H12-891_V1.0 Exam Dumps - Huawei HCIE-Datacom Questions and Answers

Comprehensive and Detailed In-Depth Explanation:

A. When planning paths based on bandwidth:Correct. The available bandwidth of each interface must beset in advanceto allow path planning based on bandwidth requirements.

B. When planning paths based on delay:Correct. To plan paths considering delay, you need to deployTWAMP (Two-Way Active Measurement Protocol)oriFIT (Intelligent Flow Information Telemetry)to measure thereal-time delayon network links.

C. If the controller plans SR-MPLS Policy paths:Incorrect. The controller can planprimary, backup, and load-balanced paths, enablingtraffic distribution across multiple paths.

D. Statically planned SR-MPLS Policy paths:Correct. You canmanually configure load balancingfor the primary path when planning the SR-MPLS Policy path statically.

Comprehensive and Detailed Explanation:

✔Portal authenticationis aweb-based authentication mechanismused in campus networks tocontrol user access.

✔Correct Statements:

✅(A)ThePortal server exchanges authentication detailswith the access device, which forwards them to the authentication server.

✅(D)When usingHTTP/HTTPS authentication, the client must send authentication credentials to theaccess device, which then forwards them to the authentication server.

✔Incorrect Statements:

❌(B)HTTP/HTTPS support ismandatoryfor web-based authentication.

❌(C)If HTTP/HTTPS is used,Portal authentication may still be required.

????Reference:Huawei HCIE Datacom – Portal Authentication Mechanism

????Analyze the Configuration:

[R2] acl 2000

[R2-acl-basic-2000] rule deny

[R2] ospf

[R2-ospf-1] area 1

[R2-ospf-1-area-0.0.0.1] filter 2000 import

[R2-ospf-1-area-0.0.0.1] quit

[R2-ospf-1] default-route-advertise always

????Understanding Key Concepts:

Type 3 LSAs (Inter-Area Routes):

Generated by ABRs to advertisesummary routesbetween areas.

Filtering Type 3 LSAsis possible using import filters (like in Area 1).

Type 5 LSAs (External Routes):

Flooded only within the same ASbutdo not enter stub or NSSA areas.

✅Breakdown of the Options:

A. Type 5 LSAs are flooded in Area 1→❌Incorrect

If Area 1 is astub or NSSA, thenType 5 LSAs are not allowed.

Although the diagram does not explicitly say Area 1 is a stub/NSSA,real deployments often use stub areas at the edge (like Area 1).

More importantly,the filter is applied to Area 1, and there isno redistributionof external routes into Area 1 in the config.

Therefore, Type 5 LSAs wouldnot be floodedthere.

B. Type 3 LSAs are not flooded in Area 1→✅Correct

The command filter 2000 import with ACL rule deny meansType 3 LSAs are filtered from Area 0 into Area 1.

C. Type 3 LSAs are not flooded in Area 2→✅Correct

There isno filter applied to Area 2, so thiscould be false,butsince the question asks for the incorrect statement, this is not the answer.

D. Type 5 LSAs are flooded in Area 2→✅Correct

Area 2 is not shown to be stub or NSSA, and there’s no filter or restriction configured.

Hence,Type 5 LSAs are allowedandflooded in Area 2.

✅Correct Answer: A. Type 5 LSAs are flooded in Area 1.

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.

There arethree standard inter-AS MPLS VPN options, as per RFC 4364:

Option A (Back-to-Back VRF):

VRFs are directly connected between ASBRs using routing exchange (like static/BGP).

No label switching between ASs —no MPLS label neededbetween ASs.

Option B (EBGP Label Exchange):

ASBRs exchange labeled VPNv4 routes via EBGP.

One MPLS label is required —MPLS forwarding across AS boundaryis used.

Option C (End-to-End LSP):

Full end-to-end LSP is created across ASs.

MPLS labels are definitely usedend-to-end, even between ASs.

Option D (Commonly vendor-specific extensions based on Option B/C):

Similar to Option C —requires MPLS labels.

So:

B. Option B— needs MPLS label✅

D. Option D— also needs MPLS label✅

A. Option A—no MPLS label❌

C. Option C— also uses MPLS label✅, but not listed as an answer option in this question format (should have been).

Assuming valid options areA, B, D, the correct ones needing MPLS labels are:

Correct answers: B, D

Comprehensive and Detailed In-Depth Explanation:

When configuring avirtualized campus networkoniMaster NCE-Campus, the platform supports automatic delivery of routing policies when connecting to external networks, including the Internet.

This feature ensures that traffic destined for external networks isautomatically directed to the appropriate egress points.

TheNCE-Campusautomatically creates and delivers thedefault routeor specific routes, depending on the network topology and configuration.

This simplifies network management by eliminating the need for manual route configuration on each device.

Therefore, the statement isTRUE.

