Network Ports

Question 1

What is port 68 used for?

Answer 1

DHCP (dynamic host configuration protocol) Client - UDP transport

Question 2

What is port 80 for?

Answer 2

HTTP (hyper text transfer protocol) - TCP transport

Question 3

What is port 25 for?

Answer 3

SMTP (simple mail transfer protocol) - TCP transport

Question 4

What is port 20 for?

Answer 4

FTP (file transfer protocol) data - TCP

Question 5

What is port 21 for?

Answer 5

FTP (file transfer protocol) control - TCP

Question 6

What is port 22 for?

Answer 6

SSH (secure shell) - TCP

Question 7

What is port 23 for?

Answer 7

Telnet - TCP

Question 8

What is port 53 for?

Answer 8

DNS (domain name service) - TCP, UDP

Question 9

What is port 67 for?

Answer 9

DHCP (dynamic host configuration protocol) server - TCP

Question 10

What is port 69 for?

Answer 10

TFTP (trivial file transfer protocol) - UDP

Question 11

What is port 110 for?

Answer 11

POP3 (post office protocol version 3) - TCP

Question 12

What is port 143 for?

Answer 12

IMAP (internet message access protocol) - TCP

Question 13

What is port 161 for?

Answer 13

SNMP (simple network management protocol) - UDP

Question 14

What is port 443 for?

Answer 14

HTTPS (hypertext transfer protocol secure) - TCP