2.1 Ports and Protocols

Question 1

What are the three categories of port numbers?

Answer 1

Well-Known (0-1023), Registered (1024-49151), Dynamic/Private (49152-65535).

Question 2

What is the purpose of inbound ports?

Answer 2

To listen for incoming connections (e.g., Web Server on Port 80).

Question 3

What is the purpose of outbound ports?

Answer 3

They open dynamically when a device initiates a connection.

Question 4

What port does FTP use for file transfers?

Answer 4

Port 20 (data) and Port 21 (control).

Question 5

What secure protocol replaces FTP?

Answer 5

SFTP (SSH File Transfer Protocol) on Port 22.

Question 6

What port does SMB (Windows file sharing) use?

Answer 6

Port 445.

Question 7

What protocol and port are used for remote desktop access?

Answer 7

RDP (Remote Desktop Protocol) on Port 3389.

Question 8

What protocol allows insecure remote access and should be avoided?

Answer 8

Telnet on Port 23.

Question 9

What protocol provides secure remote shell access?

Answer 9

SSH on Port 22.

Question 10

What port is used for sending emails via SMTP?

Answer 10

Port 25.

Question 11

What port does POP3 use to retrieve emails?

Answer 11

Port 110.

Question 12

What protocol allows email synchronization across multiple devices?

Answer 12

IMAP on Port 143.

Question 13

What is the difference between HTTP and HTTPS?

Answer 13

HTTP (Port 80) is unencrypted, while HTTPS (Port 443) is encrypted with SSL/TLS.

Question 14

What protocol and port resolve domain names to IP addresses?

Answer 14

DNS on Port 53.

Question 15

What ports does DHCP use to assign IP addresses?

Answer 15

Port 67 (server) and Port 68 (client).

Question 16

What protocol is used to monitor and manage network devices?

Answer 16

SNMP (Simple Network Management Protocol) on Ports 161 and 162.

Question 17

What port is used for LDAP (Lightweight Directory Access Protocol)?

Answer 17

Port 389.

Question 18

What port is used for secure LDAP (LDAPS)?

Answer 18

Port 636.

Question 19

What protocol provides secure authentication in a network?

Answer 19

Kerberos on Port 88.

Question 20

What is the purpose of a firewall in relation to ports?

Answer 20

To allow or block specific ports based on security needs.