Question

Write the name of the Well-Known Port used by TCP?

Answer 1

PORT	Service	Description	Transport Protocol
7	Echo	Port just echoes whatever is sent to it. This feature can be used in many attacks, such as Smurf/Fraggle.	TCP and UDP
9	Discard	Discard any datagram that is received.
20 /21	File Transfer Protocol (FTP)	Port used by FTP protocol to send data to a client.	TCP
23	Telnet	Port used by Telnet to remotely connect to a workstation or server(unsecured)	TCP
25	Simple Mail Transfer Protocol (SMTP)	Used to send E-Mail over the Internet	TCP
53	Domain Name System (DNS)	Port for DNS requests, network routing, and zone transfers	TCP
67	BOOTP	Bootstrap protocol	TCP
80	Hyper Text Transfer Protocol (HTTP)	Used for browsing web-pages on a browser	TCP
110	Post Office Protocol (POP3)	Port used to retrieve complete contents of a server mailbox	TCP