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| Section | Objectives |
|---|---|
| Topic 1: Network Automation and Programmability | - SDN and automation
|
| Topic 2: Routing and Switching Technologies | - Switching technologies
|
| Topic 3: IPv6 and Advanced IP Technologies | - IPv6 deployment
|
| Topic 4: WAN and VPN Technologies | - MPLS fundamentals
|
| Topic 5: Network Security and QoS | - Security mechanisms
|
| Topic 6: Enterprise Network Architecture | - Network design principles
|
| Topic 7: Data Center and Virtualization Technologies | - VXLAN and overlay networks
|
>> H12-891_V1.0 Fragenkatalog <<
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278. Frage
The following message about OSPFV3 is correct?
Antwort: A,C,D
279. Frage
To obtain the token ID of iMaster NCE, you need to send an HTTP request message that includes the following Python code to invoke an iMaster NCE RESTful API.
Which of the following statements is incorrect?
import requests
nbi_name = " demo13@north.com "
nbi_pwd = " CgocVcVe1@ "
host = " 139.9.213.72 "
port = " 18002 "
URI = " /controller/v2/tokens "
post_token_url = " https:// " + host + " : " + port + URI
headers_post = { " Content-Type " : " application/json " , " Accept " : " application/json " } r = requests.post(post_token_url, headers=headers_post, json={ " userName " : nbi_name, " password " :
nbi_pwd}, verify=False)
Antwort: A
Begründung:
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)
280. Frage
Exhibit:
The following figure shows the inter-AS MPLS VPN Option C (solution 2). RRs are deployed, and no traffic passes through the RRs during forwarding. If a data packet sent from PE2 to 192.168.1.1 carries two labels, which of the following statements about the two labels are correct?
Antwort: A,D
Begründung:
Understanding Inter-AS MPLS VPN Option C (Solution 2)
In MPLS L3VPN Inter-AS Option C, the Route Reflectors (RRs) are used for VPN route distribution but do not participate in data forwarding. The traffic forwarding path is based on MPLS labels assigned at different routers.
Each data packet carries two MPLS labels:
* Transport Label (T1) - Used for forwarding within the backbone.
* VPN Label (V1) - Used for VPN route identification.
Breaking Down the Labels:
# VPN Label (V1) - Allocated by PE1
* V1 (Inner Label) is the VPN label assigned by the egress PE router (PE1).
* This label ensures that when the packet reaches PE1, it knows how to forward the traffic to CE1 (192.168.1.1).
# Transport Label (T1) - Allocated by P2
* T1 (Outer Label) is the transport label assigned by P2 to forward the packet across the AS core.
* This label ensures the packet reaches the next-hop router (ASBR-PE1 in AS100).
Why Are the Other Options Incorrect?
# A. "T1 is allocated by RR2" (Incorrect)
* RR2 is used only for route reflection; it does not participate in label allocation or forwarding.
# D. "V1 is allocated by P2" (Incorrect)
* P2 is an intermediate router and does not allocate VPN labels.
* VPN labels are always assigned by the egress PE router (PE1 in AS100).
# Reference: Huawei HCIE Datacom - MPLS L3VPN Inter-AS Option C
281. Frage
On the bearer WAN shown in the figure,SR (Segment Routing)is deployed, and the controller is used to compute paths. Drag network technologies on the left to the corresponding application locations on the right.
Antwort:
Begründung:
Explanation:
Comprehensive and Detailed In-Depth Explanation:
The diagram shows aWAN networkwhereSegment Routing (SR)is used in conjunction with theiMaster NCEcontroller. The network consists ofData Centers (DCs),Branches,Provider Edge (PE)routers, andRoute Reflectors (RR)withinAS 65600. Let's analyze each network technology and its placement in the scenario.
1. BGP-LS (Border Gateway Protocol - Link State):
Application Location:1 (PE to RR)
BGP-LS is used tocollect and distribute network topology informationfrom theIGP (Interior Gateway Protocol)domain.
It enables theiMaster NCE(controller) to learn about the network topology and SR information from PE routers.
The PE routers send theirlink-state informationto theRRusingBGP-LS.
Why Location 1:
The RR collects topology data from PEs and forwards it to the controller for path computation.
2. BGP (Border Gateway Protocol):
Application Location:2 (RR to iMaster NCE)
Standard BGP is used forroute distributionandnetwork connectivity.
The RR usesBGPto exchange route information with thecontroller(iMaster NCE).
Why Location 2:
TheRRaggregates routes and exchanges them with the iMaster NCE for centralized management.
3. MP-IBGP (Multiprotocol Internal BGP):
Application Location:3 (PE to PE)
MP-IBGP is used toexchange VPNv4 and VPNv6 routesbetween PE routers within thesame AS.
It allows PEs toadvertise VPN routesacross thebackbone network.
Why Location 3:
PEs need to communicate VPN-related information within the AS, ensuring end-to-end connectivity between DCs and branches.
4. BGP SR-Policy/PCEP (Path Computation Element Protocol):
Application Location:4 (iMaster NCE to PE)
BGP SR-Policy andPCEPare used by thecontrollertodistribute SR policiesto the PE routers.
TheiMaster NCEcalculates optimal paths and sends the SR policies to PEs viaBGP SR-PolicyorPCEP.
Why Location 4:
The controller programs theSegment Routing pathsdirectly to the PEs for optimal traffic engineering.
Why This Mapping Is Correct:
The mapping is based on theroles and functions of each protocolwithin theSR-based WAN architecture. The controller uses BGP-LS to learn topology, BGP for route reflection, MP-IBGP for VPN route exchange, and BGP SR-Policy/PCEP for path computation and distribution.
282. Frage
When configuring ISIS zone authentication, which ISIS message will carry the authentication letter? ( Single choice questions).
Antwort: B
283. Frage
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