H12-891_V1.0 Exam Dumps - HCIE-Datacom V1.0

Comprehensive and Detailed Explanation:

Thereset isis allcommand resets theentire IS-IS process, including:

✔Neighbor adjacencies

✔LSDB (Link-State Database)

✔All IS-IS-related statistics

Key Points:

This commandresets IS-IS completely, causingtemporary route convergence delays.

All IS-IS statistics are clearedbecause the process restarts from scratch.

Since the question states thatIS-IS statistics are not cleared, which is incorrect, the correct answer isFALSE.

📖Reference:Huawei HCIE Datacom – IS-IS Troubleshooting and Reset Commands

Understanding the Routing Table Entries on R4

0.0.0.0/0 (Default Route)is installedtwicein the routing table.

TheNextHopvalues for the default route:

10.1.24.1 (GigabitEthernet0/0/1)

10.1.34.1 (GigabitEthernet0/0/0)

Cost:Both routes have a metric (Cost) of10, meaning they areequal-cost routes.

Protocol:ISIS-L1 (Intermediate System to Intermediate System - Level 1) confirms these routes are coming fromIS-IS routing.

Flags:D (Dynamic) means these routes were dynamically learned via IS-IS.

Why is Option D Correct?

Since both routeshave the same cost (10), they are consideredequal-costdefault routes.

The routerwill use both routes in a load-sharingfashion.

The answeris NOT A(Four equal-cost routes) because there areonly twodefault routes, not four.

The answeris NOT B(One default route) because there aretwo default routesin the table.

The answeris NOT C(Two default routes with different costs) because both routes havethe same cost (10).

Real-World Application

Equal-Cost Multi-Path (ECMP):The router can performload balancingacross the two equal-cost paths.

Resilience & Redundancy:If one link fails, the other can take over without re-calculating the entire routing table.

✅Reference:Huawei HCIE-Datacom Study Guide – IS-IS Routing & ECMP Load Balancing

Comprehensive and Detailed Explanation:

Port isolationis a feature used to enhance security andnetwork segmentationby restricting communication between certain switch ports atLayer 2while allowing them to communicate throughLayer 3.

Layer 2 Communication:Devices within the same VLAN can communicate with an upstream gateway or router.

Layer 3 Isolation:Devices cannot communicatedirectlyat Layer 2 but must pass through a Layer 3 device (e.g., a router or firewall).

Use Case:Typically used in enterprise networks, hotel networks, and campus networks to preventunwanted direct communicationbetween clients.

Thus, the statement iscorrect, and the answer isTRUE.

📖Reference:Huawei HCIE Datacom Official Guide - Ethernet Port Isolation

GRE (Generic Routing Encapsulation)supports encapsulation of many protocol types:

SupportsIPv4 and IPv6 unicastencapsulation —✅

Doesnot support IPv6 broadcastencapsulation. GRE doesn’t natively handle multicast or broadcast IPv6 traffic well —❌

It is a lightweight tunneling protocol and relativelyeasy to deploy, placing minimal overhead on devices —✅

Correct answer: C. GRE can encapsulate IPv6 broadcast packets— is incorrect.

Understanding the Command Components:

This is aHuawei CLI commandused fordiagnosing connectivitywithin aVPN instancein an MPLS network.

ping -aX→ Specifies thesource IP address(X) of the ping packets.

-cY→ Specifies thenumber of ICMP Echo Request packetsto send (Y).

-sZ→ Defines thesize (in bytes) of each ICMP Echo Requestpacket (Z).

-vpn-instance M→ Specifies theVPN instance (VRF) Mto which the ping packets belong.

Why are all options correct?

✅A. The source IP address of the ping packets is X.

The -aX optionforces the ping to originate from IP Xinstead of the default interface IP.

✅B. The ping packets belong to VPN instance M.

The -vpn-instance M optionensures the ping is sent within VPN instance M, allowing verification ofMPLS L3VPN routing.

✅C. During the ping operation, the quantity of ICMP Request packets is Y.

The -cY parameter sets thenumber of ICMP Echo Requeststo be sent, making Y the total count.

✅D. The size of each ICMP Request packet for the ping operation is Z bytes.

The -sZ parameterdefines packet size, helping to testMTU (Maximum Transmission Unit)issues.

Real-World Application:

Verifying MPLS VPN connectivity:Ensure customer networks are reachable withinseparate VRFs.

Testing MTU & fragmentation:Using -sZ, operators can check ifpacket fragmentationoccurs.

Debugging asymmetric routing issues:By forcing -aX, engineers can trace return paths.

✅Reference:Huawei HCIE-Datacom Official Guide – MPLS VPN Troubleshooting & Ping Options

BGP EVPN Route Types in VXLAN:

BGP EVPN Type 2 Route (MAC/IP Advertisement Route)

Used forhost reachability advertisement.

Carries MAC and IP address information of endpoints.

Does not carry an IP Prefix field(Type 5 routes handle prefixes).

Correct Explanation of Answer Choices:✅IP Address (B) is included– Used for host mobility and reachability.✅L3VNI (C) is included– Used forLayer 3 VXLAN routing.✅L2VNI (D) is included– Used forLayer 2 VXLAN bridging.❌IP Prefix (A) is not included in Type 2 routes– It is part ofEVPN Type 5 routesforprefix advertisement.

Reference from Huawei HCIE-Datacom Documentation:

Huawei VXLAN BGP EVPN Configuration Guide – Type 2 vs. Type 5 Routes

HCIE-Datacom Training Material – VXLAN Overlay Networks and BGP EVPN

Node segments in SR-MPLS (Segment Routing over MPLS) are typically automatically generated and distributed via IGP protocols (such as IS-IS or OSPF) using SR extensions. There is no need to manually configure node segments on every router.

Exact Extract – Huawei HCIE-Datacom Study Guide – Segment Routing:

“Node SIDs are automatically generated and advertised by IGPs with SR extensions. Manual configuration is not required except in special cases like adjacency SIDs.”

OSPFv3 Configuration Principles:

OSPFv3, the OSPF version supporting IPv6, differs from OSPFv2 in several aspects:

Interface-based Configuration:

OSPFv3 is configured on interfaces directly, unlike OSPFv2 which uses the network command.

Router ID:

The Router ID is still a 32-bit number, typically represented as an IPv4 address.

It must be explicitly specified since OSPFv3 requires a Router ID for operation, even though it supports IPv6.

Analysis:

A. [R1-GigabitEthernet0/0/1] ospfv3 1 area 0:

Correct. This command enables OSPFv3 process 1 on the GE0/0/1 interface in Area 0.

B. [R1-ospfv3-1] router-id 10.1.1.1:

Correct. This correctly sets the Router ID for OSPFv3 process 1.

C. [R1-ospfv3-1-area-0.0.0.0] network 2001:DB8:2345:12::1 ::

Incorrect. OSPFv3 does not use the network command as in OSPFv2. Instead, OSPFv3 is directly configured on interfaces.

D. [R1] router id 10.1.1.1:

Incorrect. The Router ID should be set within the OSPFv3 process view, not the global configuration view.

Therefore, the correct answers are A and B.