CompTIA A+

CompTIA A+ Port Numbers: 20 Essential Ports to Memorize Before the Exam

Here is a list of essential CompTIA A+ port numbers and their corresponding protocol names to review for your certification exam. These port numbers are crucial not only for passing your exam but also for your professional responsibilities.

Understanding port numbers is vital for effective network management and security. It enables administrators to establish precise firewall rules, manage routing, and comprehend network traffic, which is essential for effective monitoring and troubleshooting. By recognizing which ports are associated with specific services, administrators can identify unusual activities—such as unexpected traffic on certain ports—which could signal potential security threats. For instance, being aware that port 3389 is used for Remote Desktop Protocol (RDP) assists in monitoring for unauthorized access attempts, thereby enhancing network security. Ultimately, knowledge of port numbers allows for a more focused strategy in securing and optimizing the network infrastructure.

Important CompTIA A+ Port Numbers

comptia a+ port numbers

The table below lists the ports associated with some of the more commonly used protocols. It is important to familiarize yourself with each of these for the A+ exam.

Port Number TCP or UDP Protocol Name
20 TCP FTP (File Transfer Protocol)
21 TCP File Transfer Protocol (FTP) Command Control
22 TCP SSH (Secure Shell)
23 TCP Telnet
25 TCP SMTP (Simple Mail Transfer Protocol)
53 TCP/UDP DNS (Domain Name System)
67 UDP DHCP (Dynamic Host Configuration Protocol)
68 UDP DHCP (Dynamic Host Configuration Protocol)
69 UDP TFTP (Trivial File Transfer Protocol)
80 TCP HTTP (Hypertext Transfer Protocol)
110 TCP POP3 (Post Office Protocol version 3)
137 TCP NetBIOS/NetBT (Network Basic Input/Output System/NetBIOS over TCP/IP)
139 TCP NetBIOS/NetBT (Network Basic Input/Output System/NetBIOS over TCP/IP)
143 TCP IMAP4 (Internet Message Access Protocol version 4)
161 UDP SNMP (Simple Network Management Protocol)
162 UDP SNMP (Simple Network Management Protocol)
389 TCP LDAP (Lightweight Directory Access Protocol)
443 TCP HTTPS (Hypertext Transfer Protocol Secure)
445 TCP SMB/CIFS (Server Message Block/Common Internet File System)
3389 TCP RDP (Remote Desktop Protocol)

For the CompTIA A+ exam, the port numbers I listed previously are the main ones typically covered. However, it’s a good idea to be familiar with a few additional ports that are commonly encountered in IT environments:

Port Number TCP or UDP Protocol Name
123 UDP NTP (Network Time Protocol)
1433 TCP MS SQL Server
993 TCP IMAPS (IMAP Secure)
995 TCP POP3S (POP3 Secure)
119 TCP NNTP (Network News Transfer Protocol)
989 TCP FTPS (FTP Secure, data)
990 TCP FTPS (FTP Secure, control)
5060 UDP SIP (Session Initiation Protocol)
1723 TCP PPTP (Point-to-Point Tunneling Protocol)

These ports might not be explicitly required for the CompTIA A+ certification, but knowing them can be beneficial as they are relevant to networking and security practices you may encounter. Always check the most recent CompTIA A+ exam objectives for any updates or changes to the topics covered.

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