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| Section | Objectives |
|---|---|
| Topic 1: O&M and Troubleshooting | - Operations and Maintenance
|
| Topic 2: Data Center Routing | - Routing Protocols in DC Environment
|
| Topic 3: Network Security and Reliability | - Data Center Security Mechanisms
|
| Topic 4: Data Center Switching Technologies | - Ethernet Switching in Data Centers
|
| Topic 5: VXLAN Technology | - Overlay Networking
|
| Topic 6: Data Center Network Fundamentals | - Data Center Architecture Overview
|
| Topic 7: SDN and Network Automation | - Software Defined Networking
|
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NEW QUESTION # 86
Which of the following is not an advantage of link aggregation on CE series switches?
Answer: A
Explanation:
Link aggregation, often implemented using Link Aggregation Control Protocol (LACP) on Huawei CloudEngine (CE) series switches, combines multiple physical links into a single logical link to enhance network performance and resilience. The primary advantages include:
Load Balancing Supported (B): Link aggregation distributes traffic across multiple links based on hashing algorithms (e.g., source/destination IP or MAC), improving load distribution and preventing any single link from becoming a bottleneck.
Increased Bandwidth (C): By aggregating multiple links (e.g., 1 Gbps ports into a 4 Gbps logical link), the total available bandwidth increases proportionally to the number of links.
Improved Reliability (D): If one link fails, traffic is automatically redistributed to the remaining links, ensuring continuous connectivity and high availability.
However, Improved Forwarding Performance of Switches (A) is not a direct advantage. Forwarding performance relates to the switch's internal packet processing capabilities (e.g., ASIC performance, forwarding table size), which link aggregation does not inherently enhance. While it optimizes link utilization, it doesn't improve the switch's intrinsic forwarding rate or reduce latency at the hardware level. This aligns with Huawei's CE series switch documentation, where link aggregation is described as enhancing bandwidth and reliability, not the switch's core forwarding engine.
NEW QUESTION # 87
Which of the following statements are true about a routing design that employs OSPF on the underlay network of a DC? (Select All that Apply)
Answer: A,D
Explanation:
OSPF (Open Shortest Path First) is a routing protocol used in the underlay network of Huawei's CloudFabric DCNs. Let's evaluate each statement:
A . Typically, the IP address of Loopback0 is configured as the VTEP IP address and the same IP address is planned for active-active leaf nodes in the same group: This is true. Loopback0 IP is commonly used as the VTEP IP for stability, and in active-active leaf node groups (e.g., M-LAG), the same IP can be configured with VRRP or anycast to ensure consistency. TRUE.
B . The network type of spine and leaf nodes can be set to P2P in order to accelerate convergence: This is true. Setting OSPF network type to Point-to-Point (P2P) on spine-leaf links reduces overhead (e.g., no DR/BDR election) and speeds up convergence, a recommended practice in Huawei DCNs. TRUE.
C . This routing design is recommended when the DC has more than 300 switches: This is false. OSPF is suitable for smaller to medium-sized DCNs (e.g., up to 200-300 switches). For larger networks (>300 switches), EBGP is preferred due to better scalability and reduced complexity. FALSE.
D . It is recommended that all devices be planned in Area 0: This is false. While a single Area 0 is possible for small DCNs, multi-area OSPF is recommended for larger networks to manage scalability and reduce routing table size, avoiding a flat Area 0 design. FALSE.
Thus, A and B are true statements about OSPF routing design in a DC underlay.
NEW QUESTION # 88
The underlay routing protocol has already converged, but one VTEP cannot establish EVPN sessions with another. Which prerequisite should be verified first?
Answer: A
Explanation:
Even with complete IP connectivity, EVPN requires operational MP-BGP neighbor relationships.
Without successful BGP session establishment, overlay routes cannot be exchanged, preventing endpoint discovery and VXLAN communication.
NEW QUESTION # 89
Which of the following servers are built into iMaster NCE-Fabric to provide related services? (Select All that Apply)
Answer: A,D
Explanation:
Huawei's iMaster NCE-Fabric is an SDN controller for the CloudFabric Solution, providing network orchestration and management. It includes built-in servers to support its operations. Let's evaluate each option:
A . DNS server: This is false. iMaster NCE-Fabric does not include a built-in DNS server; it relies on external DNS services for name resolution, configured during deployment. FALSE.
B . RADIUS authentication server: This is false. RADIUS authentication is typically handled by external AAA servers; iMaster NCE-Fabric integrates with them but does not embed a RADIUS server. FALSE.
C . DHCP server: This is true. iMaster NCE-Fabric includes a built-in DHCP server to assign temporary IP addresses during Zero Touch Provisioning (ZTP) or initial device configuration. TRUE.
D . Version file server: This is true. A version file server is built into iMaster NCE-Fabric to store and deliver software images or configuration files for device upgrades and management. TRUE.
Thus, C (DHCP server) and D (Version file server) are built into iMaster NCE-Fabric.
NEW QUESTION # 90
Which of the following nodes connects computing resources such as virtual and physical servers to a VXLAN fabric?
Answer: D
Explanation:
In Huawei's spine-leaf VXLAN fabric (e.g., CloudFabric), nodes have specific roles:
A . DCI leaf: Data Center Interconnect (DCI) leaf nodes connect different data centers, not internal computing resources. Incorrect.
B . Server leaf: Server leaf nodes connect computing resources (virtual servers via hypervisors, physical servers) to the VXLAN fabric, handling access traffic. This is the correct role for connecting servers. Correct.
C . Border leaf: Border leaf nodes connect the DCN to external networks, not internal computing resources. Incorrect.
D . Service leaf: Service leaf nodes connect to value-added services (e.g., firewalls), not directly to computing resources like servers. Incorrect.
Thus, the answer is B (Server leaf).
NEW QUESTION # 91
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