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NEW QUESTION # 22
What is the primary function of the cladding in an optical fiber?
- A. To divide one optical signal among multiple subscribers
- B. To keep light confined within the fiber core
- C. To amplify optical signals over long distances
- D. To convert electrical signals into optical signals
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 # 23
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?
- A. It disables local addressing and assigns public addresses directly from the OLT.
- B. It acts as a DHCP client for every device connected to the LAN.
- C. It acts as a DHCP server and assigns private IP addresses to home devices.
- D. It acts only as a DHCP relay and never maintains address information.
Answer: C
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 # 24
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 # 25
Which Altiplano intent is used to define the uplink interfaces that connect an OLT toward the aggregation network?
- A. Multicast-report intent
- B. Wi-Fi-radio intent
- C. Uplink-connection intent
- D. Subscriber-authentication intent
Answer: C
Explanation:
The uplink-connection intent defines how an OLT connects toward the aggregation or transport network. It is used to configure relevant uplink resources, which can include network-facing interfaces and associated parameters supported by the device and intent model. This intent is distinct from the broader device intent and device-configuration information used to identify and configure the particular access node and its assigned profiles. Subscriber authentication, Wi-Fi radio operation, and multicast membership reporting are separate functional areas and are not substitutes for the OLT uplink-connection intent. By representing uplink connectivity as an intent, Altiplano can translate the desired connection into lower-level device configuration and apply it consistently through model-driven management. The resulting configuration must still match the capabilities and physical resources available on the selected OLT.
NEW QUESTION # 26
How does an ADSL connection support simultaneous traditional voice and broadband data over the same copper pair?
- A. It assigns voice and data to different frequency ranges.
- B. It uses separate time slots controlled by a GPON OLT.
- C. It converts the voice service into an optical wavelength.
- D. It transmits voice only when no data packets are present.
Answer: A
Explanation:
ADSL uses frequency-division techniques to place traditional analog voice and broadband data in different portions of the available copper-pair spectrum. The lower-frequency range is reserved for voice, while higher-frequency ranges carry upstream and downstream DSL data. Filters or splitters separate these frequency ranges at the subscriber and network sides, allowing a telephone call and an Internet session to operate simultaneously. The services are not required to alternate in time, and an optical wavelength is not involved because ADSL operates over copper. GPON time-slot scheduling applies to upstream transmissions from ONTs on a passive optical network, not to ADSL voice separation. Line quality, loop length, attenuation, and interference affect the data rate that ADSL can achieve.
NEW QUESTION # 27
A network controller must modify configuration data stored on a NETCONF-capable access device. Which NETCONF operation is designed for this purpose?
- A. <close-session>
- B. <kill-session>
- C. <get-config>
- D. <edit-config>
Answer: D
Explanation:
The NETCONF <edit-config> operation is used to create, change, merge, replace, or delete configuration data in a target configuration datastore. The target can be a datastore such as running or candidate, depending on the capabilities supported by the network device. By comparison, <get-config> retrieves configuration data and does not modify it. <close-session> requests an orderly termination of the current NETCONF session, while <kill-session> forces the termination of another session identified by its session ID. NETCONF operations are carried within RPC messages and commonly transported over a secure protocol such as SSH. YANG models define the structure, types, constraints, and relationships of the configuration and operational data manipulated through NETCONF.
NEW QUESTION # 28
What is the primary benefit of enabling IGMP snooping on a Layer 2 device carrying IPTV multicast traffic?
- A. It prevents all hosts from sending IGMP membership reports.
- B. It converts multicast packets into unicast packets at the video server.
- C. It replaces the multicast routing function performed by upstream routers.
- D. It forwards multicast traffic only toward ports with interested receivers.
Answer: D
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 # 29
A service provider combines two copper pairs to increase the available DSL rate for one subscriber. Which technology is being used?
- A. Vectoring
- B. Optical splitting
- C. Multicast replication
- D. Bonding
Answer: D
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 # 30
Which Wi-Fi 7 capability allows a compatible device to use more than one frequency-band link as part of the same connection?
- A. Dynamic Bandwidth Allocation
- B. Multi-Link Operation
- C. VLAN stacking
- D. DSL vectoring
Answer: B
Explanation:
Multi-Link Operation is a major Wi-Fi 7 capability that enables compatible devices to establish and coordinate multiple radio links, potentially across frequency bands such as 5 GHz and 6 GHz. Depending on the implementation, traffic can be distributed across links to increase throughput or moved between links to reduce latency and avoid interference. Earlier Wi-Fi generations generally treated a client's band connection more independently. Dynamic Bandwidth Allocation schedules upstream PON capacity, DSL vectoring mitigates copper-pair crosstalk, and VLAN stacking carries multiple VLAN identifiers in Ethernet frames. Multi-Link Operation requires support from both the access point and client. Actual performance also depends on spectrum availability, channel conditions, device capabilities, regulatory constraints, and the capacity of the access point's wired or wireless backhaul.
