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Pass the Huawei HCIP-Datacom H12-821_V1.0 Questions and answers with Dumpstech

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H12-821_V1.0 Questions and Answers

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Viewing questions 31-40 out of questions

Questions # 31:

In BGP, the MED attribute is transmitted only between two neighboring ASs. The AS that receives the MED attribute does not advertise it to a third AS. By default, a router compares only the MED values of BGP routes from the same neighboring AS. That is, if two routes to the same destination are from different neighboring ASs, the router does not compare the MED values of the two routes.

Options:

TRUE

FALSE

Answer

Questions # 32:

CPU attack defense uses a multi-level security mechanism to implement hierarchical device protection. Match the following levels with the corresponding protection functions.

Question # 32

Options:

Answer

Answer:

Questions # 33:

Which of the following statements about WLAN roaming are false?

Options:

APs with which a STA is associated before and after roaming can work on different channels.

During roaming, the STA sends a Reassociation Request frame containing home AP information to the foreign AP.

During roaming, the STA sends an Association Request frame containing home AP information to the foreign AP.

APs with which a STA is associated before and after roaming must work on the same channel.

Answer

C, D

Explanation

 During WLAN roaming, the STA sends a Reassociation Request frame to the foreign AP to maintain connectivity. Association frames are used during initial connections, not roaming.

 APs with which a STA is associated before and after roaming can work on different channels, as roaming often occurs across channels in environments like multi-SSID or multi-channel setups.

Options C and D are false, as they contradict standard WLAN roaming procedures .

Questions # 34:

ICMPv6 messages are classified as error or informational messages.

Options:

TRUE

FALSE

Answer

Explanation

ICMPv6 messages are classified into two types: error messages (e.g., Destination Unreachable, Time Exceeded) and informational messages (e.g., Echo Request, Echo Reply). This classification is fundamental to ICMPv6 ' s operation .

Questions # 35:

After VRRP election is complete, a device assumes the Master or Backup role. Which of the following events can be processed only by the device of the Master role?

Options:

Periodically send VRRP Advertisement packets.

Respond to the ARP request destined for the virtual IP address.

Respond to VRRP Advertisement packets with lower priorities.

Forward IP packets destined for a virtual MAC address.

Answer

A, B, D

Questions # 36:

On an IPv6 network, intermediate forwarding devices do not fragment IPv6 packets for the purpose of reducing their packet processing pressure. Packets are fragmented only on the source node.

Options:

TRUE

FALSE

Answer

Explanation

In IPv6 , fragmentation is handled only at the source node . Intermediate routers do not fragment packets . Instead, if a packet is too large for the next link, the router sends back an ICMPv6 Packet Too Big message to the source, which then adjusts its packet size.

This design:

Reduces processing load on intermediate devices.

Supports Path MTU Discovery (PMTUD).

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“In IPv6, routers do not perform fragmentation. Only the source device fragments packets if needed, based on ICMPv6 feedback.”

(Chapter: IPv6 Fundamentals – Section: Fragmentation and PMTUD)

Questions # 37:

ASBRs cannot exist in an OSPF stub area.

Options:

TRUE

FALSE

Answer

Explanation

Comprehensive and Detailed In-Depth Explanation:

Stub areas do not allow external routes (Type 5 LSAs).

Since ASBRs are responsible for redistributing external routes into OSPF, they cannot exist in a stub area .

If an ASBR were placed in a stub area, it would attempt to inject external routes into the OSPF domain, which contradicts the stub area rules.

To allow external routes, Not-So-Stubby Areas (NSSAs) are used instead, which allow ASBRs and use Type 7 LSAs to carry external routes.

???? Reference: Huawei HCIA-Datacom Study Guide, OSPF Area Types and ASBR Restrictions.

Questions # 38:

Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. R1 and R2 are connected through a PPP link, and R3 is the DIS. Which of the following statements are true?

Question # 38

Options:

If R2 sends a Level-2 LSP, R3 needs to send a PSNP for acknowledgment.

R3 periodically sends CSNPs to implement Level-2 LSDB synchronization.

R2 sends an LSP to R3 and R4 in unicast mode.

If R1 sends an LSP, R2 needs to send a PSNP for acknowledgment.

Answer

B, D

Explanation

 R3, as the DIS in the Level-2 domain, periodically sends Complete Sequence Number Protocol Data Units (CSNPs) to ensure LSDB synchronization among Level-2 routers.

 R1 and R2 are in a Level-1 domain, and IS-IS requires the receiving router (R2) to acknowledge an LSP from R1 by sending a Partial Sequence Number Protocol Data Unit (PSNP).

 IS-IS LSPs in a broadcast network are sent using multicast, not unicast, making option C incorrect.

 For Level-2 LSPs, acknowledgments are not provided using PSNP by R3; CSNPs are sufficient for synchronization .

Questions # 39:

As shown in the figure, the stateful inspection firewall forwards the packet because the packet matches the session status of the firewall.

Options:

TRUE

FALSE

Answer

Explanation

A stateful inspection firewall tracks the state of active connections. If a packet matches an existing session in the firewall ' s state table, it is allowed to pass. The diagram indicates that the TCP packet matches the session state, so the firewall forwards it .

Questions # 40:

If you do not take proper precautions when deploying a VRRP network, the network may be disconnected. Which of the following is not a precaution for deploying VRRP?

Options:

Configure the same VRID for switches in a VRRP group.

Do not manually set the virtual MAC address of a VRRP group.

When configuring a VRRP device to send ARP aging probe packets, set the source IP address to a virtual IP address.

Configure different virtual IP addresses for VRRP groups.

Answer

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