Comprehensive and Detailed In-Depth Explanation:

WhenIS-ISis used as theIGP (Interior Gateway Protocol)to advertiseSegment Routing (SR) SIDs, theLevel-2 (L2) routeradvertisesnode SIDs globally across the entire IS-IS domain, not just within a single area.

Level-1 (L1) routersonly advertise within the local area, butL2 routersdistribute information across multiple areas, enabling inter-area reachability.

Therefore, the statement isFALSE.

InOSPFv3,Link-LSA (Type 8)is generated by a routerfor each of its interfacesto advertise:

Therouter's link-local addresson that interface.

TheIPv6 prefixesassociated with the interface.

Flags and options, such as router priority or loopback indicators.

From the output:

Link-LSA (Interface GigabitEthernet0/0/0)

Originating Router: 10.1.2.2

Link-Local Address: FE80::2E0:FCFF:FECD:4F79

Prefix: 2001:DB8:2345:23::/64

A. The link-local address of R2’s GE0/0/0 is FE80::2E0:FCFF:FECD:4F79→ This matches the Link-Local Address field in the LSA.✅

B. The IPv6 address prefix of R2’s GE0/0/0 is 2001:DB8:2345:23::/64→ This matches the Prefix field in the LSA.✅

C. This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation→❌Incorrect.

TheLink-LSAdoesnot provide any indicationabout external route capabilities.

It simply advertisesinterface-specific IPv6 and link-local info.

Whether R2 supports external routes depends onType 5 (External) or Type 7 (NSSA) LSAs, not Link-LSAs.

D. This LSA is generated by R2→ The Originating Router: 10.1.2.2 is R2’s router ID, so this LSA is definitely generated by R2.✅

Correct Answers:A, B, D

The Link-LSA in OSPFv3 contains:

The link-local address used by the originating router on the link.

A list of all IPv6 prefixes associated with the link.

Flags such as router priority and the Router-LSA options.

These LSAs are alwaysgenerated by the router itselfand arenot flooded beyond the link.

Understanding the Network Scenario:

R2 is the boundary router between OSPF and IS-IS.

OSPF and IS-IS do not automatically redistribute routes between each other.

R4's loopback (10.1.4.4/32) exists in the IS-IS domain.

To allow R1 (OSPF) to reach R4’s loopback, R2 must redistribute IS-IS routes into OSPF.

Why Option C Is Correct (✅)

✔default-route-advertise in OSPF on R2:

This advertises a default route into the OSPF domain, allowing OSPF routers (R1, R3) to forward unknown traffic to R2.

Since IS-IS routes are not automatically injected into OSPF, this ensures R1 can reach R4.

✔IS-IS Already Has Routes to OSPF

IS-IS routers (R3, R4) already learn routes from OSPF via R2 (assuming route redistribution is properly configured).

No need to run default-route-advertise in IS-IS.

Why Other Options Are Incorrect (❌)

❌A. Run default-route-advertise in both OSPF and IS-IS views on R2

Unnecessary in IS-IS. The IS-IS domain already learns OSPF routes from R2 via redistribution.

Only OSPF needs a default route to forward unknown traffic to R2.

❌B. No configuration is required

Incorrect, because OSPF does not automatically learn IS-IS routes.

A default route or redistribution is needed for R1 to reach R4.

❌D. Run default-route-advertise only in the IS-IS view on R2

Incorrect, because IS-IS already has routing information from OSPF.

The issue is with OSPF not learning IS-IS routes, so the command needs to be in OSPF view.

????Reference:Huawei HCIE Datacom – OSPF and IS-IS Route Redistribution and Interoperability

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Comprehensive and Detailed In-Depth Explanation:

1. Portal Authentication:

Scenario:Guests who move frequently and use different types of terminals.

Portal authentication (also known as Web authentication) is commonly used in environments like Wi-Fi hotspots, hotels, and public areas.

Users are redirected to a login page where they enter credentials.

This method is flexible for guests and visitors who may frequently change locations or devices.

Use Case:Wi-Fi access for guests in a corporate environment.

2. MAC Address Authentication:

Scenario:Dumb terminals such as printers and fax machines.

MAC address authentication is useful for devices that do not support interactive authentication methods (like printers or IP phones).

It authenticates devices based on theirMAC addresswithout user intervention.

This method is suitable for static, non-user devices that are typically part of the local network.

Use Case:Ensuring that only authorized printers or IP phones connect to the network.

3. 802.1X Authentication:

Scenario:Office users in scenarios demanding high security.

802.1X is aport-based network access control protocolthat authenticates users before allowing network access.

Typically used in wired or wireless LAN environments where high security is required.

It usesEAP (Extensible Authentication Protocol)methods and integrates with RADIUS servers.

Use Case:Corporate LAN environments with stringent security policies.