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NEW QUESTION # 24
Which architectural principle is fundamental to Software-Defined Networking?
- A. Separating the control plane from the data-forwarding plane
- B. Removing programmability and APIs from network management
- C. Combining all hardware and software into one fixed proprietary component
- D. Requiring every forwarding device to make all policy decisions independently
Answer: A
Explanation:
A central principle of Software-Defined Networking is the separation of control logic from packet-forwarding functions. The data plane remains responsible for forwarding traffic, while logically centralized control software determines policies and programs network behavior through defined interfaces. Logically centralized does not necessarily mean that all controller functions run on one physical server; they may be distributed for scalability and resilience while presenting a coordinated control view. SDN emphasizes programmability, automation, abstraction, and the use of APIs. It does not require every forwarding device to independently make all high-level policy decisions. It also avoids tightly coupling every function into one fixed proprietary system. In fixed-access networks, these concepts help operators automate service delivery and manage different access devices through common models and controller applications.
NEW QUESTION # 25
A service provider combines two copper pairs to increase the available DSL rate for one subscriber. Which technology is being used?
- A. Vectoring
- B. Bonding
- C. Optical splitting
- D. Multicast replication
Answer: B
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 # 26
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
- A. It switches HSI traffic between service forwarders and network-facing interfaces.
- B. It converts optical signals into analog telephone signals.
- C. It performs DSL crosstalk cancellation on copper pairs.
- D. It assigns Wi-Fi channels to residential gateways.
Answer: A
Explanation:
The HSI VPLS on the integrated hub provides the Layer 2 switching context used to carry High-Speed Internet traffic between HSI forwarders and the network-facing side of the access node. Subscriber traffic arriving through an ONT is associated with an HSI forwarder on the relevant line termination resources. The forwarder connects that traffic to the HSI VPLS, which then switches it toward one or more NNIs leading to the aggregation network. The VPLS does not perform optical-to-analog voice conversion, Wi-Fi radio management, or DSL vectoring. Those functions belong to different service components or technologies. This logical service architecture allows subscriber-facing resources and network-facing interfaces to participate in a controlled Ethernet forwarding domain while supporting the required service separation and policies.
NEW QUESTION # 27
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
- A. Converting GPON optical signals into subscriber Ethernet signals
- B. Performing physical fiber splicing in the outside plant
- C. Assigning Wi-Fi channels independently on every home device
- D. Coordinating network-service lifecycle activities and virtualized resources
Answer: D
Explanation:
The NFV Orchestrator coordinates the lifecycle of network services composed of one or more virtualized network functions and helps coordinate the infrastructure resources required by those services. It can work with Virtual Network Functions Managers and Virtualized Infrastructure Managers during service instantiation, scaling, modification, and termination. The VNFM focuses on the lifecycle of VNF instances, while the VIM manages virtualized compute, storage, and networking resources. The NFV Orchestrator does not terminate GPON optical signals, manage individual home Wi-Fi radio channels as its primary function, or perform physical fiber installation. Its higher-level coordination role helps translate a network-service definition into the deployment and resource actions necessary to create and maintain that service within the virtualized environment.
NEW QUESTION # 28
What is the primary purpose of Zero-Touch Provisioning for a newly installed residential Wi-Fi gateway?
- A. To require a technician to configure every parameter locally
- B. To convert the gateway into a passive optical splitter
- C. To allow the gateway to obtain its required configuration automatically
- D. To prevent the gateway from contacting a management platform
Answer: C
Explanation:
Zero-Touch Provisioning allows a newly connected gateway or Wi-Fi device to discover the appropriate management environment and obtain its required configuration with minimal manual intervention. This reduces installation time, lowers the chance of configuration errors, and makes subscriber self-installation more practical. In a managed home-network solution, the device can be associated with the subscriber, receive service parameters, and become visible to the provider's management platform. Zero-Touch Provisioning does not mean that no configuration exists; it means the configuration is delivered automatically instead of being entered locally by a technician. It also does not prevent management communication or turn an active gateway into a passive device. Successful provisioning still depends on network connectivity, device identity, authorization, and compatible management procedures.
