CompTIA Network+ Port Numbers Study Guide
Mastering network port numbers is essential for passing the
CompTIA Network+ certification exam (N10-008 and
N10-009). This interactive ports quiz helps you memorize the most common
TCP and UDP ports that network administrators encounter daily.
Essential Network Ports for Network+ Exam
File Transfer Ports
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Port 20/21 - FTP (File Transfer Protocol): Port 20
handles data transfer while port 21 manages control commands. FTP is
used for transferring files between clients and servers.
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Port 22 - SSH (Secure Shell): Provides encrypted
remote login and secure file transfer via SFTP. Essential for secure
server administration.
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Port 23 - Telnet: Legacy protocol for remote login.
Transmits data in plaintext and should be avoided in favor of SSH.
Email Ports
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Port 25 - SMTP (Simple Mail Transfer Protocol):
Standard port for sending email between mail servers.
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Port 110 - POP3 (Post Office Protocol v3): Retrieves
email from a mail server and typically downloads messages locally.
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Port 143 - IMAP (Internet Message Access Protocol):
Retrieves email while keeping messages stored on the server for access
from multiple devices.
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Port 993 - IMAPS: Secure version of IMAP using
SSL/TLS encryption.
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Port 995 - POP3S: Secure version of POP3 using
SSL/TLS encryption.
Web Traffic Ports
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Port 80 - HTTP (Hypertext Transfer Protocol):
Standard port for unencrypted web traffic and browsing.
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Port 443 - HTTPS (HTTP Secure): Encrypted web traffic
using SSL/TLS. Required for secure websites and online transactions.
Network Infrastructure Ports
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Port 53 - DNS (Domain Name System): Resolves domain
names to IP addresses. Uses both TCP and UDP.
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Port 67/68 - DHCP (Dynamic Host Configuration Protocol): Automatically assigns IP addresses to network devices. Port 67 for
servers, port 68 for clients.
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Port 123 - NTP (Network Time Protocol): Synchronizes
clocks across network devices.
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Port 161/162 - SNMP (Simple Network Management Protocol): Monitors and manages network devices. Port 161 for queries, port
162 for traps.
Directory and Authentication Ports
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Port 389 - LDAP (Lightweight Directory Access Protocol): Accesses and manages directory services like Active Directory.
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Port 636 - LDAPS: Secure LDAP using SSL/TLS
encryption.
Remote Access and File Sharing Ports
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Port 137-139 - NetBIOS/NetBT: Network Basic
Input/Output System services for legacy Windows networking.
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Port 445 - SMB/CIFS (Server Message Block): Windows
file and printer sharing protocol.
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Port 3389 - RDP (Remote Desktop Protocol):
Microsoft's protocol for remote desktop connections to Windows
computers.
VoIP Ports
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Port 5060/5061 - SIP (Session Initiation Protocol):
Signaling protocol for VoIP calls. Port 5060 for unencrypted, port
5061 for encrypted.
Tips for Memorizing Network Ports
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Use mnemonics: Create memory aids like "SSH is 22,
Secure Shell for you"
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Group by function: Learn email ports together, web
ports together, etc.
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Practice regularly: Use this quiz daily until port
numbers become second nature
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Understand the protocol: Knowing what each service
does helps remember its port
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Focus on well-known ports: Ports 0-1023 are the most
commonly tested
About the CompTIA Network+ Certification
The CompTIA Network+ (N10-008/N10-009) is a
vendor-neutral certification that validates the essential knowledge and
skills needed to design, configure, manage, and troubleshoot wired and
wireless networks. Understanding port numbers is crucial for network
troubleshooting, firewall configuration, and security analysis.
This free Network+ ports quiz is part of Proftia's comprehensive
Network+ Study Guide
and exam preparation resources. Practice daily to build confidence for
your certification exam.