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

Comprehensive and Detailed Explanation:

✔Paramikois a Python library that providesSSH and SFTPfunctionality.

✔The SFTPClient classis specifically designed forSFTP (Secure File Transfer Protocol)operations.

✔How It Works:

ATransport sessionis established using Transport().

AnSFTP sessionis created using SFTPClient.from_transport().

File operations(upload/download) are performed viaSFTP methods.

✔Why Not Other Options?

❌(A) Packetizer class→ Handleslow-level SSH message processing, not SFTP.

❌(C) Channel class→ CreatesSSH channels, not SFTP sessions.

❌(D) Transport class→ EstablishesSSH connections, butdoes not perform file operations.

????Reference:Huawei HCIE Datacom – Python Paramiko and SFTP Implementation

Huawei iMaster NCE-CampusWi-Fi Location-Based Services (LBS)useHTTP/HTTPSto send location data (such as AP association, signal strength, timestamp, etc.) to an externalLBS platform.

Thestandard format for such data exchange is JSON (JavaScript Object Notation).

JSON is lightweight, readable, and widely supported by modern web APIs and platforms.

Other options:

XML: Used in legacy systems, heavier format.

HTML: Used for page rendering, not data transfer.

YAML: Used mainly in configurations, not standard for HTTP APIs.

Correct answer: C. JSON

Understanding User Authentication Points in a Network

Authentication pointscan be deployed at different network layersbased on security and scalability needs:

✅Access Layer Authentication:

Ensureshigh security & granular control(user-level authentication).

Preferred inhigh-security enterprise networks.

✅Aggregation or Core Layer Authentication:

Reduces authentication overheadbutprovides less granular control.

Suitable forlarge-scale networkswhere authentication load needs to be balanced.

Analysis of the Answer Choices:

✅A. Deploying user authentication points at the access layer achieves granular permission management and high network security.

Correct:Providesfine-grained control per userand prevents unauthorized access.

✅B. Moving user authentication points from the access layer to the aggregation or core layer greatly reduces the number of user authentication points, thereby effectively mitigating the pressure on the AAA server.

Correct:Fewer authentication points meanless load on the AAA server.

✅C. Deploying user authentication points at the access layer has both advantages and disadvantages when compared to doing so at the aggregation or core layer. Policy association can be applied if user authentication points are deployed at the access layer.

Correct:Policy-based authentication isbest applied at the access layerforgranular control.

❌D. When user authentication points are moved from the access layer to the aggregation layer, MAC address authentication for users may fail.

Incorrect:MAC authentication worksat both layers, butpolicy adjustmentsmay be needed.

✅Reference:Huawei HCIE-Datacom Guide – User Authentication Strategies in Enterprise Networks

Why is Free Mobility Not Based on VLANs or IP Addresses?

Free mobilityin Huawei CloudCampus implementspolicy-based user access controlbased onuser identity (rather than VLANs or IP addresses).

Users canmove across different network locationswhile maintaining their assignedsecurity and access policies.

✅How Free Mobility Works:

Policies are applied based onUser Groupsinstead of VLAN or IP.

UsesGroup-Based Policy Control (GBP)andSoftware-Defined Access (SDA)principles.

❌Incorrect Statement Explanation:

Traditional networks rely on VLANs and IP addresses for segmentation, butFree Mobility applies policies at the user level, allowing seamless access anywhere on the network.

Reference from Huawei HCIE-Datacom Documentation:

Huawei CloudCampus Solution Guide – Free Mobility and Policy Control

HCIE-Datacom Training Material – Identity-Based Networking

Understanding VXLAN and NVE Interfaces

VXLAN (Virtual Extensible LAN)allows forLayer 2 network extensionoverLayer 3 infrastructure.

????Key VXLAN Components:

NVE (Network Virtualization Edge) Interface→ VXLAN tunnels are created usingone or more NVE interfaces.

BD (Bridge Domain)→ Logical grouping of VXLAN traffic.

VNI (VXLAN Network Identifier)→ 24-bit unique ID for traffic segmentation.

????Analysis of Each Option:

✅A. One NVE interface can be used for multiple VXLAN tunnels if ingress replication is used.

Correct:VXLAN tunnels can be dynamically learned usingBGP EVPN, meaning multiple tunnels can use the sameNVE interface.

✅B. An NVE interface can be associated with multiple VNIs, allowing multiple BDs on one NVE.

Correct:Each NVE interface can carrymultiple VNIs, reducing the need for separate interfaces.

❌C. One NVE interface must be created per VXLAN tunnel.

Incorrect:Multiple VXLAN tunnelscan share a single NVE interface.

❌D. One NVE must be created for each BD.

Incorrect:One NVE can support multiple BDs.

????Real-World Application:

Cloud Data Centers:VXLAN enablesmulti-tenant network segmentation.

Campus Networks:SimplifiesLayer 2/Layer 3 connectivityacross sites.

✅Reference:Huawei HCIE-Datacom Guide – VXLAN and NVE Configuration

Comprehensive and Detailed Explanation:

✔Breakdown of the Python Code:

✅(A) Correct→ The function r.json() can be used to display theserver response (token details).

✅(B) Correct→ Thetoken request URLis correct.

✅(D) Correct→ The request body is inJSON format(json={"userName": nbi_name, "password": nbi_pwd"}).

❌(C) Incorrect→ The requestuses POST, not GET(requests.post() is explicitly called).

????Reference:Huawei HCIE Datacom – iMaster NCE RESTful API Authentication

In hot standby (active-active/load balancing) scenarios, Quick Session Backup is critical. This function ensures that session entries are immediately synchronized between firewalls to handle asymmetric traffic (where return traffic goes through a different firewall than the forward traffic).

Without it, the return packet may be dropped due to missing session information on the alternate firewall.

Exact Extract - HCIE-Datacom Security Module:

“When VGMP is in load balancing mode, quick session backup must be enabled to prevent traffic loss due to inconsistent forward and return paths.”

OSPF (Open Shortest Path First) Router-LSA (Type 1 LSA)describesall directly connected OSPF linksof a router and their types. Thefollowing link types can appear in a Router-LSA:

Point-to-Point (P-2-P) (B)– Represents adirect connection between two routers.

Virtual Link (Vlink) (C)– Used toconnect an area to the backbone (Area 0)when a direct connection is unavailable.

Stub Network (StubNet) (D)– Represents anetwork with only one exit point(e.g., a loopback interface or passive interface).

Incorrect Option:

TransNet (A) – Incorrect!

Transit networks appear in Network LSAs (Type 2), not Router LSAs.

Reference from Huawei HCIE-Datacom Documentation:

Huawei OSPF Configuration Guide – Router-LSAs and Link Types

HCIE-Datacom Training Material – OSPF LSAs and Topology Advertisement