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Huawei H12-811_V2.0 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Ethernet Technology Basics: Covers Ethernet standards, switching principles, VLANs, and Layer 2 protocols used in enterprise network environments.
Topic 2
  • Network O&M and Troubleshooting: Covers network operation and maintenance practices, common diagnostic tools, and methodologies for identifying and resolving network faults.
Topic 3
  • Data Communication Network Basics: Covers foundational concepts of data communication networks including network types, reference models (OSI
  • TCP-IP), and basic device roles.
Topic 4
  • Data Center Network Basics: Covers the architecture and key technologies used in modern data center networks including virtualization and high-availability design concepts.
Topic 5
  • Typical Campus Networking Solution: Covers end-to-end campus network design scenarios, integrating switching, routing, security, and wireless technologies into a unified solution.
Topic 6
  • IP Technology Basics: Covers IPv4
  • IPv6 addressing, subnetting, routing fundamentals, and common routing protocols such as OSPF, RIP, and static routing.
Topic 7
  • WLAN Technology Basics: Covers wireless LAN standards, components such as APs and ACs, WLAN architecture, and basic configuration principles.

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Huawei HCIA-Datacom V2.0 Sample Questions (Q80-Q85):

NEW QUESTION # 80
In the 802.11 standard, the 2.4 GHz frequency band is divided into 14 overlapping, staggered 20 MHz channels, numbered from 1 to 14.

Answer: A

Explanation:
The IEEE 802.11 channel plan for the 2.4 GHz ISM band defines channels numbered 1 through 14, with adjacent channel center frequencies separated by 5 MHz. Because a traditional 20 MHz Wi-Fi channel occupies substantially more spectrum than the 5 MHz center-frequency spacing, neighboring channels overlap. This is why WLAN planning normally uses a limited set of non-overlapping or minimally overlapping channels, such as 1, 6, and 11 in many regulatory domains. The fact that fourteen channel numbers exist in the standard does not mean that every country permits operation on every one of them.
Regulatory domains restrict the usable subset; for example, channel 14 is not generally available worldwide and has historically been associated with specific Japanese operation. Huawei APs apply the configured regulatory domain to determine which channels may actually be selected. The statement concerns the standard channelization itself rather than regional permission to use every channel. On that basis, the statement is TRUE and option A is correct.


NEW QUESTION # 81
Which of the following phases are required for establishing a connection between an SSH server and an SSH client? (Select all that apply)

Answer: A,B,C,D

Explanation:
The establishment of an SSH connection includes multiple mandatory phases that ensure both secure communication and authenticated access. First, the SSH client and server perform version negotiation to determine a mutually supported SSH protocol version. Then they carry out algorithm negotiation, during which they agree on the encryption algorithm, key exchange algorithm, integrity algorithm, and other security parameters to be used for the session.
After that, the peers perform key exchange, which is used to derive shared session keys securely over an insecure network. This stage is essential because it enables subsequent communication to be encrypted and protected against interception. Finally, once the secure channel has been established, user authentication is performed so that the server can verify the identity of the client user. This can be done using a password, public key, or other supported authentication method. Therefore, all four options are required phases in the SSH connection establishment process. HCIA-Datacom emphasizes these steps because SSH is a core secure management protocol used to replace insecure protocols such as Telnet and FTP in modern network operation and maintenance.


NEW QUESTION # 82
With the continuous development of AI, data center application scenarios are gradually divided into general-purpose computing and intelligent computing scenarios. Data centers need to ensure service continuity of general-purpose computing clusters while unleashing the full potential of intelligent computing clusters, so as to guarantee stable and efficient operation in the AI era.
Which of the following statements are true about the service requirements of data center networks in the two scenarios? (Select all that apply)

Answer: A,C

Explanation:
The correct statements are B and C. Option B is true because general-purpose computing data center networks focus heavily on stability, reliability, service continuity, and flexible VM deployment. Technologies such as M-LAG improve gateway and uplink redundancy and support fast failover, while VXLAN enables large-scale Layer 2 extension for VM mobility and resource flexibility.
Option C is also true because intelligent computing networks, especially those serving AI training and distributed GPU clusters, require an extremely low-loss or lossless forwarding environment.
Technologies such as PFC and ECN are standard methods used to build such networks and reduce congestion-related packet loss.


NEW QUESTION # 83
On a small WLAN shown in the figure, the WAC acts as a DHCP server to assign IP addresses to APs and STAs. The management VLAN is 100, the service VLAN is 110, and the user data forwarding mode is tunnel forwarding. Which of the following is the correct configuration for the switch and WAC interfaces?

Answer: B

Explanation:
In tunnel forwarding mode, user traffic is encapsulated and carried to the WAC, so the switch-AP and WAC-switch links mainly need to carry the management VLAN for AP registration and control communication. Since VLAN 100 is the management VLAN, both the switch ports and WAC interface only need to allow VLAN 100, without requiring the service VLAN 110 on the wired transport links.


NEW QUESTION # 84
If host A wants to communicate with host B, which is on another subnet, host A broadcasts an ARP request to obtain host B ' s MAC address. After receiving the request, host B replies with an ARP response to notify host A of its MAC address.

Answer: A

Explanation:
ARP resolves an IPv4 address to a Layer 2 MAC address only within the local broadcast domain. When Host A determines, from its IP address and subnet mask, that Host B is on a different subnet, Host A does not broadcast an ARP request for Host B ' s MAC address. Instead, it forwards the packet to its default gateway.
If the gateway ' s MAC address is not already cached, Host A broadcasts an ARP request for the gateway interface ' s IPv4 address. The gateway replies with its own MAC address, and Host A uses that MAC address as the Ethernet destination while retaining Host B ' s IP address as the IP destination. The router then forwards the packet toward Host B and may perform ARP on the destination subnet to learn Host B ' s MAC address.
Therefore, the statement incorrectly describes cross-subnet forwarding as direct ARP resolution between the two hosts. The correct answer is FALSE, option B.


NEW QUESTION # 85
......

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