ISC2 CC Network Security Practice Question
Which three ports are commonly used by secure protocols? (Choose THREE.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
443 (HTTPS)
HTTPS uses 443, SSH uses 22, and LDAPS uses 636. HTTP (80), Telnet (23), and FTP (21) are insecure or unencrypted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
80 (HTTP)
Why it's wrong here
HTTP is unencrypted.
- ✓
443 (HTTPS)
Why this is correct
Correct. HTTPS is HTTP over SSL/TLS.
- ✓
22 (SSH)
Why this is correct
Correct. SSH is a secure replacement for Telnet.
- ✗
23 (Telnet)
Why it's wrong here
Telnet is cleartext and insecure.
- ✓
636 (LDAPS)
Why this is correct
Correct. LDAPS is LDAP over SSL.
Go deeper
Related to this question
Learn chapter
Secure Network Architecture and Design
Key term
Telnet
Telnet is a network protocol that provides a bidirectional, interactive text-based communication session between two machines over a network, typically used for remote access and management of network devices.
Key term
LDAPS
LDAPS encrypts LDAP traffic using SSL/TLS to secure directory queries and authentication over a network.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.