service on the network has a specific port assigned to it, with the Echo Protocol having its own dedicated port. This port is the Echo port, assigned by IANA for the Echo service. When data is sent to this port, the server simply echoes it back, which is what the Echo service is designed to do. That’s why this port is the correct default choice for the Echo service. The other options map to different, well-known services: one is used for name resolution (DNS), one for standard web traffic (HTTP), and the other for secure web traffic (HTTPS). They don’t correspond to the Echo Protocol, so they aren’t the default port for the Echo service.

The main idea is that each service on the network has a specific port assigned to it, with the Echo Protocol having its own dedicated port. This port is the Echo port, assigned by IANA for the Echo service. When data is sent to this port, the server simply echoes it back, which is what the Echo service is designed to do. That’s why this port is the correct default choice for the Echo service.

The other options map to different, well-known services: one is used for name resolution (DNS), one for standard web traffic (HTTP), and the other for secure web traffic (HTTPS). They don’t correspond to the Echo Protocol, so they aren’t the default port for the Echo service.