Ports

Question 1

FTP control port

Answer 1

TCP 21

Question 2

SSH

Answer 2

TCP 22

Question 3

SCP (uses SSH)

Answer 3

TCP 22

Secure Copy

Question 4

SFTP (uses SSH)

Answer 4

TCP 22 (not to be confused with SSL)

Secure FTP

Question 5

Telnet

Answer 5

TCP 23

Question 6

SMTP

Answer 6

TCP 25

Simple Mail Transfer Protocol

SENDS mail to mail servers

Question 7

TACACS+

Answer 7

TCP 49

Question 8

DNS name queries

Answer 8

UDP 53

Question 9

DNS zone stransfers

Answer 9

TCP 53

Question 10

DHCP client

Answer 10

UDP 68

Question 11

DHCP server

Answer 11

UDP 67

Question 12

TFTP

Answer 12

UDP 69

Question 13

HTTP

Answer 13

TCP 80

Question 14

Kerberos

Answer 14

UDP 88

Question 15

POP3

Answer 15

TCP 110

Post Office Protocol

DOWNLOADS mail ON client

Question 16

SNMP

Answer 16

UDP 161

Simple Network Management Protocol

Question 17

SNMP trap

Answer 17

UDP 162

Monitors + manages network devices (e.g. routers & switches), can be used to modify config.

traps - notifications w/info sent to a SNMP manager by SNMP agents

Question 18

NetBIOS

Answer 18

TCP/UDP 137 (rarely used)
UDP 138
TCP 139

Name resolution for NetBIOS names on internal networks

Question 19

IMAP4

Answer 19

TCP 143

Stores e-mail on mail server
Can be synced across multiple devices

Question 20

LDAP

Answer 20

TCP 389

Lightweight Access Directory Protocol

For communication with directories (like Windows AD)

Can be encryped with TLS or SSL, uses port 636 when encrypted

Question 21

HTTPS

Answer 21

TCP 443

Question 22

SMTP SSL/TLS

Answer 22

TCP 465

Question 23

IPsec (for VPN with Internet Key Exchange (IKE))

Answer 23

UDP 500

Question 24

LDAP/SSL

Answer 24

TCP 636

Question 25

LDAP/TLS

Answer 25

TCP 636

Question 26

IMAP SSL/TLS

Answer 26

TCP 993

Question 27

POP SSL/TLS

Answer 27

TCP 995

Question 28

L2TP

Answer 28

UDP 1701

Layer 2 Tunneling Protocol

Used for VPN tunnels

Normal L2TP has no encryption, but can be used with IPsec

Question 29

PPTP

Answer 29

TCP 1723

Point-to-Point Tunneling Protocol

Tunneling for VPNs, rarely used due to known vulnerabilities

Question 30

Remote Desktop Protocol (RDP)

Answer 30

TCP/UDP 3389

Question 31

Microsoft SQL Server

Answer 31

TCP 1433

Question 32

FTP data port (active mode)

Answer 32

TCP 20