H12-921_V1.0 HCIE-Data Center Network (Written) V1.0 Exam Questions

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2. 1.Which of the following devices can be used as service nodes in the service chain? A. Firewall B. WAF C. LoadBalance D. NIP Answer: A B C D 2.Which of the following descriptions of the open source OpenStack Glance component is correct? A. Modifying an instance that is started based on an image is actually modifying the image B. Glance provides the ability to discover, register, and retrieve virtual machine images C. Virtual Machine Instance images provided by Glance can only be placed in object storage provided by Swift D. You can launch only one instance from the same image Answer: B 3.An MPI collection operation is when all processes in a communication space work together to accomplish a specific data operation and transmission. Which of the following items fall into a common collection action type? A. MPI_Scatter B. MPI_AllReduce C. MPI_Gather D. P2P Answer: A B C 4.Which of the following components in Huawei's intelligent lossless network solution architecture for multi-computing scenarios offloads the RDMA input layer and the following protocol stacks to the NIC hardware, so that peripherals can directly access the memory of the remote host? A. NIC driver B. SmartNIC C. Network equipment D. iMasterNCEFabric Answer: B 5.Which of the following device statistics cannot be viewed in the device management of iMaster NCE-Fabric? A. switchboard B. router C. firewall D. server Answer: D 6.What is correct about the following description of Docker? A. Image in Docker can be regarded as a special file system, which only provides the programs required by the container runtime, and the libraries, resources, configurations, and other files required by the 2 / 7

3. container runtime are hosted by the host Machine OS provides B. The Docker engine obtains the image from the repository and runs the container on the corresponding host C. Image files are stored centrally in a repository and can be public or private D. Docker containers are created based on images, and a running container is a process running on a Docker host Answer: B C D Explanation: Parse: 7.Which of the following describes the error in the CloudFabric network virtualization scenario? A. Network administrators control the network through iMaster NCE-Fabric B. When the compute administrator creates the VM, select the PortGroup for the corresponding network C. Compute administrators manage compute resources through VMM D. iMaster NCE-Fabric obtains the connection between the host and the TOR port through VMM Answer: D 8.When the cloud platform creates a VM resource, it needs to call multiple components, such as Nova, Cinder, Glance, etc., and the authentication and authentication between the components depends on which of the following options? A. Freezer B. Watcher C. Keystone D. Zun Answer: C 9.In Huawei's CloudFabric solution, in the scenario where the Border Leaf and Service Leaf are separated, what are the correct descriptions of the following principles for traffic orchestration between internal and external networks? A. The controller creates the corresponding tenant VRF and egress VRF on the Border Leaf based on the tenant network and the external network 3 / 7

4. B. The route to the external network on the border leaf is delivered by the iMaster NCE-Fabric controller, and only static routes can be delivered to connect with the external network C. The controller creates the corresponding tenant VRF and egress VRF on the Service Leaf based on the tenant network and the external network D. The backhaul route from the external network to the tenant network needs to be configured by the external network and cannot be delivered by the iMaster NCE-Fabric controller Answer: C D 10.Runbook action (An action is composed of multiple steps, in which of the following APIs should each step be required??) A. RESTful B. NETCONF C. OpenFlow D. gRPC Answer: A 11.Which of the following falls under the technical layer of the AI industry? A. Autonomous driving B. machine learning C. artificial intelligence D. robot Answer: B 12.Which of the following server components is used as a temporary place to store program instructions, data, and intermediate results during computation? A. memory B. hard disk C. flash memory D. CPU Answer: A 13.As shown in the figure in the Multi-PoD solution of the CloudFabric solution, in the active/standby egress scenario, when the Border Leaf is the primary failure, the VM belonging to VPC1 is located. What traffic path will be used to access the external network? 4 / 7

