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Huawei H12-821_V1.0 Practice Test - Questions Answers, Page 5

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Question 41

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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?

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.

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.

Users cannot receive multicast data, but the device generates forwarding entries after receiving IGMP Report messages.

Users cannot receive multicast data, but the device generates forwarding entries after receiving IGMP Report messages.

The IGMP snooping version of the device is automatically degraded, and users can receive multicast data properly.

The IGMP snooping version of the device is automatically degraded, and users can receive multicast data properly.

The IGMP versions of the hosts are automatically upgraded, and users can receive multicast data properly.

The IGMP versions of the hosts are automatically upgraded, and users can receive multicast data properly.

Suggested answer: 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.

asked 02/12/2024
Vincent Meuldijk
46 questions

Question 42

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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?

Address resolution

Address resolution

Neighbor state tracing

Neighbor state tracing

Duplicate address detection

Duplicate address detection

Redirection

Redirection

Suggested answer: A, B, 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.

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.

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.

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.

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.

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.

asked 02/12/2024
Andre van Mierlo
46 questions

Question 43

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

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Question 44

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

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Question 45

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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?

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Question 46

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By default, some security zones are created when Huawei firewalls are enabled. Which of the following security zones is created by users?

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Question 47

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When receiving a packet that does not match any session table entry, the firewall discards the packet to prevent external attacks and ensure internal information security.

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Question 48

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GRE is a Layer 2 VPN encapsulation technology that encapsulates packets of certain data link layer protocols so that the encapsulated packets can be transmitted over an IP network.

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Question 49

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When multiple access channels are set for the same access requirement, the insecure access channels are not used and secure access channels are selected in normal cases. Which of the following are secure access channels?

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Question 50

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An enterprise administrator wants to configure single-hop BFD to implement fast detection of direct links. Which of the following configurations are mandatory?

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