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| Section | Objectives |
|---|---|
| Topic 1: Data Center Switching Technologies | - Ethernet Switching in Data Centers
|
| Topic 2: Data Center Routing | - Routing Protocols in DC Environment
|
| Topic 3: O&M and Troubleshooting | - Operations and Maintenance
|
| Topic 4: VXLAN Technology | - Overlay Networking
|
| Topic 5: Data Center Network Fundamentals | - Data Center Architecture Overview
|
| Topic 6: SDN and Network Automation | - Software Defined Networking
|
| Topic 7: Network Security and Reliability | - Data Center Security Mechanisms
|
Topexamは客様の要求を満たせていい評判をうけいたします。たくさんのひとは弊社の商品を使って、H12-893_V1.0試験に順調に合格しました。
質問 # 29
In ZTP networking, which of the following addresses can be delivered by a DHCP server? (Select All that Apply)
正解：A、C、D
解説：
Zero Touch Provisioning (ZTP) in Huawei's CloudFabric automates device setup using DHCP.
Let's evaluate each option:
A). Default gateway address: This is true. DHCP can deliver the default gateway address to configure routing for the device. TRUE.
B). SFTP server address: This is false. SFTP server addresses are not standard DHCP options; they may be configured manually or via other protocols (e.g., TFTP for boot files). FALSE.
C). DNS server address: This is true. DHCP can provide DNS server addresses (Option 6) for name resolution during ZTP. TRUE.
D). Temporary management IP address: This is true. DHCP assigns temporary IPs (e.g., Option
50) for management during initial provisioning in ZTP. TRUE.
Thus, A, C, and D can be delivered by a DHCP server in ZTP.
質問 # 30
The figure shows an incomplete VXLAN packet format.
Which of the following positions should the VXLAN header be inserted into so that the packet format is complete?
正解：C
解説：
The VXLAN header should follow the UDP header (Position 3), but since Position 3 is not an option and the insertion point is before the Inner Ethernet Header (Position 4), the question's options seem misaligned. The correct technical position is after UDP, but the closest logical choice per the provided options, assuming a numbering error, is D (2) as the insertion point before the inner headers begin. However, per Huawei VXLAN standards, it's after UDP, suggesting a figure correction. The answer is D (2) based on the given options' intent.
質問 # 31
A Huawei data center uses distributed gateways on leaf switches. Which advantage does this design primarily provide compared with a centralized gateway architecture?
正解：B
解説：
Distributed gateways allow local routing at the access layer, reducing unnecessary traffic through centralized devices. This minimizes latency for east-west traffic and improves scalability. BGP remains important for EVPN control-plane operations.
質問 # 32
iMaster NCE-Fabric is Huawei's DC controller. Tenants can use it to create VPCs and deploy logical networks as required. After logical NEs are deployed, the corresponding network configurations are delivered to underlying network devices. Which of the following statements is false about the delivered network configurations?
正解：B
解説：
iMaster NCE-Fabric automates network configuration delivery in Huawei's CloudFabric. Let's evaluate each statement:
A . Logical switches are mainly used for Layer 3 communication between hosts on a VXLAN network. These switches correspond to Layer 3 gateway configurations such as VBDIF interface and VPN instance configurations on physical devices: This is false. Logical switches in iMaster NCE-Fabric primarily handle Layer 2 communication (e.g., bridging within a VNI), corresponding to Bridge Domains (BDs) and Layer 2 VNIs. Layer 3 communication is managed by gateways, not logical switches. FALSE.
B . An end port represents an online host. It corresponds to the traffic encapsulation type (whether a VLAN tag is carried) configured on a Layer 2 sub-interface of a physical device: This is true. End ports map to host connections, with encapsulation (VLAN-tagged or untagged) configured on sub-interfaces. TRUE.
C . A logical port is equivalent to an independent physical port that is used by a host to connect to a VXLAN network. It corresponds to the Layer 2 sub-interface configuration on a physical device: This is true. Logical ports represent host connections, mapped to Layer 2 sub-interfaces for VXLAN access. TRUE.
D . Logical switches are mainly used for Layer 2 communication between hosts on a VXLAN network. These switches correspond to BD and Layer 2 VNI configurations on physical devices: This is true. Logical switches facilitate Layer 2 connectivity, aligning with BD and VNI settings. TRUE.
Thus, A is the false statement because logical switches are for Layer 2, not Layer 3, communication.
質問 # 33
VXLAN is a network virtualization technology that uses MAC-in-UDP encapsulation. What is the destination port number used during UDP encapsulation?
正解：B
解説：
VXLAN (Virtual Extensible LAN) is a network overlay technology that encapsulates Layer 2 Ethernet frames within UDP packets to extend Layer 2 networks over Layer 3 infrastructure, widely used in Huawei's CloudFabric data center solutions. The encapsulation process, often referred to as "MAC-in-UDP," involves wrapping the original Ethernet frame (including MAC addresses) inside a UDP packet.
UDP Encapsulation: The VXLAN header follows the UDP header, and the destination UDP port number identifies VXLAN traffic. The Internet Assigned Numbers Authority (IANA) has officially assigned UDP port 4789 as the default destination port for VXLAN.
Options Analysis:
A). 4787: This is not a standard VXLAN port and is not recognized by IANA or Huawei documentation.
B). 4789: This is the correct and widely adopted destination port for VXLAN, as specified in RFC
7348 and implemented in Huawei's VXLAN configurations.
C). 4790: This port is not associated with VXLAN and is unused in this context.
D). 4788: This is not a standard VXLAN port; it may be confused with other protocols but is not correct for VXLAN.
Thus, the destination port number used during UDP encapsulation in VXLAN is B (4789), aligning with Huawei's VXLAN implementation standards.
質問 # 34
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