NEW QUESTION # 29
Which Altiplano intent is used to define the uplink interfaces that connect an OLT toward the aggregation network?
- A. Uplink-connection intent
- B. Multicast-report intent
- C. Wi-Fi-radio intent
- D. Subscriber-authentication intent
Answer: A
NEW QUESTION # 30
In intent-based networking, what does an operator primarily specify through an intent?
- A. The optical power measured at every point in the fiber
- B. Every electrical characteristic of each hardware component
- C. The desired network outcome or state
- D. A list of packets that must be forwarded individually
Answer: C
Explanation:
An intent describes the desired network outcome or target state rather than requiring the operator to manually enter every device-level command. The intent system maps the requested outcome to the configurations and resources needed on the relevant network elements. It can then compare the intended state with the observed operational state and take corrective action when supported. Intent types, profiles, and associated models provide the logic and parameters required for this translation. An intent does not normally specify the electrical construction of hardware or list every packet to be forwarded. Optical measurements may be used as operational inputs, but they are not the general definition of an intent. This abstraction improves consistency, supports automation, and reduces repetitive device-by-device configuration work.
NEW QUESTION # 31
What is the primary benefit of enabling IGMP snooping on a Layer 2 device carrying IPTV multicast traffic?
- A. It replaces the multicast routing function performed by upstream routers.
- B. It prevents all hosts from sending IGMP membership reports.
- C. It forwards multicast traffic only toward ports with interested receivers.
- D. It converts multicast packets into unicast packets at the video server.
Answer: C
Explanation:
IGMP snooping allows a Layer 2 device to examine IGMP messages exchanged between multicast receivers and the multicast router or querier. From these messages, the device learns which ports lead to hosts that have joined particular multicast groups. It can then forward each multicast stream only to the relevant ports instead of flooding it throughout the broadcast domain. This conserves access bandwidth and prevents subscribers from receiving unnecessary IPTV traffic. IGMP snooping does not replace multicast routing, which remains a Layer 3 function. It also does not prevent hosts from sending membership reports; those reports are essential for learning group membership. The feature is particularly valuable in fixed-access IPTV deployments where several high-bitrate channels may be transported across shared aggregation and subscriber-facing infrastructure.
NEW QUESTION # 32
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
- A. At the source once for every possible subscriber, including nonmembers
- B. On every access port regardless of multicast group membership
- C. Only at points where the delivery path branches toward interested receivers
- D. At every receiver before the multicast stream enters the 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 # 33
A YANG model specifies that a configuration leaf can contain an integer from 1 through 4094. What is the principal benefit of this restriction?
- A. It converts the integer into an Ethernet frame.
- B. It enables configuration values to be validated against the defined data model.
- C. It prevents the leaf from being accessed through NETCONF.
- D. It allows invalid values to be corrected automatically by the optical splitter.
Answer: B
Explanation:
YANG can define data types, ranges, patterns, mandatory nodes, default values, and relationships between configuration elements. A range restriction allows management software and network devices to verify that a submitted value falls within the permitted limits. For example, restricting a VLAN-related integer to an appropriate range prevents clearly invalid values from being accepted. This model-driven validation reduces configuration errors and makes automation more predictable. A passive optical splitter has no processing capability and cannot correct invalid configuration. The restriction also does not convert a value into an Ethernet frame or prevent NETCONF access. Instead, NETCONF can carry configuration data structured according to the YANG model, and the server can reject an <edit-config> request when the proposed data violates applicable schema constraints.
NEW QUESTION # 34
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?
- A. TR-069 communicates exclusively through an OLT serial console.
- B. TR-069 writes configuration directly to a passive splitter.
- C. TR-069 can configure only devices that are physically inside the central office.
- D. TR-069 requires an active management session with the device.
