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| Section | Weight | Objectives |
|---|---|---|
| Data Center Network Security and O&M | 10% | - Network Troubleshooting Methods - iMaster NCE-FabricInsight Analytics - Network Security Policies - Traffic Audit and Monitoring |
| CloudEngine Switch Configuration | 20% | - CloudEngine OS Overview - VXLAN Configuration on CloudEngine - QinQ and VLAN Extension Technologies - BGP EVPN Configuration |
| CloudFabric Data Center Network Solution Overview | 10% | - Data Center Network Challenges and Trends - CloudFabric Solution Components and Functions - Huawei CloudFabric Solution Architecture |
| Data Center Interconnect | 10% | - EVPN Multi-Site Solution - DCI Technology Overview - Cross-Domain VXLAN Extension |
| iMaster NCE-Fabric Management | 15% | - Underlay Network Automation Deployment - Overlay Network Configuration - Network Simulation and Verification - Fabric Management Concepts |
| Underlying Transport Network Technologies | 15% | - Spine-Leaf Architecture - Overlay Network Technologies (VXLAN, NVGRE) - Underlay Network Planning and Design |
| VXLAN and EVPN Technologies | 20% | - EVPN Route Types and Applications - BGP EVPN Fundamentals - VXLAN Principles and Deployment - Multi-Site VXLAN EVPN Deployment |
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NEW QUESTION # 73
Which of the following technologies are Layer 4 load balancing technologies? (Select All that Apply)
Answer: B,C,D
Explanation:
Layer 4 load balancing operates at the transport layer (OSI Layer 4), using TCP/UDP protocols to distribute traffic based on information like IP addresses and port numbers, without inspecting the application-layer content (Layer 7). Let's evaluate each option:
A). Nginx: Nginx is a versatile web server and reverse proxy that supports both Layer 4 and Layer
7 load balancing. In its Layer 4 mode (e.g., with the stream module), it balances TCP/UDP traffic, making it a Layer 4 load balancing technology. This is widely used in Huawei's CloudFabric DCN solutions for traffic distribution. TRUE.
B). PPP (Point-to-Point Protocol): PPP is a Layer 2 protocol used for establishing direct connections between two nodes, typically in WAN scenarios (e.g., dial-up or VPNs). It does not perform load balancing at Layer 4 or any layer, as it's a point-to-point encapsulation protocol.
FALSE.
C). LVS (Linux Virtual Server): LVS is a high-performance, open-source load balancing solution integrated into the Linux kernel. It operates at Layer 4, using techniques like NAT, IP tunneling, or direct routing to distribute TCP/UDP traffic across backend servers. It's a core Layer 4 technology in enterprise DCNs. TRUE.
D). HAProxy: HAProxy is a high-availability load balancer that supports both Layer 4 (TCP mode) and Layer 7 (HTTP mode). In TCP mode, it balances traffic based on Layer 4 attributes, making it a Layer 4 load balancing technology. It's commonly deployed in Huawei DCN environments.
TRUE.
Thus, A (Nginx), C (LVS), and D (HAProxy) are Layer 4 load balancing technologies. PPP is not.
NEW QUESTION # 74
Which of the following statements is false about the overlay technology and VXLAN protocol?
Answer: D
Explanation:
VXLAN is an overlay technology that encapsulates Layer 2 frames within UDP packets to create scalable virtual networks, widely used in Huawei's data center architectures. Let's evaluate each statement:
A . A VXLAN tunnel endpoint that performs encapsulation is called a VNI: This is incorrect. A VXLAN Tunnel Endpoint (VTEP) is the device (physical or virtual) that performs encapsulation and decapsulation. The VNI (VXLAN Network Identifier) is a 24-bit field in the VXLAN header that identifies the virtual network, not the endpoint. FALSE.
B . VXLAN uses ECMP of the underlay network to improve network forwarding performance: Equal-Cost Multi-Path (ECMP) routing in the underlay network allows VXLAN to distribute traffic across multiple paths, enhancing load balancing and performance. This is a standard feature in Huawei's VXLAN implementations. TRUE.
C . A VXLAN network is built based on UDP: VXLAN encapsulates Ethernet frames within UDP packets (using port 4789), making it a UDP-based overlay protocol. This is a core characteristic of VXLAN. TRUE.
D . VXLAN expands the number of subnets to 16 million and supports multi-tenancy: With a 24-bit VNI, VXLAN supports up to 16 million (2
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