Common Ports

Question 1

What Uses TCP/20 & TCP/21

Answer 1

FTP
File Transfer Protocol
(Transfers files between systems)

Question 2

What Uses Port tcp/22?

Answer 2

SSH
Secure Shell
- Encrypted Data

Question 3

What Uses Port tcp/23

Answer 3

Telnet
- Communication is non encrypted

Question 4

What uses Port tcp/25

Answer 4

SMTP
- Simple Mail Transfer Protocol
- Used to Send Mail from a device to a Mail Server

Mail Reception is IMAP and POP3

Question 5

What uses UPD/53?

Answer 5

DNS
Domain Name Server

Question 6

What uses UDP/67 and UDP/68

Answer 6

DHCP
Dynamic Host Configuration Protocol

Question 7

What uses port tcp/80?

Answer 7

HTTP

Question 8

What uses Port tcp/443?

Answer 8

HTTPS

Question 9

TCP/110

Answer 9

POP3
Post Office Protocol v.3
Receive Email

Question 10

What uses tcp/143?

Answer 10

IMAP4
-Internet Message Access Protocol
-Receive email
-Management of email inbox from multiple clients

Question 11

What uses
UDP/137
And
TCP/139
And
TCP/445

Answer 11

SMB - Server Message Block
- File Sharing in Windows
- Print Sharing
- Also called CIFS (Common Internet File System)

/137= NETBIOS name Services (find devices by name)
/139= NETBIOS session services
/445= NETBIOS-less (direct communication over TCP to devices)

Question 12

What uses udp/161 and udp/162?

Answer 12

SNMP
Simple Network Management Protocol
Queries - 161
Traps - 162

Question 13

What uses Port tcp/389

Answer 13

LDAP
- Lightweight Directory Access Protocol
- Store and Retrieve info in a network directory

Question 14

What uses tcp/3389?

Answer 14

RDP
Remote Desktop Protocol