Answer: D
Explanation:
TR-069 enables remote management through communication between customer-premises equipment and an Auto Configuration Server. The device must be powered, operational, and able to establish or participate in a management session before configuration parameters, software information, diagnostics, or status data can be exchanged. An ACS cannot provision a device that is completely offline because no active communication path exists. TR-069 does not configure passive splitters, which contain no management processor or configurable service logic. The managed device can be located at the subscriber premises and does not need to be inside the central office. Communication is carried over the device's network connection rather than exclusively through an OLT serial console. Authentication and protected transport help secure management exchanges between the device and the ACS.
NEW QUESTION # 35
Which connection is normally used by a Fixed Wireless Access indoor gateway to reach the service provider's access network?
- A. A 4G or 5G radio connection
- B. An xDSL connection through a DSLAM
- C. A GPON connection through a passive splitter
- D. An Ethernet subtending connection between OLTs
Answer: A
Explanation:
A Fixed Wireless Access indoor gateway normally uses a 4G or 5G radio connection to reach the service provider's mobile or fixed-wireless access network. Inside the home, the gateway can provide Ethernet and Wi-Fi connectivity to subscriber devices. This separates the wide-area access technology from the in-home distribution technology: cellular radio connects the premises to the operator, while Wi-Fi connects local user devices. A DSLAM is associated with copper-based DSL access, and a passive optical splitter belongs to a PON deployment. A subtending interface connects access nodes rather than a subscriber gateway to a radio network. Depending on the deployment, the FWA gateway may also be remotely provisioned and monitored using an external management platform and standardized CPE-management mechanisms.
NEW QUESTION # 36
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
- A. User Network Interface
- B. Network-to-Network Interface
- C. Subtending interface
- D. Management loopback interface
Answer: A
Explanation:
A User Network Interface is the subscriber-facing interface through which an access node connects to customer-side equipment or services. Depending on the access technology, this relationship can involve ONTs, subscriber ports, or other access termination functions. A Network-to-Network Interface connects the access node toward another network device, typically the Ethernet aggregation or transport network. A subtending interface is used when one access node is connected through another access node, allowing the downstream node's traffic to reach the aggregation network through the upstream node. A loopback interface is a logical interface generally used for management, routing identification, or testing and is not a physical subscriber connection. Correctly distinguishing UNI, NNI, and subtending roles is essential when interpreting an access-node datapath.
NEW QUESTION # 37
Which transport protocol is commonly used to provide a secure connection for NETCONF sessions?
- A. ARP
- B. IGMP
- C. SSH
- D. SIP
Answer: C
Explanation:
NETCONF is commonly transported over Secure Shell, which provides encryption, integrity protection, and peer authentication for the management session. After establishing the secure transport connection, the client and server exchange NETCONF capabilities and use RPC messages to retrieve or modify device data. IGMP manages IPv4 multicast group membership and does not provide a secure management transport. ARP resolves IPv4 addresses to Layer 2 hardware addresses within a local network. SIP establishes and manages communication sessions such as voice calls. Although NETCONF can conceptually operate over supported secure transports, NETCONF over SSH is the widely recognized deployment model. Secure transport is particularly important because NETCONF can expose operational information and perform configuration changes that materially affect access-network devices and subscriber services.
NEW QUESTION # 38
Which Corteca component is intended primarily for use by the subscriber during Wi-Fi installation and management?
- A. Corteca mobile application
- B. IPFIX collecting process
- C. OLT network termination card
- D. NETCONF candidate datastore
Answer: A
Explanation:
The Corteca mobile application provides subscriber-facing capabilities that can support self-installation and home Wi-Fi management. Depending on the enabled service, the subscriber can receive installation guidance, view the home network, manage connected devices, and perform supported troubleshooting or configuration tasks. The service provider uses other Corteca platform components for centralized service management, visibility, and operational control. An OLT network termination card provides access-node network connectivity and is not a subscriber application. An IPFIX collector receives traffic-flow records, while a NETCONF candidate datastore holds proposed device configuration before it is committed. Separating subscriber-facing and operator-facing functions allows the provider to offer controlled self-service capabilities without exposing the complete network-management environment or low-level access-device configuration to the end user.
NEW QUESTION # 39
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