Ports

Question 1

Port 20

Answer 1

Used for FTP (file transfer protocol) data transfer

Question 2

Port 21

Answer 2

(FTP Control) used for FTP (file transfer protocol) control commands.
The control connection used TCP port 21 by default.

Question 3

Port 22 (SSH)

Answer 3

Is for Secure Shell (SSH) secure logins, file transfers (scp, sftp) and port forwarding.

Question 4

Port 23 Telnet

Answer 4

Telnet protocol for unencrypted text communications.

Question 5

Port 25 (SMTP)

Answer 5

Simple Mail Transfer Protocol (SMTP) for email routing between mail servers.

Question 6

Port 53 (DNS)

Answer 6

Domain Name System (DNS) for name resolution - port 53

Question 7

Port 80 (HTTP)

Answer 7

Hypertext Transfer Protocol (HTTP) for secure web traffic.

Question 8

Port 443 (HTTPS)

Answer 8

Hypertext Transfer Protocol Secure (HTTPS) for secure web traffic.

Question 9

Port 110 (POP3)

Answer 9

Post Office Protocol Version 3 (POP3) for email retrieval

Question 10

Port 143 (IMAP)

Answer 10

Internet Message Access Protocol (IMAP) for email management on a server.

Question 11

Port 161 (SNMP)

Answer 11

Simple Network Management Protocol (SNMP) for network management.

Question 12

Port 389 (LDAP)

Answer 12

Lightweight Directory Access Protocol (LDAP) for directory services.

Question 13

Port 993 (IMAPS)

Answer 13

Port number used for encrypted communication between an email client and email server.
IMAPS = IMAP over SSL for secure email retrieval.

Question 14

Port 995 (POP3S)

Answer 14

Encrypted port used to move email messages between email client and an email server and uses SSL/TLS encryption to secure the connection.
POP3 over SSL for secure email retrieval