350-501 Architecture Practice Question
Which access technology uses wavelength division multiplexing to provide symmetric gigabit speeds in fiber-optic networks?
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
✓
XGS-PON
XGS-PON uses wavelength division multiplexing to support symmetric 10 Gbps speeds, while GPON is asymmetric and DSL/cable are copper-based.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cable
Why it's wrong here
Cable (DOCSIS) uses coaxial cable and is asymmetric.
- ✗
GPON
Why it's wrong here
GPON provides asymmetric speeds (e.g., 2.5 Gbps down, 1.25 Gbps up).
- ✗
DSL
Why it's wrong here
DSL is a copper-based technology with lower speeds.
- ✓
XGS-PON
Why this is correct
XGS-PON uses WDM to deliver symmetric 10 Gbps.
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco 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 350-501 exam.