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| Section | Objectives |
|---|---|
| Topic 1: Huawei Campus Network Solutions | - CloudCampus solution architecture - iMaster NCE-Campus management platform |
| Topic 2: Campus Network Fundamentals | - Typical campus network deployment models - Enterprise campus network architecture principles |
| Topic 3: Network Security Design | - Access control strategies - Campus security architecture considerations |
| Topic 4: WLAN Planning and Design | - Capacity and performance design considerations - Wireless coverage planning |
| Topic 5: Switching and Routing in Campus Networks | - VLAN and segmentation design - Layer 2 and Layer 3 design principles |
| Topic 6: Presales Solution Design | - Customer requirement analysis - Solution proposal and design methodology |
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55. Frage
The AirEngine 8771-X1T has dynamic-zoom smart antennas that can switch between omnidirectional and high-density modes.
Antwort: A
Begründung:
The statement is true. The AirEngine 8771-X1T uses dynamic-zoom smart-antenna technology that can adapt its radiation characteristics according to the deployment environment. In omnidirectional mode, the antenna pattern is optimized to provide broad and balanced coverage, making it appropriate for ordinary offices, corridors, classrooms, and other environments where users are distributed over a relatively large area.
In high-density mode, the antenna pattern is adjusted to concentrate radio energy more effectively within the intended service area. This reduces unnecessary signal leakage, limits interference between neighboring APs, and improves concurrent-user performance in lecture halls, conference rooms, auditoriums, and similar high- density environments.
The switching capability is more effective than using a permanently fixed antenna pattern because WLAN conditions can change as users move and traffic density increases or decreases. Huawei's training material states that dynamic-zoom smart antennas dynamically switch between omnidirectional and high-density modes, improving coverage in omnidirectional mode while strengthening the user experience in high-density scenarios. Therefore, option A is correct.
56. Frage
Huawei provides an innovative technology that can maintain smooth video when traffic packet loss between enterprise branches reaches up to 20%. Which technology provides this capability?
Antwort: B
Begründung:
A-FEC, or Adaptive Forward Error Correction, is the correct technology. It protects delay-sensitive traffic by adding calculated redundant packets to the original packet stream. If some original packets are lost during WAN transmission, the receiving edge device can reconstruct them using the surviving original and redundant packets rather than waiting for end-to-end retransmission.
The key distinction between ordinary FEC and A-FEC is adaptation. With A-FEC, the receiving device reports real-time packet-loss and continuous-loss information to the transmitting device through FEC acknowledgement messages. The transmitting edge then dynamically increases or decreases the redundancy ratio according to actual network conditions. This provides stronger recovery during severe loss while avoiding unnecessary bandwidth overhead when link quality improves. Huawei describes this feedback- controlled adjustment as a mechanism that can alleviate or eliminate the impact of packet loss.
IFIT and IPCA are primarily measurement and service-quality analysis technologies; they do not reconstruct lost video packets. Fixed FEC does not adapt its redundancy level as effectively to changing loss conditions.
Therefore, the technology intended for smooth video under packet loss of up to 20% is A-FEC.
57. Frage
Which of the following WLAN networking solutions is recommended when there are 15,000 wireless terminals on the customer network?
Antwort: A
Begründung:
A network serving 15,000 wireless terminals is a large-scale WLAN and should use a standalone WAC solution. A dedicated WAC provides independent controller resources, scalable AP and user management, centralized WLAN policy control, and the ability to deploy controller redundancy without tying wireless- control capacity directly to a specific core-switch service card.
Huawei recommends a standalone WAC when the wireless network scale is large or when the wireless network is deployed independently over an existing wired campus. The WAC is typically connected to the aggregation or core layer in off-path mode, and VRRP hot standby can be used to improve reliability.
Native WAC solutions are valuable for unified wired and wireless management, authentication, forwarding, and policy enforcement. However, for a very large number of wireless terminals, the controller platform must be selected according to user, AP, traffic, and forwarding-capacity specifications. A standalone WAC allows the wireless control plane to be sized and expanded independently.
Option C provides the dedicated WAC together with the required core and aggregation or access infrastructure. Therefore, it is the recommended architecture for 15,000 wireless terminals.
58. Frage
Which of the following are common terminal identification methods?
Antwort: A,B,C,D
Begründung:
All four options are recognized terminal identification methods. MAC OUI examines the first three bytes of a device's MAC address to determine its manufacturer, although it generally cannot identify the exact model or operating system. DHCP option identification analyzes fields such as DHCP options 12, 55, and 60, which can reveal the hostname, parameter-request list, vendor class, and other terminal characteristics. SNMP query is an active identification method that retrieves device details from relevant MIB objects and is particularly useful for printers, network devices, and other SNMP-capable equipment.
Nmap is also an active scanning method. It analyzes open ports, service responses, protocol behavior, and operating-system fingerprints to estimate a terminal's device type and OS. Huawei distinguishes information- reporting methods from proactive scanning methods: MAC OUI and DHCP options generally use information observed in traffic, whereas SNMP and Nmap actively query or scan the endpoint. iMaster NCE-Campus can correlate multiple fingerprints to improve identification accuracy and automatically apply terminal-specific access policies.
59. Frage
It is recommended that policy association be deployed between the access and aggregation layers when distributed VXLAN gateways are used and VXLAN is deployed across the core and aggregation layers.
Antwort: A
Begründung:
The statement is true. In this three-layer campus design, aggregation switches function as VXLAN edge nodes and distributed gateways, while access switches provide terminal connectivity. Policy association allows the access switches to participate in user admission and policy enforcement without requiring them to support full VXLAN functions.
The access switch collects terminal access information and associates user traffic with the appropriate service or policy. The aggregation switch, acting as the fabric edge and VXLAN tunnel endpoint, performs VXLAN encapsulation, distributed gateway forwarding, and policy-related operations. Huawei specifically states that when aggregation switches operate as edge nodes, access switches do not need to support VXLAN and can cooperate with aggregation switches through policy association. This also permits legacy access switches to be reused.
The design reduces upgrade costs and avoids extending complex overlay configurations to every access device. Huawei's automated virtual-network deployment model also explicitly includes policy association between the aggregation and access layers, allowing access switches without VXLAN capability to operate as transparent or associated access nodes. Therefore, option A is correct.
60. Frage
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