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| Section | Objectives |
|---|---|
| Topic 1: Switching and Routing in Campus Networks | - Layer 2 and Layer 3 design principles - VLAN and segmentation design |
| Topic 2: Huawei Campus Network Solutions | - CloudCampus solution architecture - iMaster NCE-Campus management platform |
| Topic 3: Network Security Design | - Access control strategies - Campus security architecture considerations |
| Topic 4: Presales Solution Design | - Customer requirement analysis - Solution proposal and design methodology |
| Topic 5: Campus Network Fundamentals | - Typical campus network deployment models - Enterprise campus network architecture principles |
| Topic 6: WLAN Planning and Design | - Capacity and performance design considerations - Wireless coverage planning |
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17. Frage
Which of the following are Target Wake Time (TWT) technologies?
Antwort: A,B,D
Begründung:
Broadcast TWT, Individual TWT, and Implicit TWT are valid Target Wake Time concepts. Individual TWT establishes a wake schedule between an AP and a specific station. Broadcast TWT advertises scheduling information that multiple stations can use, reducing individual negotiation overhead and coordinating groups of devices. An implicit TWT agreement defines a repeating schedule in which subsequent wake times are calculated from the agreed wake interval instead of being renegotiated for every service period.
These mechanisms allow stations, particularly battery-powered IoT devices, to sleep for predictable periods and wake only when transmission or reception is scheduled. TWT consequently reduces power consumption, channel contention, collisions, and unnecessary medium access in dense WLAN environments. Research describing IEEE 802.11ax TWT confirms that the mechanism schedules station transmission periods and allows stations to remain asleep outside their negotiated service periods.
"Multicast TWT" is not one of the standard TWT concepts represented by this question. Broadcast scheduling can cover multiple stations, but that does not create a separate mechanism formally identified here as Multicast TWT. Therefore, the correct answers are A, B, and C.
18. Frage
A label stack is an ordered set of labels. MPLS supports a maximum of three layers of nested labels.
Antwort: A
Begründung:
The statement is false. An MPLS label stack is an ordered sequence of label-stack entries, with the top label processed first and the bottom identified by the Bottom-of-Stack bit. However, the MPLS architecture does not define a universal maximum of three nested labels. An MPLS forwarding operation may replace the top label, remove it, or push one or more additional labels onto the stack.
Practical label depth is constrained by device implementation, forwarding ASIC capabilities, packet size, and the number of network functions being encoded. A conventional MPLS VPN may use two labels: a transport label and a VPN label. More advanced deployments can add labels for traffic engineering, segment routing, entropy, service chaining, or hierarchical transport. This can produce stacks deeper than three entries.
Therefore, "three layers" may describe a limitation of a particular platform, software version, or deployment design, but it is not an MPLS protocol maximum. RFC 3032 defines the stack as a sequence of four-byte entries and explicitly allows one or more entries to be pushed without specifying a three-label ceiling.
19. Frage
Which of the following can be determined through a survey of the terminal types on a customer's network?
Antwort: D
Begründung:
A terminal-type survey primarily determines the appropriate network admission control solution. Different terminal categories have different authentication capabilities and security requirements. Corporate laptops may support 802.1X authentication, guests may require Portal authentication, and printers, cameras, sensors, and other dumb terminals commonly require MAC-address authentication or automatic terminal identification.
Huawei recommends selecting authentication technologies according to the terminal type and usage scenario.
For example, access switches can serve as authentication points for wired dumb terminals, while APs or other access devices can perform authentication for wireless users. After terminal identification is enabled, iMaster NCE-Campus can automatically assign VLANs, ACLs, security groups, QoS parameters, and other authorization policies according to terminal category.
The survey therefore establishes which endpoints support interactive authentication, which require non- interactive admission, and which must receive special isolation or compliance policies. It does not independently determine the complete physical network architecture or the overall O & M platform.
Consequently, the terminal survey is used to formulate the network admission control solution, making option C correct.
20. Frage
In hierarchical networking, which of the following devices is used for communication between different areas?
Antwort: A
Begründung:
A border device, or more precisely a device at a border site, provides communication between different areas in a hierarchical SD-WAN topology. The hierarchical model divides a large WAN into multiple areas. Each area can independently use a hub-spoke or full-mesh topology, while selected border sites connect the local area to a centralized backbone area.
When a non-border site receives a route originating in another area, the route's next-hop site ID is changed to the border site in its own area. The local border device then forwards traffic toward the border site in the destination area or toward an interconnected hub site. Ordinary edge devices provide connectivity for their own sites but do not automatically perform cross-area transit.
Huawei describes border sites as members of both the level-2 area network and the level-1 backbone network.
These sites collectively implement interconnection between areas. Huawei further explains that inter-area routes point to border sites and recommends two border sites operating in active/standby mode for reliability.
Therefore, the correct answer is B.
21. Frage
Which of the following are WAN interconnection models for multi-branch campus networks?
Antwort: A,B,C
Begründung:
Huawei SD-WAN supports full-mesh, hub-spoke, and partial-mesh interconnection models. In a full-mesh topology, every site can communicate directly with the other sites. This model minimizes intermediate forwarding and is appropriate when branches frequently exchange latency-sensitive traffic such as voice, video, or collaborative application data.
In a hub-spoke topology, branch sites communicate with a central headquarters or data-center hub. Branch-to- branch traffic normally traverses that hub. The model is simple, scalable, and suitable for enterprises whose applications and shared resources are concentrated at headquarters.
Partial-mesh is used when most sites can communicate directly but some sites lack direct underlay connectivity or do not require direct tunnels. Those sites can communicate through a redirect or intermediate site. Huawei describes full-mesh, hub-spoke, and partial-mesh as supported topology designs and explains the role of a redirect site in partial-mesh networking.
"Partial-spoke" is not a defined SD-WAN topology model. A spoke is a role within hub-spoke networking rather than an independent partial-spoke topology. Therefore, A, B, and D are correct.
22. Frage
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