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Huawei H12-821_V1.0 Exam (page: 9)
Huawei HCIP-Datacom-Core Technology V1.0
Updated on: 15-Feb-2026

Viewing Page 9 of 45
H12-821_V1.0 PDF 399 Questions

Without a prior version check, an engineer configures IGMP snooping on a device and the version of

IGMP snooping is earlier than the IGMP versions on user hosts. In this case, which of the following situations will occur?

  1. Users cannot receive multicast data because the device forwards received IGMP Report messages only to router ports and does not generate group member ports or forwarding entries.
  2. Users cannot receive multicast data, but the device generates forwarding entries after receiving IGMP Report messages.
  3. The IGMP snooping version of the device is automatically degraded, and users can receive multicast data properly.
  4. The IGMP versions of the hosts are automatically upgraded, and users can receive multicast data properly.

Answer(s): A

Explanation:

IGMP Version Mismatch

If the IGMP snooping version on the device is earlier than the IGMP version on user hosts, the device may fail to parse IGMP Report messages correctly. As a result, the device forwards these messages only to router ports without generating group member ports or forwarding entries.

Consequently, users cannot receive multicast data.

HCIP-Datacom-Core Reference

Multicast and IGMP snooping behaviors under mismatched conditions are described in the multicast configuration chapters.



The Neighbor Discovery Protocol (NDP) is an important basic protocol in the IPv6 protocol suite and plays an important role.
Which of the following functions and features does it support?

  1. Address resolution
  2. Neighbor state tracing
  3. Duplicate address detection
  4. Redirection

Answer(s): A,C,D

Explanation:

Neighbor Discovery Protocol (NDP):

NDP is a key protocol in the IPv6 protocol suite, replacing ARP (Address Resolution Protocol) in IPv4.

It operates using ICMPv6 (Internet Control Message Protocol for IPv6) and is critical for managing interactions between IPv6 nodes on the same link.


Reference:

HCIP-Datacom-Core Technology Training Material (NDP Functions and Features).

NDP Features and Functions:

A . Address resolution:
NDP resolves IPv6 addresses into MAC addresses, similar to ARP in IPv4. It uses Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages for this purpose.

HCIP-Datacom-Core Technology Training Material (Address Resolution in IPv6).

B . Neighbor state tracing:
NDP tracks the state of neighbors to determine their reachability. It maintains a neighbor cache and uses NS/NA messages to verify whether neighbors are reachable.

HCIP-Datacom-Core Technology Training Material (Neighbor Reachability in IPv6).

C . Duplicate address detection (DAD):
NDP ensures that IPv6 addresses are unique within a network. Before assigning an address to an interface, DAD is used to verify that no other node is using the same address. This is done via NS messages.


HCIP-Datacom-Core Technology Training Material (IPv6 Address Assignment and DAD).

D . Redirection:
NDP provides redirection functionality to inform hosts of a better first-hop router for reaching a particular destination. It uses ICMPv6 Redirect messages for this purpose.

HCIP-Datacom-Core Technology Training Material (NDP Redirect Functionality).

Conclusion:
NDP supports all the mentioned functions and features: Address resolution, Neighbor state tracing, Duplicate address detection, and Redirection, making it indispensable for IPv6 networks.



IPv6 defines multiple types of addresses.
Which of the following statements is false about these addresses?

  1. Link-local addresses can be quickly generated using the EUI-64 method.
  2. Anycast addresses can be used only as destination addresses.
  3. Each interface can have multiple global unicast addresses with different network prefixes.
  4. Manually configured link-local addresses have a higher priority than automatically generated ones.

Answer(s): D

Explanation:

IPv6 Address Behavior

Manually configured link-local addresses do not have a higher priority than automatically generated ones; they coexist and are equally preferred for local communication.

The other statements are true:

A . Link-local addresses can use the EUI-64 method for quick generation.

B . Anycast addresses are only used as destination addresses.

C . An interface can have multiple global unicast addresses with different prefixes.

HCIP-Datacom-Core Reference

IPv6 address types and priority behaviors are detailed in the IPv6 addressing sections.



There are various types of VPNs, which can be applied to different layers.
Which of the following network layers does SSL VPN belong to?

  1. Network layer
  2. Application layer
  3. Transport layer
  4. Data link layer

Answer(s): B

Explanation:

SSL VPN and Its Functionality:

SSL VPN (Secure Sockets Layer Virtual Private Network) provides secure remote access to a network using SSL/TLS protocols.

SSL VPN operates at the Application Layer of the OSI model. It enables secure communication for applications like web browsers, email clients, and file sharing.

Unlike IPsec VPN, which operates at the Network Layer, SSL VPN focuses on application-specific encryption and authentication.


Reference:

HCIP-Security Training Material (VPN Basics and SSL VPN Configuration).



GRE is a VPN encapsulation technology that is widely used to transmit packets across heterogeneous networks.
Which of the following statements is false about GRE?

  1. GRE supports encryption and authentication.
  2. GRE supports multicast transmission.
  3. GRE is a Layer 3 VPN encapsulation technology.
  4. GRE can work with other VPN protocols to better ensure data security.

Answer(s): A

Explanation:

GRE Characteristics

GRE does not inherently support encryption or authentication. It is a tunneling protocol for encapsulating packets, and data security features must be implemented using other protocols such as IPsec.

Other correct attributes of GRE include:

B . Supports multicast transmission.

C . Acts as a Layer 3 VPN encapsulation technology.

D . Can work with VPN protocols like IPsec for better security.

HCIP-Datacom-Core Reference

GRE features and limitations are discussed in VPN encapsulation technology chapters.



Viewing Page 9 of 45



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