CTA Broadband & Access Network Technologies

Question 1

What is the maximum downstream speed supported by VDSL2 Profile 17a?

Accepted Answer

100 Mbps

Answer

52 Mbps

Answer

250 Mbps

Answer

1 Gbps

Question 2

What does DOCSIS stand for?

Accepted Answer

Data Over Cable Service Interface Specification

Answer

Digital Optical Cable Service Interface Standard

Answer

Data Oriented Cable Signal Interface System

Answer

Digital Over-the-air Cable Service Integration Standard

Question 3

In DSL technology, what is referred to as the 'last mile'?

Accepted Answer

The connection between the central office and the customer premises

Answer

The final mile of fiber backbone between ISPs

Answer

The last segment of the internet backbone before a major hub

Answer

The final link between a Tier 1 and Tier 2 provider

Question 4

Which multiplexing technique separates upstream and downstream signals on an HFC cable network?

Accepted Answer

Frequency Division Multiplexing (FDM)

Answer

Time Division Multiplexing (TDM)

Answer

Wavelength Division Multiplexing (WDM)

Answer

Code Division Multiplexing (CDM)

Question 5

Which DOCSIS version introduced Full Duplex (FDX) operation, enabling symmetric multi-gigabit speeds?

Accepted Answer

DOCSIS 4.0

Answer

DOCSIS 2.0

Answer

DOCSIS 3.0

Answer

DOCSIS 3.1

Question 6

What technology allows multiple DSL lines to be aggregated together to increase total bandwidth?

Accepted Answer

DSL bonding (G.Bond / ITU G.998)

Answer

VLAN trunking (IEEE 802.1Q)

Answer

Spanning Tree link aggregation

Answer

Multilink PPP only

Question 7

What is the primary factor that limits ADSL performance compared to fiber optic broadband?

Accepted Answer

Signal attenuation increasing with loop distance from the CO

Answer

Higher latency due to modulation overhead

Answer

Incompatibility with IPv6 protocols

Answer

Higher installation cost per subscriber