Common ports and protocols

Question 1

80 / 443
tcp/udp
explain port

Answer 1

HTTP/HTTPS portnumber
TCP
website ports

Question 2

53
tcp/udp
explain port

Answer 2

DNS portnumber
TCP and UDP
Way to resolve IP addresses to names

Question 3

67, 68
tcp/udp
explain port

Answer 3

DHCP portnumber
UDP
Dynamic Host Configuration Protocol -> associates you with an IP address

Question 4

139 / 445
tcp/udp
explain port

Answer 4

SMB portnumber
TCP
Most common in pen testing, related to file shares (AKA SAMBA)

Question 5

21
tcp/udp
explain port

Answer 5

FTP portnumber
TCP
File Transfer Protocol
-> We can log into the server, put a file on or get a file off the server

Question 6

22
tcp/udp
explain port

Answer 6

SSH portnumber
TCP
Secure SHell -> Ability to log into a machine remotely, encrypted (=Telnet)

Question 7

143
tcp/udp
explain port

Answer 7

IMAP portnumber
TCP
related to mail

Question 8

23
tcp/udp
explain port

Answer 8

Telnet portnumber
TCP
Ability to log into a machine remotely, plain text (=ssh)

Question 9

110
tcp/udp
explain port

Answer 9

POP3 portnumber
TCP
related to mail

Question 10

25
tcp/udp
explain port

Answer 10

SMTP portnumber
TCP
related to mail

Question 11

69
tcp/udp
explain port

Answer 11

TFTP portnumber
UDP
Trivial FTP -> uses UDP instead of FTP

Question 12

161
tcp/udp
explain port

Answer 12

SNMP portnumber
UDP
Simple Network Management Protocol