Common Networking Ports

Question 1

What are the five encrypted ports you need to know for the Net+? What are their port numbers?

Answer 1

SFTP (Secure File Transfer Protocol) - tcp/22
SSH (Secure Shell) - tcp/22
HTTPS (Hypertext Transfer Protocol Secure) - tcp/443
LDAPS (Lightweight Directory Access Protocol Secure) - tcp/636
SMTPS (Simple Mail Transfer Protocol Secure) - tcp/587

Question 2

Which two ports handle majority of web browsing traffic? What is their port numbers?

Answer 2

HTTP (Hypertext Transfer Protocol) - tcp/80
HTTPS (Hypertext Transfer Protocol Secure) - tcp/443

Question 3

Which two ports are used primarily to query and modify directory services over a network? What is their port numbers?

Answer 3

LDAP (Lightweight Directory Access Protocol) - tcp/389
LDAPS (Lightweight Directory Access Protocol Secure) - tcp/636

Question 4

Which three protocols use UDP to handle network services like domain resolution, time synchronization, and logging? What are their port numbers?

Answer 4

DNS (Domain Name System) - udp/53 (small queries)
NTP (Network Time Protocol) - udp/123
Syslog - udp/514

Question 5

Which three protocols are used for email-related functions? What are their port numbers?

Answer 5

SMTP (Simple Mail Transfer Protocol) - tcp/25 (unencrypted), tcp/587 (encrypted)
IMAP (Internet Message Access Protocol) - tcp/143
SMTP (Encrypted) - tcp/587

Question 6

What are the two ports used for file transfer? Describe each.

Answer 6

FTP (File Transfer Protocol) - tcp/20 (data), tcp/21 (control): Standard, unencrypted file transfer.
TFTP (Trivial File Transfer Protocol) - udp/69: Simplified, UDP-based file transfer for small, quick transfers.

Question 7

What ports are commonly used for remote access? What protocols are associated with them?

Answer 7

SSH (Secure Shell) - tcp/22: Encrypted remote access for secure command-line access.
Telnet - tcp/23: Unencrypted, deprecated remote access (replaced by SSH).
RDP (Remote Desktop Protocol) - tcp/3389: Microsoft’s protocol for remote desktop control.

Question 8

Which protocols are used for network management and monitoring, and what are their port numbers?

Answer 8

SNMP (Simple Network Management Protocol) - udp/161
SNMP Trap - udp/162

Question 9

What ports and protocols are used for file and printer sharing on Windows networks?

Answer 9

SMB (Server Message Block) - tcp/445: Windows file and printer sharing protocol.

Question 10

Which two protocols are used for voice communication over IP and database management, and what are their port numbers?

Answer 10

SIP (Session Initiation Protocol) - tcp/5060 (unencrypted), tcp/5061 (encrypted): Used to initiate, maintain, and terminate VoIP sessions.
SQL (Structured Query Language) - tcp/1433: Used for communication with SQL database servers.

Question 11

Which protocols are UDP-based and commonly used for network services related to dynamic IP assignment, log management, and simple queries? What are their port numbers?

Answer 11

DHCP - udp/67 (server) and udp/68 (client): Dynamic IP addressing.
Syslog - udp/514: Logging network events.
DNS - udp/53 (small queries): Domain name resolution.

Question 12

What ports are associated with log management and remote file sharing on Windows networks?

Answer 12

Syslog - udp/514: Protocol for logging event messages across network devices.
SMB (Server Message Block) - tcp/445: Used for file and printer sharing on Windows networks.

Question 13

Which ports and protocols would you investigate if there’s an issue with time-sensitive applications like VoIP and logging network events?

Answer 13

SIP (Session Initiation Protocol) - tcp/5060 (unencrypted), tcp/5061 (encrypted): Manages VoIP sessions.
Syslog - udp/514: Used for logging network events.

Question 14

A network admin needs to monitor devices and securely access a remote server’s command line. Which protocols and ports will they likely use?

Answer 14

SNMP (Simple Network Management Protocol) - udp/161 (queries) and udp/162 (traps): Device monitoring.
SSH (Secure Shell) - tcp/22: Secure remote command-line access.

Question 15

Which protocols and ports are used for email-related functions, including sending, retrieving, and synchronizing emails across devices?

Answer 15

SMTP (Simple Mail Transfer Protocol) - tcp/25 (standard), tcp/587 (encrypted): Email sending.
IMAP (Internet Message Access Protocol) - tcp/143: Email retrieval and synchronization.

Question 16

If there’s an issue with user logins and group permissions not syncing properly across a network, which protocols and ports are likely involved?

Answer 16

LDAP - tcp/389: Standard directory services.
LDAPS - tcp/636: Secure directory services.

Question 17

Which ports and protocols are relevant for remote access, both secure and unsecure?

Answer 17

SSH (Secure Shell) - tcp/22: Secure remote access.
Telnet - tcp/23: Unencrypted remote access.
RDP (Remote Desktop Protocol) - tcp/3389: Secure remote desktop access.

Question 18

If a network administrator needs to monitor device performance and receive alerts about critical issues, which protocols and ports should they configure?

Answer 18

SNMP (Simple Network Management Protocol) - udp/161 for device polling and udp/162 for SNMP traps: Used for device monitoring and receiving alerts.

Question 19

What protocols and ports would a system administrator enable if they need secure web access and secure file transfers across the network?

Answer 19

HTTPS (Hypertext Transfer Protocol Secure) - tcp/443: Provides secure web access.
SFTP (Secure File Transfer Protocol) - tcp/22: Encrypted file transfers over SSH.

Question 20

A network has unsecured access points but needs to secure remote shell access and remote desktop connections. Which ports and protocols will you implement to ensure secure access?

Answer 20

SSH (Secure Shell) - tcp/22: Provides encrypted command-line access remotely.
RDP (Remote Desktop Protocol) - tcp/3389: Secure remote desktop access for Windows.

Question 21

If an organization needs to support both encrypted and unencrypted email protocols, which ports and protocols should they configure?

Answer 21

SMTP - tcp/25 for unencrypted, tcp/587 for encrypted: Used to send emails.
IMAP (Internet Message Access Protocol) - tcp/143 for unencrypted, tcp/993 for encrypted: Used for retrieving and syncing emails across devices.