CompTIA Security+ (SY0-701) — Quick Drills: Ports & Protocols flashcards

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One-line drills on the well-known ports Security+ expects you to know cold, in both directions, plus the secure replacement for each cleartext protocol and where TCP versus UDP matters.

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Drills deck · part of CompTIA Security+ (SY0-701) · written against: Exam SY0-701 objectives; SY0-701 can still be sat in English until 11 June 2027, and SY0-801 launches on 17 November 2026 (as of October 2026). Updated 2026-10-10.

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Ports used by FTP?

20 (data) and 21 (control), TCP
Ports & Protocols › File Transfer
TCP port 21 belongs to which protocol?

FTP (control channel)
Ports & Protocols › File Transfer
What does TCP port 20 carry?

FTP data (active mode)
Ports & Protocols › File Transfer
Port for TFTP?

69 (UDP)
Ports & Protocols › File Transfer
UDP port 69 belongs to which protocol?

TFTP — no authentication at all
Ports & Protocols › File Transfer
Secure replacement for Telnet?

SSH (TCP 22)
Secure Protocols
Secure replacement for HTTP?

HTTPS (TCP 443)
Secure Protocols
Secure replacement for LDAP?

LDAPS (TCP 636) or StartTLS
Secure Protocols
Secure replacement for SNMPv1 and SNMPv2c?

SNMPv3 (authentication and encryption)
Secure Protocols
Secure replacements for FTP?

SFTP (over SSH) or FTPS (over TLS)
Secure Protocols

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

Written for SY0-701, which can still be sat in English until 11 June 2027; its successor, SY0-801, launches on 17 November 2026 (CompTIA's Security+ V7 and V8 pages, as of October 2026).
Checked against the CompTIA Security+ SY0-701 exam objectives (topic list only; no text copied).
Checked against the IANA Service Name and Transport Protocol Port Number Registry (public) for port assignments.
Checked against the defining RFCs for each port and transport (reference only): FTP (RFC 959) and FTP over TLS (RFC 4217), TFTP (RFC 1350), SSH (RFC 4253), Telnet (RFC 854), SMTP submission (RFC 6409) and STARTTLS (RFC 3207), POP3 (RFC 1939), IMAP (RFC 9051), implicit TLS for email (RFC 8314), DNS (RFC 1035, RFC 7766), DHCP (RFC 2131), NTP (RFC 5905), Kerberos (RFC 4120), LDAP (RFC 4511), RADIUS (RFC 2865, RFC 2866), TACACS+ (RFC 8907), NetBIOS (RFC 1002), SNMP (RFC 1157, RFC 1901, RFC 3411–3418), syslog over UDP (RFC 5426) and over TLS (RFC 5425), HTTP (RFC 9110) and HTTP/3 (RFC 9114), SIP (RFC 3261), SRTP (RFC 3711) and TCP (RFC 9293).
Checked against Microsoft Learn documentation for the default ports of Remote Desktop, SQL Server, RPC and SMB (reference only).

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