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| Section | Objectives |
|---|---|
| Broadband Services | - Internet, IPTV and voice services - Lightspan service components |
| Access Network | - OLT functions - Multicast and QoS principles - Access network architecture |
| Fixed Networks Management | - Netconf/YANG and telemetry - Altiplano Software-Defined Access Network (SDAN) - NFV and SDN concepts |
| Introduction to Fixed Networks | - Broadband access fundamentals - FTTH, FTTx and FWA solutions |
| Home Network | - Home devices and connectivity - Wi-Fi fundamentals |
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NEW QUESTION # 27
Which of the following statements correctly distinguishes traffic shaping from traffic policing?
Answer: C
Explanation:
Traffic shaping regulates an outgoing traffic stream by buffering packets that temporarily exceed the configured rate and transmitting them later. This smooths bursts but can introduce additional latency because packets remain in a queue. Traffic policing checks traffic against configured rate limits without normally delaying nonconforming packets. Depending on the policy, packets exceeding the permitted profile can be dropped or marked with a lower priority. Both mechanisms are QoS tools and are independent of whether the physical access medium is fiber, copper, or wireless. They also do not control multicast membership or VLAN assignment. In a fixed-access network, shaping can help produce a smoother egress rate, while policing can enforce subscriber or service bandwidth limits at an ingress boundary.
NEW QUESTION # 28
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 # 29
In an IPFIX deployment, which component observes traffic and sends flow records to a receiving system?
Answer: D
Explanation:
An IPFIX exporting process observes traffic at an observation point, creates flow records, and sends those records to an IPFIX collecting process. Templates describe the fields contained in the exported records, allowing the collector to interpret information such as source and destination addresses, transport ports, protocol identifiers, counters, and timestamps. The collector can store and analyze these records for traffic visibility, capacity planning, troubleshooting, accounting, or security analysis. IPFIX does not permanently store all collected information on the exporting network device. A passive optical splitter cannot inspect or export traffic because it has no active processing functions. An 802.1X supplicant participates in access authentication, while a SIP registrar maintains information used to locate SIP users or endpoints.
NEW QUESTION # 30
What is the primary function of the cladding in an optical fiber?
Answer: D
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 # 31
A residential gateway ONT provides routed Internet access to devices in a subscriber's home. Which DHCP role does it normally perform on the home LAN?
Answer: D
Explanation:
A Layer 3 residential gateway normally operates as a DHCP server on the subscriber's home LAN. It assigns private IP addresses and other configuration information, such as the default gateway and DNS server addresses, to connected devices. On its network-facing WAN interface, the gateway may operate as a DHCP client to obtain service parameters from the operator's network. These two DHCP roles must not be confused. The gateway also commonly performs routing, Network Address Translation, firewall enforcement, and local Ethernet or Wi-Fi connectivity. The OLT transports and controls subscriber access traffic but does not normally allocate private LAN addresses directly to individual home devices. This architecture separates the operator-facing connection from the subscriber's private local network and allows multiple home devices to share the broadband service.
NEW QUESTION # 32
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