Ports

Question 1

What port is FTP?

Answer 1

Ports 21 and 22

Question 2

What port is https?

Answer 2

TCP443

Question 3

What port is DNS?

Answer 3

TCP53

Question 4

What port is tFTP?

Answer 4

UDP69

Question 5

What port is Kerberos?

Answer 5

TCP88

Question 6

What port is Telnet?

Answer 6

TCP23

Question 7

What port is POP3?

Answer 7

TCP110

Question 8

What port is Echo

Answer 8

Port 7

Question 9

Character Generator is used for testing and debugging–what port does it use?

Answer 9

Port 19

Question 10

Telnet (TErminaL NETwork) remotely administers network devices. It has since been deprecated–but what port does it run on

Answer 10

23

Question 11

Simple Mail Transfer Protocol is for sending of emails, what port does it use?

Answer 11

25

Question 12

TACACS is similar to RADIUS in the sense that it is used for remote authentication. What port does TACACS use?

Answer 12

Port 49

Question 13

DNS resolves host names to an IP address. (8.8.8.8 = www.google.com) – what port does it use?

Answer 13

Port 53

Question 14

Kerberos is a network authentication protocol that employs “Tickets” (Think PKI) – What port does Kerberos use

Answer 14

88

Question 15

POP3 is for receiving email from a server. Keep in mind that POP3 inboxes do NOT save the emails locally.
What port does POP3 use?

Answer 15

110

Question 16

NNTP transports Usenet articles. While not often used, it does use a port listed under Well-Known. Which port is that?

Answer 16

119

Question 17

RPC/epmap/dcom-scm is for locating DCOM ports. It is known shorter as just “RPC” or Microsoft End Point Mapper / DCE Endpoint Resolution. What port does it use?

Answer 17

135

Question 18

NetBIOS is used for name querying, sending data, and netbios connections. What port does it use?

Answer 18

137-139

Question 19

IMAP (Internet Message Access Protocol) is similar to POP3 in that it is used to retrieve email. The advantage is that you can save those emails locally. What port does it use to do this?

Answer 19

143

Question 20

SNMP (Simple Network Management Protocol) is used to remotely monitor devices (ex. mfmon) – what port does it use?

Answer 20

161

Question 21

LDAP (Lightweight Directory Access Protocol) maintains directories of users and other objects, and is a frequent threat vector on systems. What port does it use?

Answer 21

389

Question 22

HTTPS (Secure HTTP) will use either TLS or SSL (TLS is preferred due to vulnerabilities in SSL) – what port is used to do this?

Answer 22

443

Question 23

SMB (Server message block) provides shared access to files and other resources (Think file sharing) and uses which port?

Answer 23

445

Question 24

LDAP over TLS/SSL is more secure than regular LDAP, and uses a different port. Which port is this?

Answer 24

636

Question 25

What port is used to query ms-sql-s (Microsoft SQL Server)?

Answer 25

1433

Question 26

Layer 2 Tunneling Protocol, which is also used with IPsec creates a tunnel using which port?

Answer 26

1701

Question 27

Point-to-point tunneling Protocol is used for VPN and has built in security. Which port does this use?

Answer 27

1723

Question 28

RDP is the most frequently used remote control protocol (Keep in mind it will kick users out) and uses which port?

Answer 28

3389