5. A. 1 B. 2 C. 3 D. 4 Answer: D Explanation: Analysis: The borderleaf is mainly suspended, and the traffic is accessed to the Internet through the border leaf standby. 14.Which of the following IPv6 transformation solutions for data center networks only needs to transform the egress gateway to support IPV4/IPv6 dual-stack services, which requires less transformation effort and less impact on existing network services? A. Dual-stack renovation scheme for Internet access area B. Create an IPv6 single-stack solution for Internet access zones C. Export NAT64 retrofit scheme D. Dual-stack transition and transformation scheme for Internet access area Answer: C Explanation: Analysis: Features: It is suitable for temporary solutions in the initial stage, and is not recommended. Advantages: Only need to transform the egress to dual-stack and deploy NAT64, which requires less transformation work, less impact on live network services, and can quickly provide IPv6 services. Disadvantages: NAT conversion will cause ALG problems, and the solution cannot smoothly evolve to the 5 / 7

6. long-term goal of "network-wide single-stack", and the evolution ability is poor. 15.Which of the following protocol standards is led by Huawei to solve the PFC head-resistance problem? A. IEEE 802.1AB B. IEEE P802.1CQ C. IEEE 802.1Qcp D. IEEE P802.1Qcz Answer: D Explanation: Resolution: • ECN was originally defined in RFC3168 and is used to define network congestion identity. PFC is defined in 802.1Qbb, similar to IEEE 802.3x Pause flow control mechanism, but supports independent operation based on each priority, precise control, so that different priorities do not affect each other. 802.1Q has been evolving, 802.1Qcz (CI, Congestion Isolation) is a newly defined protocol standard led by Huawei to solve the problem of PFC Head of Line Blocking (HOLB). 16.Which of the following types does the iMasterNCEFabricRunbook work contain? A. Do B. Retry C. Rollback D. DryRun Answer: A B C D 17.Which of the following is not included in the PCIe fabric? A. Router B. Switch C. Root Complex D. PCIe Endpoint Answer: A Explanation: 18.What are the correct terms of the following descriptions of underlays and overlay networks? A. Underlay is logically isolated from overlay, and as long as the routes between tunnel endpoints are reachable, the failure of the underlay network will not directly affect the overlay network 6 / 7

7. B. Overlay Routes for the network are generated by routes that are ingested into the underlay network C. When implementing the overlay technology in the underlay network, the original underlay network needs to be modified to a certain extent D. From the perspective of an overlay network, the underlay network is transparent to devices connected outside of the VXLAN tunnel endpoints Answer: A D 19.What are the correct items in the following descriptions of the design of the CloudFabric intelligent lossless multivariate computing physical network? A. You can choose a two-layer or three-layer networking architecture based on the scale B. The number of Spine switches needs to be considered based on the total number of upstream interfaces across all Leaf switches C. Leaf switches can be deployed independently D. To ensure high reliability on the access side, the server must be single-homed to the LEAF switch Answer: A B C 20.Which of the following types of virtual NICs can be created by the Linux server? A. Tun B. Tap C. Linux Bridge D. OVS Answer: A B 21.Which of the following types of routes does BGPMVPN advertise multicast source information? A. Type 1 Routing (Intra-ASI-PMSIA-Droute). B. 5 Class Routing (SourceActiveA-Droute). C. 6 Class Routing (Share Tree Join route). D. 7 Class Routing (SourceTreeJoinroute). Answer: B 22.Which of the following is wrong in the description of communication between VMs in a DVS distributed virtual switch environment in server virtualization? A. VMs in the same port group, if they are on different hosts, can reach DVS on the destination host through the uplink of DVS and finally complete communication with the remote VM B. VMs in different port groups (belonging to different VLANs) need to go through the uplink of the DVS to the physical switch, through which the VLAN is implemented Communications C. VMs in the same port group, if they are in the same host, can communicate directly via DVS D. VMs that are in different DVSs but belong to the same VLAN port group can communicate directly over DVS Answer: D Explanation: Resolution: VMs that are in different DVSs but belong to the same VLAN port group cannot communicate directly with the DVS 7 / 7