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| Certification Vendor: | Huawei |
|---|---|
| Exam Name: | Huawei Certified ICT Professional - Data Center Network V1.0 |
| Exam Number: | H12-893_V1.0 |
| Real Exam Qty: | 60 |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Available Languages: | Chinese, English |
| Related Certifications: | HCIA-Data Center Network HCIE-Data Center Network |
| Exam Format: | True/false, Drag-and-drop, Multiple-choice, Single-choice |
| Passing Score: | 600/1000 |
| Exam Price: | 300 USD |
| Recommended Training: | HCIP-Data Center Network V1.0 Official Training |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Huawei H12-893_V1.0 Sample Questions |
| Exam Way: | Online or Onsite at Pearson VUE test centers |
| Pre Condition: | Recommended: HCIA-Data Center Network certification or equivalent knowledge |
| Official Syllabus URL: | https://e.huawei.com/en/talent/certification/exam/h12-893_v1.0 |
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NEW QUESTION # 23
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 # 24
A VXLAN tunnel is identified by a pair of VTEP IP addresses. During VXLAN tunnel establishment, the local and remote VTEPs attempt to obtain each other's IP addresses. If the VTEP IP addresses are reachable to each other at Layer 3, a VXLAN tunnel can be established.
Answer: A
Explanation:
VXLAN (Virtual Extensible LAN) tunnels are used to encapsulate Layer 2 traffic over a Layer 3 network, a key feature in Huawei's data center solutions. The endpoints of a VXLAN tunnel are VXLAN Tunnel Endpoints (VTEPs), identified by their IP addresses.
Tunnel Identification: A VXLAN tunnel is uniquely identified by the pair of VTEP IP addresses (local and remote), along with the VNI (VXLAN Network Identifier). This pair ensures the tunnel is specific to the communication path between the two VTEPs.
Tunnel Establishment: During setup, VTEPs exchange information to learn each other's IP addresses. This can occur manually (static configuration) or dynamically (e.g., via BGP EVPN).
The underlay network must provide Layer 3 reachability between the VTEP IP addresses, typically using routing protocols (e.g., OSPF, BGP) to ensure IP connectivity.
Reachability Condition: If the local and remote VTEP IP addresses are reachable at Layer 3, the tunnel can be established, allowing encapsulation and decapsulation of VXLAN traffic. This is a fundamental requirement in Huawei's VXLAN implementation.
The statement is TRUE (A) because a VXLAN tunnel's identification and establishment depend on reachable VTEP IP address pairs at Layer 3.
NEW QUESTION # 25
Which of the following protocols is used to back up session tables between the active and standby firewalls in the hot standby scenario?
Answer: A
Explanation:
In a hot standby scenario, firewalls (e.g., Huawei USG series) maintain high availability by synchronizing session tables between active and standby devices to ensure seamless failover.
Let's evaluate each protocol:
A). M-LAG (Multi-Chassis Link Aggregation): M-LAG is a link aggregation technology for switches, not designed for session table backup between firewalls. Incorrect.
B). VRRP (Virtual Router Redundancy Protocol): VRRP provides gateway redundancy by electing a master router, but it does not handle session table synchronization between firewalls. Incorrect.
C). BFD (Bidirectional Forwarding Detection): BFD is a fast failure detection protocol used with routing protocols, not for session table backup. Incorrect.
D). HRP (Hot Standby Redundancy Protocol): HRP is Huawei's proprietary protocol specifically designed for firewall hot standby scenarios. It synchronizes session tables, configuration data, and status information between active and standby firewalls to ensure stateful failover. Correct.
Thus, the answer is D (HRP).
NEW QUESTION # 26
To allow access to a VXLAN network, you need to configure service access points on devices. There are two access modes: Layer ? sub-interface and binding. (Enter the acronym in uppercase letters.)
Answer:
Explanation:
3
Explanation:
VXLAN (Virtual Extensible LAN) is a network overlay technology that extends Layer 2 networks over a Layer 3 underlay, commonly implemented in Huawei's CloudFabric data center solutions. To enable access to a VXLAN network, service access points (e.g., interfaces or sub-interfaces) must be configured on devices such as switches or routers acting as VXLAN Tunnel Endpoints (VTEPs). The question mentions two access modes: "Layer ? sub-interface" and "binding," with the task to fill in the layer acronym in uppercase letters.
Context Analysis: The missing layer is indicated by a "?" and is part of a sub-interface configuration. In networking, sub-interfaces are typically associated with Layer 3 (e.g., for VLAN tagging or VXLAN integration), where they handle IP routing or mapping to overlay networks.
Access Modes:
Layer 3 Sub-Interface: This mode involves configuring a sub-interface on a Layer 3 device (e.g., a router or Layer 3 switch) to terminate VXLAN tunnels and perform routing. The sub-interface is associated with a VNI (VXLAN Network Identifier) and often uses a Layer 3 protocol (e.g., BGP EVPN) to connect to the VXLAN overlay.
Binding: This likely refers to binding a VNI to a Bridge Domain (BD) or interface, a common practice in Huawei's VXLAN configuration to map the overlay network to a physical or logical port. This can occur at Layer 2 or Layer 3, but the sub-interface context suggests Layer 3 involvement.
The question's structure implies the layer number for the sub-interface mode, which is Layer 3 in VXLAN contexts for routing and gateway functions. Thus, the acronym (digit) to enter is 3.
NEW QUESTION # 27
An engineer wants automatic detection of failed links while maintaining rapid convergence in the underlay network. Which protocol is commonly paired with routing protocols for this purpose?
Answer: C
Explanation:
Bidirectional Forwarding Detection rapidly identifies forwarding failures and notifies routing protocols, enabling much faster convergence than relying solely on routing protocol timers. FTP, SNMP, and NTP serve unrelated management functions.
NEW QUESTION # 28
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