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| Section | Objectives |
|---|---|
| Topic 1: Software Defined Access Network (SDAN) | - Subscriber and service management - Corteca platform - Altiplano Access Controller - Network topology and service health |
| Topic 2: Fixed network architectures and broadband access | - Fixed Wireless Access (FWA) - Broadband network architecture - Passive Optical Networks (PON) - Optical Distribution Network (ODN) - FTTH and FTTx technologies |
| Topic 3: Management interfaces and automation | - Telemetry and automation concepts - NETCONF - CLI fundamentals - YANG data models |
| Topic 4: Service delivery and operations | - Network monitoring and troubleshooting - High-Speed Internet (HSI) - Voice, Internet and IPTV services - Service provisioning |
| Topic 5: Nokia fixed access portfolio | - Optical Network Terminals (ONTs) - Home networking devices - FastMile FWA solutions - Lightspan FX and MF Optical Line Terminals |
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33. Frage
What is a typical function of the Network Termination card in a Nokia Lightspan access node?
Antwort: B
Begründung:
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.
34. Frage
Which of the following statements correctly distinguishes traffic shaping from traffic policing?
Antwort: A
Begründung:
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.
35. Frage
A YANG model specifies that a configuration leaf can contain an integer from 1 through 4094. What is the principal benefit of this restriction?
Antwort: D
Begründung:
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.
36. Frage
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?
Antwort: D
Begründung:
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.
37. Frage
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
Antwort: B
Begründung:
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.
38. Frage
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