SY0-701 Security+ Ports and Protocols

Vocabulary flashcards covering the essential ports and protocols required for the CompTIA Security+ SY0-701 exam.

File Transfer Protocol (FTP 20/21)

Unencrypted protocol for file transfer; port 21 handles control, port 20 handles data.

Secure Shell (SSH 22)

Encrypted remote-administration protocol that provides a secure channel over an unsecured network.

SSH File Transfer Protocol (SFTP 22)

File-transfer protocol that runs inside SSH; not interoperable with standard FTP servers, provides end-to-end encryption.

Simple Mail Transfer Protocol (SMTP 25)

Standard protocol used by mail clients to send outgoing email to mail servers.

TACACS+ (49)

Cisco-proprietary AAA protocol supplying authentication, authorization and accounting for network devices.

Domain Name System (DNS 53)

Resolves human-readable host names to IP addresses and vice-versa; typically uses UDP.

Dynamic Host Configuration Protocol (DHCP 67/68)

Automatically assigns IP addresses and other network parameters to hosts on a network.

Hypertext Transfer Protocol (HTTP 80)

Foundation of clear-text World Wide Web communication for browsers and web servers.

Kerberos (88)

Ticket-based network authentication protocol allowing secure identity verification over non-secure networks.

Post Office Protocol v3 (POP3 110)

Legacy email retrieval protocol supporting one-way download of messages from server to client.

Network Time Protocol (NTP 123)

Low-latency protocol that synchronizes clocks of computer systems over packet-switched, variable-latency data networks.

Server Message Block (SMB 139)

NetBIOS-based Microsoft file-sharing protocol originally using UDP/139 for remote file and printer access.

Internet Message Access Protocol (IMAP 143)

Two-way email retrieval protocol that lets clients manage messages directly on the server.

Simple Network Management Protocol (SNMP 161/162)

Monitors and manages network devices; 161 for queries, 162 for traps/alerts.

Lightweight Directory Access Protocol (LDAP 389)

Directory services protocol used to query and modify items in Active Directory or other directory stores.

Hypertext Transfer Protocol Secure (HTTPS 443)

HTTP carried inside TLS, providing encrypted web communication.

Secure Socket Tunneling Protocol (SSTP 443)

Microsoft VPN tunneling protocol that encapsulates PPP traffic in TLS over TCP/443.

Server Message Block (SMB 445)

Modern TCP-based version of SMB used for Windows file and printer sharing without NetBIOS.

IPSec with ISAKMP (500)

Key management and security association establishment for IPSec VPNs over UDP/500.

Simple Mail Transfer Protocol Secure (SMTPS 587)

SMTP wrapped in TLS to secure the submission of outgoing email from clients.

Lightweight Directory Access Protocol Secure (LDAPS 636)

LDAP operations protected by TLS for secure directory queries and updates.

File Transfer Protocol Secure (FTPS 989/990)

FTP enhanced with TLS encryption; commonly uses TCP/989 for data and TCP/990 for control.

Internet Message Access Protocol Secure (IMAPS 993)

IMAP encrypted with TLS, securing email retrieval and management.

Post Office Protocol 3 Secure (POP3S 995)

POP3 protected by TLS, ensuring encrypted mail download.

Remote Authentication Dial-In User Service (RADIUS 1812/1813)

Open AAA protocol; 1812 for authentication/authorization, 1813 for accounting.

Remote Desktop Protocol (RDP 3389)

Microsoft protocol enabling graphical remote control of Windows systems.

Diameter (3868)

Next-generation AAA protocol designed to replace RADIUS, using TCP for reliability and scalability.

Secure Real-Time Transport Protocol (SRTP 5004)

Encryption, message authentication and integrity for real-time audio/video streams over UDP.

Transmission Control Protocol (TCP)

Connection-oriented Layer-4 protocol providing reliable, ordered, error-checked delivery of data between applications.

User Datagram Protocol (UDP)

Connectionless Layer-4 protocol offering best-effort, low-latency delivery without reliability guarantees.

Point-to-Point Tunneling Protocol (PPTP 1723)

Deprecated VPN tunneling protocol based on PPP; provides minimal security.

Layer 2 Tunneling Protocol (L2TP 1701)

UDP-based tunneling protocol that encapsulates PPP frames; typically paired with IPSec for encryption.