H12-821_V1.0 Exam Dumps - HCIP-Datacom-Core Technology V1.0

Comprehensive and Detailed Step-by-Step Explanation:

Switch Stack Overview:

In a switch stack, roles are assigned asmaster,standby, andslave.

The master handles configuration and control, while the standby serves as the backup master.

Behavior During Master Restart:

D:If the master switch restarts, the standby switch immediately takes over as the new master.

B:After the original master switch restarts, it becomes the master again (default behavior).

Incorrect Options:

A:The slave switch is not promoted to standby before the master switch restart completes.

C:The original standby switch remains the master after the restart.

Understanding the LSDB and Level-2 DIS Election in IS-IS:

In IS-IS, theDesignated Intermediate System (DIS)is elected for both Level-1 and Level-2 on broadcast networks to manage the link-state database (LSDB) and reduce the number of LSAs exchanged.

The election of the DIS is based on thehighest priority. If the priority is the same, the router with thehighest System IDbecomes the DIS.

HCIP-Datacom-Core Technology Training Material (IS-IS DIS Election)​​.

Analyzing the LSDB:

From the LSDB ofR1, the Level-2 link-state database includes the following entries:

LSPID 0100.0000.3003.00-00: This is R3, and it is present in the Level-2 LSDB with the sequence number and checksum details.

Other routers (R1, R2, R4) are present but do not have the characteristics of the Level-2 DIS in this topology.

Based on the System IDs,R3 (0100.0000.3003)has the highest System ID, making it theLevel-2 DIS.

Conclusion:

The Level-2 DIS on the network isR3, based on the election rules and the LSDB information shown in the figure.

Let’s analyze the process step-by-step:

R1redistributes thedirect route 10.1.1.0/24intoOSPF.

This OSPF route reachesR2andR3.

R2 and R3 are in an environment that usesIS-IStowardsR4.

BothR2 and R3 re-advertisethis OSPF route into IS-IS toward R4 (bidirectional route redistribution).

OnR3, aroute-policy named hcipis applied to controlASE (Autonomous System External) route preference.

The ACL matches the route10.1.1.0/24.

The route-policy sets thepreferenceof this ASE route to14.

InHuawei VRP, if a route-policy applied via preference ase route-policy matches a route, itmodifies the preferencevalue of the redistributed route when it is advertised.

By default:

OSPF ASE routeshave apreference of 150.

But in this case, due to the policy applied, the preference is explicitly changed to14on R3 before re-advertising to R4.

So,R4will install the route10.1.1.0/24from R3 withpreference 14, assuming R2 doesn’t provide a better preference.

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

“You can control the preference of OSPF ASE routes by using a route-policy and applying it with the command preference ase route-policy. When the policy matches, the specified preference is used instead of the default (150).”

(Chapter: OSPF Advanced Features – Section: Route Control and Inter-AS Route Redistribution)

ï‚· MQC and PBR

MQC (Modular QoS Command-Line Interface): Applied to interfaces for classifying and controlling traffic.

PBR (Policy-Based Routing): Used to influence packet forwarding based on policies rather than traditional routing tables.

Both MQC and PBR can be configured on device interfaces to filter incoming/outgoing packets or control their forwarding paths.

ï‚· HCIP-Datacom-Core Reference

The use of MQC and PBR on device interfaces is elaborated in the QoS and routing control chapters​​.

Comprehensive and Detailed In-Depth Explanation:

IP Multicast vs. Broadcast:

A. TRUE→ Unlikebroadcast, which sends data toall hostsin a subnet,multicast only sends data to interested receivers,preventing flooding.

B. TRUE→Multicast optimizes bandwidth usageby sending asingle copy of data, which is thenreplicated at network routers only when necessary.

IP Multicast vs. Unicast:

C. FALSE→Multicast does not improve security; it may expose data to unintended receivers ifnot properly controlled.

D. FALSE→Multicast reduces the load on the sourcebecause asingle data stream serves multiple receiversinstead of sendingindividual unicast streams.

📖Reference:Huawei HCIA-Datacom Study Guide, IP Multicast Principles and Benefits.

Intra-area route calculation in OSPF involves only Router LSAs (Type 1) and Network LSAs (Type 2). Summary LSAs (Type 3) are used for inter-area routes and do not participate in intra-area route calculation. Therefore, the statement is false ​.

Comprehensive and Detailed Step-by-Step Explanation:

1. Understanding IGMP (Internet Group Management Protocol):

IGMP is used in multicast networking to manage membership of devices in multicast groups.

Key parameters in the configuration provided:

Interface IP Address:192.168.1.1

IGMP Version:2

Query Interval (Configured):60 seconds

Maximum Query Response Time:10 seconds

Querier Address:192.168.1.1

2. Analysis of Each Statement:

Option A: The IP address of the interface is 192.168.1.1.

Correct (True Statement).

The configuration clearly shows that the IP address of the interface is 192.168.1.1.

Option B: The maximum response time to Query messages is 10s.

Correct (True Statement).

The configuration explicitly mentions: Value of maximum query response time for IGMP: 10 s.

Option C: The interval for sending Group-Specific Query messages is 60s.

Incorrect (False Statement).

The 60-second value refers to thequery interval, which is the time interval betweengeneral queriessent by the querier.

The interval forgroup-specific queriesis not specified in this configuration. It is determined dynamically based on the multicast environment and is usually shorter than the general query interval.

Option D: The IGMP version is IGMPv2.

Correct (True Statement).

The configuration specifies: Current IGMP version is 2.

3. Why Option C is False:

The 60-second value is forgeneral query interval, not group-specific query interval.

The statement misinterprets the configuration, making itfalse.

4. Summary:

Correct Answer:C (The interval for sending Group-Specific Query messages is 60s).

When routes are imported into BGP using theimport-routecommand, the origin attribute is set toincompleteby default. This indicates that the route's origin is not known or is from an external source, as opposed to being explicitly learned through an IGP (IGP) or EGP (EGP) protocol ​.