HUAWEI H12-821_V1.0 EXAM GUIDE MATERIALS - PRACTICE H12-821_V1.0 EXAM ONLINE

Huawei H12-821_V1.0 Exam Guide Materials - Practice H12-821_V1.0 Exam Online

Huawei H12-821_V1.0 Exam Guide Materials - Practice H12-821_V1.0 Exam Online

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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q24-Q29):

NEW QUESTION # 24
An enterprise network runs OSPF to implement network communication. Which of the following types of LSAs may be generated by an ABR?

  • A. AS External LSA
  • B. Network Summary LSA
  • C. ASBR Summary LSA
  • D. NSSA LSA

Answer: B,C,D

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:An Area Border Router (ABR) is an OSPF router that connects multiple areas, including the backbone area (Area 0). It plays a critical role in summarizing and propagating routing information between areas. The types of LSAs that an ABR can generate include:
* Network Summary LSA (Type 3):
* ABRs generate Type 3 LSAs to summarize and propagate routes from one area into another.
* For example, an ABR generates a Type 3 LSA to inform other areas about the networks in the area it is connected to.
* ASBR Summary LSA (Type 4):
* If an ASBR exists in one of the OSPF areas connected to the ABR, the ABR generates Type 4 LSAs.
* These LSAs provide information about how to reach the ASBR.
* NSSA LSA (Type 7):
* If the ABR is connected to a Not-So-Stubby Area (NSSA), it can generate Type 7 LSAs.
* These LSAs are used to describe external routes imported into the NSSA.
* AS External LSA (Type 5):
* These LSAs are not typically generated by an ABR unless the ABR is also functioning as an ASBR. Type 5 LSAs are used to describe external routes imported into OSPF from other autonomous systems.
Therefore, NSSA LSA (A), Network Summary LSA (C), and ASBR Summary LSA (D) are valid answers.
AS External LSA (B) would only be correct if the ABR were also functioning as an ASBR, but that is not explicitly stated in the question.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "OSPF LSAs and ABR Functions".
* RFC 2328 - OSPF Version 2.


NEW QUESTION # 25
Roaming technology is typically used on a large WLAN to ensure that STA (station) services are not interrupted when STAs move between coverage areas of different APs.

  • A. TRUE
  • B. FALSE

Answer: A

Explanation:
Comprehensive and Detailed In-Depth Explanation:
* Wireless LAN (WLAN) roaming allows mobile devices (STAs) to move seamlessly between different APs without dropping connections.
* Types of WLAN Roaming:
* Layer 2 roaming # STAs move between APs in the same subnet without IP address changes.
* Layer 3 roaming # STAs move across different subnets, requiring IP address reconfiguration (handled via DHCP or tunneling).
* Since roaming prevents service interruption in large WLAN deployments, the statement is true.
# Reference: Huawei HCIA-Datacom Study Guide, WLAN Roaming and Seamless Connectivity.


NEW QUESTION # 26
VRF, also called VPN instance, is a network virtualization technology that helps VPN technology to isolate users. In normal cases, multiple VPN instances can be created on a physical device, and each VPN instance has independent entries. Which of the following resources can be independently owned by a VPN instance?

  • A. Routing protocol process
  • B. MAC address table
  • C. Routing table
  • D. Interface

Answer: A,C,D

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. What is VRF (Virtual Routing and Forwarding)?
VRF is a network virtualization technology that enables multiple isolated routing tables to coexist on a single physical device.
Each VRF instance is independent, which ensures separation between different VPNs or users.
2. Resources That VRF Can Independently Own:
Option A: Interface
Correct.
Each VRF instance can have its own set of interfaces. These interfaces are bound to a specific VRF, isolating traffic at the physical or logical port level.
Option B: Routing table
Correct.
VRF instances maintain independent routing tables. This ensures that routes for one VPN do not overlap or interfere with routes of another VPN.
Option C: MAC address table
Incorrect.
The MAC address table is part of Layer 2 operations and is shared by all VRF instances on the device. VRF operates at Layer 3 and does not isolate MAC address tables.
Option D: Routing protocol process
Correct.
Each VRF instance can run its own routing protocol processes (e.g., OSPF, BGP), and these processes are completely independent of other VRF instances.
3. Summary:
The correct resources that can be independently owned by a VRF instance areInterface,Routing Table, andRouting Protocol Process.
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "VPN and VRF Concepts."


NEW QUESTION # 27
On a broadcast IS-IS network shown in the following figure, a DIS needs to be elected to create and update pseudonodes.
Which of the following routers is elected as the DIS?

  • A. R4
  • B. R3
  • C. R1
  • D. R2

Answer: B

Explanation:
Understanding DIS Election in IS-IS:
On an IS-IS broadcast network, aDesignated Intermediate System (DIS)is elected to create and update pseudonodes for efficient communication.
The election is based on the following criteria:
DIS Priority:The router with the highest priority is elected as the DIS.
Router ID (tie-breaker):If priorities are equal, the router with the highest Router ID is elected.
Analyzing the DIS Priorities and Router IDs:
R1: Priority = 64, Router ID = 1.1.1.1
R2: Priority = 1, Router ID = 2.2.2.2
R3: Priority = 127, Router ID = 3.3.3.3
R4: Priority = 10, Router ID = 4.4.4.4
Among the routers,R3 has the highest DIS priority (127), making it the DIS.
Correct Option:
Option B (R3):Correct, as R3 has the highest priority.
Option A (R1):Incorrect, as its priority is lower (64).
Option C (R4):Incorrect, as its priority is lower (10).
Option D (R2):Incorrect, as its priority is the lowest (1).
References:
HCIA-Datacom Study Guide, Chapter: IS-IS DIS Election
Huawei IS-IS Configuration and DIS Role Details


NEW QUESTION # 28
As shown in the figure, VRRP is associated with a BFD session. When a backup device detects a fault through BFD, the backup device immediately assumes the master role after the Master_Down_Timer timer expires.

  • A. FALSE
  • B. TRUE

Answer: A

Explanation:
VRRP and BFD Association:
VRRP (Virtual Router Redundancy Protocol) is used to provide gateway redundancy by electing amasterandbackuprouter.
Associating VRRP with BFD (Bidirectional Forwarding Detection) allows faster detection of faults on the master device or the link between the master and the backup.
HCIP-Datacom-Core Technology Training Material (VRRP and BFD Association).
Master_Down_Timer Behavior:
Normally, when a VRRP backup device detects that the master is down (through missed VRRP advertisements), theMaster_Down_Timerdictates the failover timing.
However, when VRRP is associated with BFD:
BFD detects faults immediately (sub-second detection).
The backup device doesnot wait for the Master_Down_Timerto expire. Instead, it immediately assumes the master role upon fault detection by BFD.
Reference:HCIP-Datacom-Core Technology Training Material (VRRP Failover Mechanism).
Why the Statement is FALSE:
The statement claims that the backup device assumes the master roleafter the Master_Down_Timer expireswhen a fault is detected by BFD.
This is incorrect because BFD bypasses the need for the Master_Down_Timer to expire. The backup device transitions to the master role immediately upon BFD detecting a fault.
Conclusion:
The correct behavior of VRRP when associated with BFD isimmediate role assumption by the backup deviceupon fault detection, bypassing the Master_Down_Timer.
Therefore, the statement isFALSE.


NEW QUESTION # 29
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