NEW QUESTION # 31
Which architectural principle is fundamental to Software-Defined Networking?
- A. Separating the control plane from the data-forwarding plane
- B. Requiring every forwarding device to make all policy decisions independently
- C. Combining all hardware and software into one fixed proprietary component
- D. Removing programmability and APIs from network management
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 # 32
Why does an access automation platform store operational state, logs, and telemetry in a common data lake?
- A. To convert unicast subscriber traffic into multicast traffic
- B. To support centralized analysis, monitoring, and automation
- C. To prevent applications from accessing historical information
- D. To replace every physical access device with stored records
Answer: B
Explanation:
A common data lake provides a centralized location for operational state, telemetry, logs, alarms, and other information collected from access-network devices and applications. Centralized data enables monitoring tools to correlate information across multiple nodes, evaluate network health, identify trends, and support analytics-driven automation. Historical data can also assist with troubleshooting, performance baselining, capacity planning, and detection of abnormal behavior. The data lake does not replace physical access devices; it stores information describing their operation. It is intended to make relevant information available to authorized applications rather than prevent historical access. It also does not automatically transform subscriber unicast traffic into multicast. Forwarding behavior is controlled through service and network configuration, whereas the data lake supports visibility, analysis, and operational decision-making.
NEW QUESTION # 33
Which component of a typical Optical Distribution Network requires no electrical power to perform its primary function?
- A. Passive optical splitter
- B. Residential gateway
- C. Optical line termination
- D. Optical network termination
Answer: A
Explanation:
A passive optical splitter divides an incoming optical signal into multiple output paths without requiring electrical power. It is a fundamental component of the Optical Distribution Network connecting an OLT to multiple ONTs or ONUs. The splitter does not regenerate, amplify, or actively switch the optical signal. Consequently, splitting introduces optical loss that must be considered when calculating the PON power budget. The OLT and ONT are active devices because they require power to transmit, receive, process, and convert signals. A residential gateway also requires power to provide functions such as routing, firewall enforcement, DHCP, Ethernet switching, and Wi-Fi connectivity. The use of passive splitters reduces the need for powered equipment in the outside plant, which can simplify field maintenance and lower operational costs.
NEW QUESTION # 34
What is the primary function of the cladding in an optical fiber?
- A. To divide one optical signal among multiple subscribers
- B. To keep light confined within the fiber core
- C. To amplify optical signals over long distances
- D. To convert electrical signals into optical signals
Answer: B
NEW QUESTION # 35
In a voice service delivered through an ONT, which component commonly provides signaling toward the operator's SIP infrastructure?
- A. IGMP snooping process
- B. Wi-Fi mesh satellite
- C. Passive optical splitter
- D. SIP agent on the ONT
Answer: D
Explanation:
A voice-capable ONT commonly contains a SIP agent that handles signaling toward the operator's SIP registrar and proxy infrastructure. An analog telephone can connect to a telephone interface on the ONT, which converts between the analog user interface and the packet-based voice service. Within the access node, voice traffic can be carried through a voice forwarder and an appropriate VPLS toward the aggregation network. A passive optical splitter merely divides optical power and cannot originate or terminate SIP signaling. A Wi-Fi mesh satellite extends wireless coverage, while IGMP snooping manages Layer 2 forwarding for multicast groups. SIP signaling establishes and manages communication sessions, whereas the actual media stream is commonly carried separately using a real-time transport protocol once the call has been established.
NEW QUESTION # 36
Which Wi-Fi 7 capability allows a compatible device to use more than one frequency-band link as part of the same connection?
- A. Dynamic Bandwidth Allocation
- B. Multi-Link Operation
- C. VLAN stacking
- D. DSL vectoring
Answer: B
NEW QUESTION # 37
A provider wants to separate every subscriber's traffic throughout the access network, even when subscribers use the same service. Which VLAN model best meets this requirement?
- A. VLAN per subscriber
- B. One untagged VLAN for the entire access network
- C. One VLAN for every multicast channel
- D. VLAN per service
Answer: A
Explanation:
A VLAN-per-subscriber model assigns a distinct VLAN context to each subscriber, providing clear Layer 2 separation between subscribers even when they consume the same service. This can simplify subscriber identification and support individual policy or forwarding treatment, but it requires the network to accommodate a larger number of VLANs. In a VLAN-per-service model, multiple subscribers using the same service can share a service VLAN toward the aggregation network. The access node must then preserve subscriber isolation through other forwarding controls and map traffic correctly between subscriber-facing and network-facing interfaces. Using one untagged VLAN for the entire access network provides insufficient segmentation. Assigning a VLAN to each multicast channel categorizes content rather than uniquely separating individual subscribers and therefore does not meet the stated requirement.
NEW QUESTION # 38
Which Altiplano intent is used to define the uplink interfaces that connect an OLT toward the aggregation network?
- A. Multicast-report intent
- B. Wi-Fi-radio intent
- C. Uplink-connection intent
- D. Subscriber-authentication intent
Answer: C
NEW QUESTION # 39
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