Which type if port is used by HTTP for the control connection?
A.
Ephemeral
B.
Well-known
C.
Dynamic
D.
UDP
Explanation:
The well-know ports are the ports numbered 0-1023. HTTP uses port 80 by default.
Incorrect Answers:
A: Ephemeral ports are those port above 1023 (1024-65535) used by the clients as source ports when connecting to a server. These ports are dynamically assigned to the client, and 1D0-470
released by the client. Once released, these port may be used again by a different client.
C: A static port is a port that is always open or closed. A dynamic port is a port that opens when it is assigned to a client or service, and then closes when the service or client releases the port. Dynamic ports are used in environments such as firewalls and proxy servers to hide ports and services, for example to limit the findings of a port scanner.
D: HTTP uses the TCP protocol, not UDP. UDP/TCP are transport layer (layer 4) protocols, and not port numbers. However, the protocol is important when contacting a port.