Professor Messer’s CompTIA 220-1201 A+ Course Notes - Common Ports and Wireless Technologies

Vocabulary flashcards covering common network ports, protocols, and wireless technologies based on the CompTIA 220-1201 A+ course notes.

FTP (File Transfer Protocol)

Transfers files between systems using tcp/20 for active mode data and tcp/21 for control; authenticates with username and password.

SSH (Secure Shell)

An encrypted communication link acting similarly to Telnet, operating over tcp/22.

Telnet (Telecommunication Network)

A protocol for remote console access to devices over tcp/23; uses in-the-clear communication, which is not ideal for production systems.

SMTP (Simple Mail Transfer Protocol)

Used for server-to-server email transfer and sending mail from devices to servers over tcp/25.

DNS (Domain Name System)

Critical resources that convert names to IP addresses over udp/53.

DHCP (Dynamic Host Configuration Protocol)

Automated configuration of IP addresses and subnet masks using udp/67 and udp/68; requires a server or integrated router.

DHCP reservation

A method to assign IP addresses by MAC address in the DHCP server to manage them from a single location.

HTTP (Hypertext Transfer Protocol)

Protocol for communication in browsers and other applications; can be in the clear or encrypted.

POP3 (Post Office Protocol version 3)

Basic mail transfer functionality used to receive emails from a server over tcp/110.

IMAP4 (Internet Message Access Protocol v4)

Includes email inbox management from multiple clients when receiving email over tcp/143.

SMB (Server Message Block)

Protocol used by Microsoft Windows for file and printer sharing, also known as CIFS (Common Internet File System).

NetBIOS over TCP/IP Ports

Includes udp/137 for name services (nbname), tcp/139 for session service (nbsession), and tcp/445 for direct NetBIOS-less communication.

LDAP (Lightweight Directory Access Protocol)

Protocol operating on tcp/389 used to store and retrieve information in network directories like Microsoft Active Directory.

RDP (Remote Desktop Protocol)

Allows sharing a desktop or application from a remote location over tcp/3389.

IEEE Wireless Standards

Set by the Institute of Electrical and Electronics Engineers 802.11 committee, often referenced by generations such as Wi-Fi 5, 6, and 7.

802.11ac / 802.11ax / 802.11be

The standards corresponding to Wi-Fi 5, Wi-Fi 6/6E (extended), and Wi-Fi 7 respectively.

Bluetooth

Short-range wireless technology (approx. 10 meters) using the 2.4 GHz unlicensed ISM (Industrial, Scientific and Medical) band.

RFID (Radio-frequency identification)

Technology using radio energy transmitted to a tag to power it and transmit an ID back; used for access badges and tracking.

NFC (Near field communication)

Two-way wireless communication building on RFID; used for payment systems, access tokens, and Bluetooth pairing bootstrap.