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| Section | Objectives |
|---|---|
| Access Network | - Multicast and QoS principles - Access network architecture - OLT functions |
| Broadband Services | - Internet, IPTV and voice services - Lightspan service components |
| Home Network | - Wi-Fi fundamentals - Home devices and connectivity |
| Fixed Networks Management | - Altiplano Software-Defined Access Network (SDAN) - NFV and SDN concepts - Netconf/YANG and telemetry |
| Introduction to Fixed Networks | - Broadband access fundamentals - FTTH, FTTx and FWA solutions |
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NEW QUESTION # 28
A service provider combines two copper pairs to increase the available DSL rate for one subscriber. Which technology is being used?
Answer: C
Explanation:
DSL bonding combines two or more physical copper pairs into a single logical subscriber connection. Traffic is distributed across the available pairs, allowing the aggregate bitrate to increase, provided the individual lines have suitable quality and compatible performance. Bonding can also provide operational benefits where one pair alone cannot deliver the required service rate. It is different from vectoring, which reduces crosstalk among coordinated copper lines by generating compensating signals. Optical splitting divides optical power in a PON and does not combine copper capacity. Multicast replication creates copies of multicast packets for different receiver paths and is unrelated to DSL transmission capacity. Both ends of a bonded DSL connection must support the applicable bonding method and coordinate traffic across the paired lines.
NEW QUESTION # 29
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
Answer: C
Explanation:
Multicast is bandwidth-efficient because one stream can be transported across shared network sections and replicated only where paths diverge toward interested receivers. Routers and multicast-aware switching functions use membership and forwarding information to determine which interfaces require a copy. This approach avoids sending a separate end-to-end unicast stream for every viewer and avoids flooding the content to subscribers who did not join the group. IGMP reports communicate receiver membership on IPv4 access networks, while IGMP snooping helps Layer 2 devices restrict forwarding to appropriate ports. Replicating content for every possible subscriber at the source would remove much of multicast's scaling advantage. Likewise, transmitting every stream on every access port would waste bandwidth and could expose receivers to large amounts of unwanted traffic.
NEW QUESTION # 30
An optical link experiences unexpectedly high signal loss immediately after a fiber cable is routed around a very tight corner. What is the most likely cause?
Answer: C
Explanation:
Macrobending occurs when an optical fiber is bent with a radius smaller than its supported minimum bend radius. The excessive bend can cause part of the optical signal to escape from the core, increasing attenuation and reducing the received optical power. This problem can appear after poor cable installation, improper storage, or routing the cable sharply around structural objects. Chromatic dispersion causes different wavelengths or spectral components of an optical pulse to travel at slightly different speeds, but it is not normally triggered by one tight physical corner. DSL crosstalk applies to copper pairs, while Dynamic Bandwidth Allocation controls upstream transmission opportunities in a PON. Correcting the cable routing and respecting the specified bend radius can remove or reduce the loss.
NEW QUESTION # 31
What does hardware abstraction provide in a disaggregated access network?
Answer: D
Explanation:
Hardware abstraction separates higher-level control and management functions from many platform-specific implementation details. It can provide controllers and applications with consistent models or interfaces for operating different supported hardware platforms. This makes automation, service development, and multivendor management more practical because applications do not need to reproduce every low-level procedure for each device. Abstraction does not require all platforms to contain identical components, nor does it eliminate actual differences in capacity, features, or operational constraints. Those differences must still be represented where relevant. It also does not make active access equipment passive. In a disaggregated access architecture, software is divided into functional modules, and standardized or well-defined interfaces allow those modules to interact with abstracted device resources and with higher-level orchestration or assurance applications.
NEW QUESTION # 32
What is the primary function of the cladding in an optical fiber?
Answer: B
Explanation:
The cladding surrounds the optical fiber core and has a lower refractive index than the core. This difference causes light to remain confined within the core through total internal reflection, allowing the optical signal to travel along the fiber. The cladding does not generate or amplify light; transmitters and optical amplifiers perform those functions. It also does not divide an optical signal among subscribers, which is the role of a passive optical splitter in an Optical Distribution Network. Outside the cladding, protective coatings and buffers help protect the glass from moisture, bending, and mechanical damage. The core and cladding therefore perform essential optical functions, while the surrounding protective layers primarily provide physical protection.
NEW QUESTION # 33
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