common network ports

Question 1

FTP

Answer 1

File Transfer Protocol
TCP Port 20/21
Port 20 -
sends and receives files between systems

Question 2

SSH

Answer 2

Secure Shell
TCP Port 22
Encrypted console access

Question 3

Telnet

Answer 3

Telecommunication Network
TCP Port 23
log in to devices remotely, console access

Question 4

SMTP

Answer 4

Simple Mail Transfer Protocol
TCP Port 25
transfer email between mail servers, commonly configured on mobile devices and email clients

Question 5

DNS

Answer 5

Domain Name System
UDP port 53 TCP port 53
convert domain names to IP addresses

Question 6

DHCP

Answer 6

Dynamic Host Configured Protocol
UDP port 67/68
automate the IP address configuration process

Question 7

HTTP

Answer 7

Hypertext Transfer Protocol
TCP port 80
web server communication

Question 8

HTTPS

Answer 8

Hypertext Transfer Protocol Secure
TCP port 443
web server communication with encryption

Question 9

POP3

Answer 9

Post Office Protocol version 3
TCP port 110
basic mail transfer functionality

Question 10

IMAP4

Answer 10

Internet Message Access Protocol v4
TCP port 143
a newer email client protocol

Question 11

SMB

Answer 11

Server Message Block
TCP port 445
Windows file transfers and printer sharing also called CIFS (Common Internet File System)

Question 12

SNMP

Answer 12

Simple Network Management Protocol
gather statistics from network devices
queries: UDP port 161
traps: UDP port 162

Question 13

LDAP

Answer 13

Lightweight Directory Access Protocol
TCP port 389
Store and retrieve information in a network directory, commonly used in Microsoft Active Directory

Question 14

RDP

Answer 14

Remote Desktop Protocol
TCP port 3389
graphical display of remote devices, can connect to an entire desktop or just an app