350-501 Architecture Practice Question
Which TWO statements accurately describe the differences between GPON and XGS-PON? (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
✓
XGS-PON uses passive optical splitters.
XGS-PON provides symmetric 10 Gbps, while GPON is asymmetric (2.5G/1.25G). Both use passive optical splitters and WDM.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
XGS-PON uses passive optical splitters.
Why this is correct
Both GPON and XGS-PON are passive optical networks.
- ✗
GPON offers higher downstream bandwidth than XGS-PON.
Why it's wrong here
GPON downstream is 2.5 Gbps, less than XGS-PON.
- ✗
GPON requires active amplification in the field.
Why it's wrong here
GPON is passive.
- ✓
XGS-PON supports symmetric 10 Gbps speeds.
Why this is correct
XGS-PON is symmetric 10G.
- ✗
GPON uses WDM while XGS-PON does not.
Why it's wrong here
Both use WDM.
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
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