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| Section | Objectives |
|---|---|
| Topic 1: Data Center Network Fundamentals | - Data Center Architecture Overview
|
| Topic 2: O&M and Troubleshooting | - Operations and Maintenance
|
| Topic 3: Network Security and Reliability | - Data Center Security Mechanisms
|
| Topic 4: Data Center Routing | - Routing Protocols in DC Environment
|
| Topic 5: Data Center Switching Technologies | - Ethernet Switching in Data Centers
|
| Topic 6: VXLAN Technology | - Overlay Networking
|
| Topic 7: SDN and Network Automation | - Software Defined Networking
|
>> Valid H12-893_V1.0 Test Notes <<
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NEW QUESTION # 16
VXLAN is a network virtualization technology that uses MAC-in-UDP encapsulation. What is the destination port number used during UDP encapsulation?
Answer: B
Explanation:
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.
NEW QUESTION # 17
In which of the following phases can CloudFabric implement full-lifecycle automatic network management and control? (Select All that Apply)
Answer: A,B,C,D
Explanation:
Huawei's CloudFabric solution provides an SDN-based framework for data center network management, supporting automation across the network lifecycle. Let's evaluate each phase:
A). Planning and construction: This is true. CloudFabric automates network design, resource allocation, and deployment during the planning and construction phase using tools like iMaster NCE. TRUE.
B). Service provisioning: This is true. Automated service orchestration (e.g., VXLAN tunnel setup, tenant configuration) is a key feature during provisioning. TRUE.
C). O&M and monitoring: This is true. CloudFabric offers real-time monitoring, fault detection, and performance optimization through centralized management. TRUE.
D). Change optimization: This is true. The solution supports automated upgrades, policy adjustments, and optimization based on analytics, covering the change management phase.
TRUE.
All phases A, B, C, and D are supported by CloudFabric's full-lifecycle automation.
NEW QUESTION # 18
When deploying VXLAN, why is an IP underlay generally preferred over a large Layer 2 network?
Answer: D
Explanation:
An IP underlay provides scalable routing, rapid convergence, and efficient ECMP forwarding.
Large Layer 2 domains are more susceptible to flooding and spanning-tree limitations, reducing overall scalability and operational efficiency.
NEW QUESTION # 19
A tenant requires communication only within its own virtual network despite sharing the same VXLAN infrastructure with multiple business units. Which identifier uniquely distinguishes VXLAN segments?
Answer: A
Explanation:
The VXLAN Network Identifier (VNI) provides up to approximately 16 million isolated Layer 2 segments. VLAN IDs are limited to 4094 usable values and therefore offer much smaller scalability than VXLAN VNIs.
NEW QUESTION # 20
BGP EVPN defines several types of BGP EVPN routes by extending BGP. Type ? routes are used to advertise host IP routes and external network routes. (Enter only digits.)
Answer:
Explanation:
5
Explanation:
BGP EVPN (Ethernet VPN) extends BGP to provide control plane functionality for VXLAN overlays, including in Huawei's data center networks. EVPN defines several route types to advertise different types of information:
Type 1: Auto-discovery routes for EVPN instances.
Type 2: MAC/IP Advertisement routes for host reachability.
Type 3: Inclusive Multicast Ethernet Tag routes for multicast traffic.
Type 4: Ethernet Segment routes for multi-homing.
Type 5: IP Prefix routes for advertising host IP routes and external network routes, enabling inter-subnet and external connectivity.
The question specifies routes used to advertise "host IP routes and external network routes," which aligns with Type 5 routes. These routes carry IP prefix information and a Layer 3 VNI, facilitating Layer 3 routing within the EVPN domain or to external networks. Thus, the answer is 5.
NEW QUESTION # 21
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