200-901 Network Fundamentals Practice Question
Which TWO of the following are characteristics of TLS (Transport Layer Security) used in HTTPS? (Choose two.)
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
✓
It uses asymmetric encryption to exchange a symmetric session key.
TLS provides encryption and uses certificates for authentication. HTTP/2 is an application layer protocol, not a TLS feature. Port 443 is the default for HTTPS, but TLS itself does not define the port. TLS uses symmetric encryption for session keys.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It supports multiplexing of multiple streams.
Why it's wrong here
Multiplexing is a feature of HTTP/2, not TLS.
- ✓
It uses asymmetric encryption to exchange a symmetric session key.
Why this is correct
TLS uses asymmetric encryption (public key) to securely exchange a symmetric key for bulk encryption.
- ✗
It is an application layer protocol like HTTP.
Why it's wrong here
TLS is a transport layer security protocol that runs between transport and application layers.
- ✗
It uses port 443 by default.
Why it's wrong here
Port 443 is the default for HTTPS, not a TLS property.
- ✓
It provides server (and optionally client) certificate verification.
Why this is correct
TLS verifies server identity using certificates.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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