Comprehensive and Detailed In-Depth Explanation:

OSPFv3, which supports IPv6, uses a router ID that is 32 bits in length, similar to OSPFv2. The router ID in OSPF is always a 32-bit number, typically represented in an IPv4 address format (dotted decimal). Although OSPFv3 is designed to support IPv6, it still relies on a 32-bit router ID for identification, which must be unique within an OSPF domain. The router ID does not change even though the protocol itself supports IPv6 addresses (128 bits).

Huawei SD-WAN establishes secure tunnels between SD-WAN edge devices (CPEs, AR routers, and controllers) using tunneling protocols.

✅ B. GRE over IPsec (Correct Answer)

GRE (Generic Routing Encapsulation) over IPsec is the primary tunneling method used in Huawei SD-WAN.

GRE provides multi-protocol encapsulation, while IPsec ensures encryption and security.

Used for secure communication over public WAN links (e.g., the internet, LTE, MPLS, etc.).

Portal Authentication vs. MAC Authentication

✅ Portal Authentication

Used in high-mobility environments (e.g., shopping malls, hotels, and public Wi-Fi hotspots).

Users authenticate via a web portal before gaining network access.

Supports multiple device types (smartphones, laptops, tablets, etc.).

✅ MAC Address Authentication

Used for dumb devices that cannot perform interactive authentication (e.g., printers, IP phones, cameras).

The network authenticates devices based on their MAC addresses automatically.

Often used in enterprise LANs to ensure unattended devices get network access securely.

Reference from Huawei HCIE-Datacom Documentation:

Huawei CloudCampus Authentication Guide – Portal and MAC Authentication

HCIE-Datacom Training Material – Access Control Mechanisms

The provided Python code uses the requests.post() function to make an HTTP POST request to retrieve a token from iMaster NCE. The body is structured using the json={} parameter, which serializes the dictionary into JSON format. The proper content-type and accept headers are included.

Let ' s analyze each option:

✅ Option A is correct: The print(r.json()) is a valid method to display JSON response from the server.

✅ Option B is correct: The token URL is constructed correctly: https://139.9.213.72:18002/controller/v2/tokens.

✅ Option C is correct: The request body is clearly in JSON format, specified by the json={...} argument.

❌ Option D is incorrect: The HTTP method used is POST, not GET. The statement is false, making it the correct answer to select.

Huawei Official Documentation Reference:

“To obtain a token, the client sends a POST request to /controller/v2/tokens, including credentials in the request body in JSON format.”

(Source: Huawei iMaster NCE RESTful API Reference Guide – Authentication Section)

NAFTIR (Network Address Flow Traffic Incoming Rate) policing is a traffic control mechanism that can only be applied to inbound traffic.

Purpose:

Monitors and limits the traffic entering a network device.

Prevents upstream devices from overloading the network with excessive data.

Key Fact: Outbound policing requires different mechanisms like QoS shaping or traffic scheduling.

✅ Reference: Huawei HCIE-Datacom Study Guide - Traffic Policing and Shaping

To automatically enable MPLS on an interface in SR-MPLS:

Segment routing must be enabled globally in the system view → ✅

Segment routing must also be enabled under the IGP process, and IGP (OSPF or IS-IS) must be enabled on the interface → ✅

Clarifications:

SRGB (Segment Routing Global Block) configuration defines SID ranges but does not trigger MPLS enablement → ❌

Static adjacency labels are advanced options and do not auto-enable MPLS → ❌

Correct answers: B, D

To configure an SR-MPLS TE tunnel based on OSPF, all four options are mandatory:

A. Configure the LSR ID – LSR ID is required as the unique identifier of the router in MPLS and TE.

B. Enable segment routing in the OSPF process view – Needed to advertise segment information (SID).

C. Enable the opaque capability – Opaque LSAs are used to carry SR and TE information in OSPF.

D. Enable MPLS TE in the OSPF process view – Ensures that TE-related attributes (e.g., bandwidth) are advertised in OSPF LSAs.

Exact Extract - Huawei HCIE-Datacom SR-MPLS TE Configuration Guide:

“To support SR-MPLS TE over OSPF, it is necessary to configure the LSR ID, enable SR and MPLS TE capabilities in OSPF, and activate the OSPF opaque capability for carrying TE and SR attributes.”

Analyzing the Routing Table Output:

The command display ipv6 routing-table protocol isis shows all IPv6 routes learned via IS-IS.

The output shows " Summary Count: 6 " , meaning R1 has six IS-IS IPv6 routes.

Explanation of Correct Answers:✅ A. R1 has six IS-IS IPv6 routes.

The " Summary Count: 6 " confirms that six IS-IS IPv6 routes exist in R1 ' s routing table.

✅ C. IS-IS IPv6 must have been enabled on GigabitEthernet0/0/1 of R1.

The interface GigabitEthernet0/0/1 is listed as the next-hop, meaning IS-IS IPv6 must be enabled on that interface.

✅ D. R1 is not a Level-1 device.

The protocol is listed as " ISIS-L2 " , indicating that R1 is an IS-IS Level-2 (backbone) router, not a Level-1 router.

Incorrect Answer Explanation:❌ B. R1 does not have IS-IS IPv6 routes.

Wrong! The output clearly shows six IS-IS IPv6 routes, proving this statement false.

Reference from Huawei HCIE-Datacom Documentation:

Huawei IPv6 Routing Protocols Guide – IS-IS for IPv6

HCIE-Datacom Routing & Switching Training – IS-IS L1 & L2 Operations

Huawei IS-IS Configuration Guide – IPv6 Route Management

Huawei Open Programmability System (OPS) and HTTP Request Headers

Huawei OPS allows network automation and programmability through HTTP-based APIs. When using Python scripts to send HTTP requests to network devices, the request headers must specify the content format for data exchange.

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

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

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