ISC2 CC Network Security Practice Question
Which protocol is considered insecure because it transmits data in cleartext, including passwords?
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
✓
Telnet
Telnet (port 23) sends all data, including credentials, in plaintext.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SFTP
Why it's wrong here
SFTP uses SSH encryption.
- ✗
SSH
Why it's wrong here
SSH encrypts all traffic.
- ✗
HTTPS
Why it's wrong here
HTTPS encrypts HTTP traffic with TLS.
- ✓
Telnet
Why this is correct
Correct. Telnet uses cleartext transmission.
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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.