Common Ports

Question 1

Characteristics of ports:

Answer 1

• Ports allow a single host with a single IP address to run network services.
• Each port number identifies a distinct service
• Each host can have over 65,000 ports per IP address
• Port use is regulated by the Internet Corporation for Assigned Names and Numbers (ICANN)

Question 2

ICANN specifies the following three categories for ports:

Answer 2

• Well known ports
• Registered ports
• Dynamic ports

Question 3

Well known Ports

Answer 3

• Range from 0 - 1023

* Are assigned to common protocols and services

Question 4

Registered Ports

Answer 4

• Range from 1024 to 49151

* Are assigned by ICANN to specific service

Question 5

Dynamic Ports (private or high ports)

Answer 5

• Range from 49152 to 65535 and can be used by any service on an ad hoc basis
• Ports are assigned when a session is established and ports are released when the session ends

Question 6

20 TCP and UDP

21 TCP and UDP

Answer 6

• File Transfer Protocol (FTP)

Question 7

22 TCP and UDP

Answer 7

• Secure Shell (SSH)

Question 8

23 TCP

Answer 8

• Telnet

Question 9

25 TCP and UDP

Answer 9

• Simple Mail Transfer Protocol (SMTP)

Question 10

53 TCP and UDP

Answer 10

Domain Name Server (DNS)

Question 11

67 TCP and UDP

68 TCP and UDP

Answer 11

• Dynamic Host Configuration Protocol (DHCP)

Question 12

69 TCP and UDP

Answer 12

• Trivial File Transfer Protocol (TFTP)

Question 13

80 TCP and UDP

Answer 13

• Hypertext Transfer Protocol (HTTP)

Question 14

110 TCP

Answer 14

• Post Office Protocol (POP3)

Question 15

119 TCP

Answer 15

• Network News Transport Protocol (NNTP)

Question 16

123 TCP and UDP

Answer 16

• Network Time Protocol (NTP)

Question 17

137 TCP and UDP
138 TCP and UDP
139 TCP and UDP

Answer 17

NetBIOS Name Service
NetBIOS Datagram Service
NetBIOS Session Service

Question 18

143 TCP

Answer 18

Internet Message Access Protocol (IMAP4)

Question 19

161 UDP

162 TCP and UDP

Answer 19

• Simple Network Management Protocol (SNMP)

Question 20

389 TCP and UDP

Answer 20

• Lightweight Directory Access Protocol (LDAP)

Question 21

443 TCP and UDP

Answer 21

• HTTP over Secure Sockets Layer (HTTPS)

Question 22

445 TCP

Answer 22

• Microsoft Server Message Block (SMB) File Sharing

Question 23

1720 TCP

Answer 23

• H.323 Call Signaling

Question 24

2427 UDP

Answer 24

• Cisco Media Gateway Control Protocol (MGCP)

Question 25

3389 TCP and UDP

Answer 25

* Remote Desktop Protocol (RDP)

Question 26

5004 TCP and UDP | 5005 TCP and UDP

Answer 26

* Real-time Transport Protocol (RTP) Data | * Real-time Transport Protocol (RTP) Control

Question 27

5060 TCP and UDP | 5061 TCP

Answer 27

* Session Initiation Protocol (SIP) | * Session Initiation Protocol (SIP) over TLS

Question 28

What do u to protect a server

Answer 28

* Ensure that only the necessary ports are open. | * EX. If server is being used only for email, then shut down ports that correspond to FTP, DNS, HTTP, etc

Question 29

635 TCP and UDP

Answer 29

Lightweight Directory Access Protocol over TLS/SSL (LDAPS)