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NEW QUESTION # 14
In an IPFIX deployment, which component observes traffic and sends flow records to a receiving system?
- A. Passive optical splitter
- B. 802.1X supplicant
- C. Exporting process
- D. SIP registrar
Answer: C
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 # 15
Which component of a typical Optical Distribution Network requires no electrical power to perform its primary function?
- A. Passive optical splitter
- B. Optical network termination
- C. Residential gateway
- D. Optical line 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 # 16
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. Subscriber-authentication intent
- D. Wi-Fi-radio intent
Answer: A
NEW QUESTION # 17
Which Wi-Fi 7 capability allows a compatible device to use more than one frequency-band link as part of the same connection?
- A. VLAN stacking
- B. Multi-Link Operation
- C. DSL vectoring
- D. Dynamic Bandwidth Allocation
Answer: B
NEW QUESTION # 18
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. Subscriber-authentication intent
- D. Wi-Fi-radio intent
Answer: A
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 # 19
How does an ADSL connection support simultaneous traditional voice and broadband data over the same copper pair?
- A. It converts the voice service into an optical wavelength.
- B. It assigns voice and data to different frequency ranges.
- C. It transmits voice only when no data packets are present.
- D. It uses separate time slots controlled by a GPON OLT.
Answer: B
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 # 20
A network controller must modify configuration data stored on a NETCONF-capable access device. Which NETCONF operation is designed for this purpose?
- A. <kill-session>
- B. <close-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 # 21
What is the primary purpose of vectoring in a DSL access network?
- A. To divide optical power among multiple subscribers
- B. To combine two or more copper pairs into one logical connection
- C. To cancel far-end crosstalk among coordinated copper lines
- D. To replace frequency-division duplexing with wavelength-division multiplexing
Answer: C
Explanation:
DSL vectoring is primarily used to reduce or cancel far-end crosstalk between copper pairs operating within the same cable bundle. Crosstalk can significantly reduce the attainable data rate, particularly with high-frequency technologies such as VDSL2. A vectoring system measures interference among coordinated lines and generates compensating signals that counteract the crosstalk. This can improve connection stability and allow lines to operate closer to their theoretical performance. Vectoring is different from bonding. Bonding combines the capacity of multiple physical copper pairs to increase the aggregate subscriber bitrate. Vectoring also does not divide optical signals because that is the function of a splitter in a passive optical network. Its effectiveness generally depends on coordinating the relevant DSL lines through compatible access equipment.
NEW QUESTION # 22
Which Wi-Fi 7 capability allows a compatible device to use more than one frequency-band link as part of the same connection?
- A. VLAN stacking
- B. Multi-Link Operation
- C. DSL vectoring
- D. Dynamic Bandwidth Allocation
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 # 23
A QoS policy examines a packet's markings and assigns it to a forwarding class. Which QoS function is being performed?
- A. Shaping
- B. Classification
- C. Optical amplification
- D. Policing
Answer: B
Explanation:
Classification examines packet information and determines how the packet should be treated by the QoS system. The decision can use fields such as VLAN priority, Differentiated Services Code Point, protocol information, or interface context. After classification, the packet is assigned to an appropriate forwarding class and queue so that scheduling, congestion management, and other policies can provide the intended treatment. Shaping controls an outgoing rate by buffering excess traffic, while policing enforces a traffic profile by dropping or remarking nonconforming packets. Optical amplification increases optical signal power and is unrelated to packet classification. Effective classification is essential when a fixed-access network carries services with different requirements, such as voice, IPTV, management traffic, and best-effort Internet access.
NEW QUESTION # 24
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 # 25
What is a typical function of the Network Termination card in a Nokia Lightspan access node?
- A. It provides Wi-Fi connectivity directly to subscriber mobile devices.
- B. It operates as the passive splitter in the Optical Distribution Network.
- C. It provides external network-facing interfaces through faceplate connectors or optical cages.
- D. It terminates every analog telephone inside the subscriber's home.
Answer: C
Explanation:
The Network Termination card provides network-facing connectivity for a Lightspan access node. Its faceplate can contain connectors and optical cages used to connect the node to external aggregation, transport, management, synchronization, or other supported interfaces. The card participates in forwarding traffic between subscriber-facing line termination resources and the upstream network. It is an active component and must not be confused with a passive optical splitter in the outside plant. It also does not provide in-home Wi-Fi directly to subscriber devices; that function belongs to a residential gateway or Wi-Fi access point. Analog telephones are normally connected through voice-capable subscriber equipment, such as an ONT with appropriate telephone interfaces, rather than directly to the Lightspan NT card.
NEW QUESTION # 26
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. An Ethernet subtending connection between OLTs
- D. A GPON connection through a passive splitter
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 # 27
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
- A. It converts optical signals into analog telephone signals.
- B. It performs DSL crosstalk cancellation on copper pairs.
- C. It switches HSI traffic between service forwarders and network-facing interfaces.
- D. It assigns Wi-Fi channels to residential gateways.
Answer: C
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 # 28
In an 802.1X-based subscriber authentication design, which role does the residential gateway normally perform?
- A. Multicast querier
- B. Authentication server
- C. RADIUS database
- D. Supplicant
Answer: D
Explanation:
The residential gateway normally acts as the 802.1X supplicant. It supplies identity information and participates in the Extensible Authentication Protocol exchange required to obtain network access. The access device or OLT commonly performs the authenticator role, controlling the subscriber-facing port and relaying authentication information between the supplicant and the authentication server. The authentication server, frequently using RADIUS, validates the credentials and returns an authorization result or related policy attributes. The gateway is therefore not itself the RADIUS database or authentication server in this design. A multicast querier performs a separate function by sending IGMP queries to maintain multicast membership information. Before successful authentication, the authenticator generally restricts ordinary subscriber traffic while allowing the authentication exchange required to complete access control.
NEW QUESTION # 29
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 acts as a DHCP client for every device connected to the LAN.
- B. It acts as a DHCP server and assigns private IP addresses to home devices.
- C. It acts only as a DHCP relay and never maintains address information.
- D. It disables local addressing and assigns public addresses directly from the OLT.
Answer: B
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 # 30
Which transport protocol is commonly used to provide a secure connection for NETCONF sessions?
- A. SIP
- B. IGMP
- C. SSH
- D. ARP
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 # 31
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