Free Huawei H12-891_V1.0 Practice Exam with Questions & Answers

Intra-Area-Prefix-LSA (Type 9) is used in OSPFv3 to carry IPv6 prefix information for a router or network and is flooded within the area.

Link-LSA (Type 8) is only sent on the local link and is not flooded throughout the area.

Inter-Area-Prefix-LSA (Type 3) and Inter-Area-Router-LSA (Type 4) are also flooded within an area but originate from ABRs, typically for cross-area route advertisement.

That said, Intra-Area-Prefix-LSA is specifically flooded within an area, matching the context of the question directly.

Exact Extract - Huawei HCIE-Datacom OSPFv3 Module:

“Intra-Area-Prefix-LSAs are flooded within the area and advertise the IPv6 prefixes associated with router and network LSAs.”

Understanding DSCP & Assured Forwarding (AF) Classes

DSCP (Differentiated Services Code Point)is used forQoS (Quality of Service)classification inIP packet headers.

Assured Forwarding (AF) classesprovidefour traffic classes(AF1x, AF2x, AF3x, AF4x).

EachAF classhasthree drop precedence levels(Low = 1, Medium = 2, High = 3).

Analysis of Options:

AF43 (Answer A)→Class 4, High Drop (Highest priority, highest drop probability)✅

AF10 (Answer B)→Class 1, Low Drop (Lowest priority, lowest drop probability)❌

AF12 (Answer C)→Class 1, Medium Drop Probability❌

AF11 (Answer D)→Class 1, Low Drop Probability❌

Why AF43?

Highest priority traffic within AF Class 4.

Highest drop probability (x3)means packets aredropped firstunder congestion.

Used forpremium but non-essential services (e.g., bulk data transfer, backups).

✅Reference:Huawei HCIE-Datacom Guide – QoS & DSCP Marking

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In Huawei’sFree Mobility solution:

Authentication Point (AP): Identifies users and associates them with aSecurity Group Tag (SGT)upon access.

Policy Enforcement Point (PEP): Enforces policiesbetween different security groups, such as allowing or denying traffic.

Key points:

Ais correct — The PEP enforces inter-group access based on defined policies.

Bis incorrect — AP and PEPcan be on separate devices, offering deployment flexibility.

Cis incorrect — Thepolicy enforcementhappens at thePEP, not the AP. AP's job is to authenticate and tag traffic.

Dis correct — AP and PEP can be deployed ondifferent devices.

Correct answers: A, D

SSH (Secure Shell) is a protocol designed for secure remote access and is always built on TCP, typically on port 22. UDP is not supported for SSH, as it is connectionless and doesn't provide the required reliability and order.

Exact Extract – Huawei Security Protocol Fundamentals:

“SSH is a TCP-based protocol. It does not support UDP. TCP ensures session reliability and data integrity, which are critical for SSH.”

Error analysis:

The error SSLError and CertificateError indicates the server's SSL certificate'shostname doesn't match the IP addressbeing used in the request.

This happens when acertificate is issued for a domain (like devzone.huawei.com), but the client accesses it via an IP address (139.9.213.72), causing atrust failure.

Correct statements:

A—✅: The client doesn't trust the SSL certificate → correct.

B—✅: SSL verification fails due to hostname mismatch.

C—✅: Disabling verification with verify=False bypasses the check (only recommended in lab/testing environments).

D—❌: Uses http instead of https, which changes protocol and defeats the purpose of SSL. Also uses POST without API path.

Correct answers: A, B, C

Correct Matching of Authentication Methods:

1️802.1X authentication→PC (GE0/0/2 on SW3)

2️MAC address authentication→IP Phone (GE0/0/3 on SW3)

3️⃣Portal authentication→Wireless Clients (Connected via SW2/AP)

Understanding Network Admission Control (NAC) Authentication Methods

????Network Admission Control (NAC)enforcessecurity policies before allowing devices onto the network.

????Different types of devices requiredifferent authentication methodsbased oncapabilities and security requirements.

Analysis of Each Authentication Type:

✅1️⃣802.1X Authentication (Used for PC on GE0/0/2 of SW3)

Best for devices that support user authentication (e.g., PCs, Laptops).

Requiressupplicant software (e.g., Windows or macOS built-in 802.1X client).

Providesstrong security using EAP (Extensible Authentication Protocol) over RADIUS.

✅2️⃣MAC Address Authentication (Used for IP Phone on GE0/0/3 of SW3)

Best for devices that do not support username/password authentication (e.g., IP Phones, IoT devices).

UsesMAC addresses as identity credentials.

Suitable forVoIP networks, industrial IoT, and surveillance cameras.

✅3️⃣Portal Authentication (Used for Wireless Clients on SW2/AP)

Best for guests or mobile users accessing Wi-Fi networks.

Redirects users to aweb-based login pagebefore granting access.

Used inpublic hotspots, campus Wi-Fi, and enterprise guest networks.

Why These Assignments Are Correct?

1️⃣802.1X for PC:

PCs support 802.1X authentication via supplicants (EAP-MD5, PEAP, etc.).

Ensureshigh security by verifying user credentials.

2️⃣MAC Address Authentication for IP Phone:

IP Phones lack a username/password interface, so authentication is done via MAC addresses.

Simplifies authentication while maintaining security.

3️⃣Portal Authentication for Wireless Clients:

Wireless users do not use 802.1X authentication directly; instead, they are redirected to a web login page.

Common in enterprise guest Wi-Fi and public hotspots.

Real-World Application:

Enterprise NAC Deployment:Ensuresonly authorized users and devices access the corporate network.

Campus & Hotel Wi-Fi Security:UsesPortal Authentication for guests, 802.1X for employees, and MAC-based for VoIP.

✅Reference:Huawei HCIE-Datacom Guide – NAC Authentication Methods & Best Practices

Huawei Open Programmability System (OPS) is a programmable network architecture that uses RESTful APIs. In RESTful operations:

GET → Retrieve data

PUT → Configure/replace the value of a managed object

POST → Create new resources or perform non-idempotent operations

PATCH → Partially update a resource

When configuring or updating the value of a managed object (fully replacing it), PUT is the correct method.

Exact Extract – Huawei OPS and RESTful API Guide:

“The PUT method is used to configure the value of a managed object, replacing the entire object if it exists.”

DiffServ QoS model operates on per-hop behavior (PHB) and has these limitations:

A. ✅ Single-hop behavior; no end-to-end path awareness.

B. ✅ Cannot guarantee dedicated resources to individual users.

C. ✅ Does not address traffic bursts; congestion is still possible.

D. ✅ Queue limitations hinder fine-grained SLA assurance and deterministic delay.

Exact Extract – HCIE-Datacom QoS Section:

“DiffServ provides PHB without path-level control. It cannot guarantee SLA for individual users due to limited queuing mechanisms and lack of end-to-end visibility.”

Huawei Open Programmability System (OPS) and HTTP Request Headers

HuaweiOPSallowsnetwork automation and programmabilitythroughHTTP-based APIs. When using Python scripts to sendHTTP requests to network devices, the requestheaders must specify the content formatfor data exchange.

✅B. Content-Type: text/json, Accept: text/json (Correct Answer)

Content-Type: text/json→ Specifies that the request bodycontains JSON-formatted data.

Accept: text/json→ Specifies that theresponse should be in JSON format.