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Huawei H12-831_V1.0 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Advanced IGP Features | 17% | - OSPF advanced features
|
| IPv6 Routing | 20% | - IPv6 address planning and configuration - Transition mechanisms (dual-stack, tunnel, translation) - OSPFv3 and IS-IS for IPv6 - BGP4+ for IPv6 |
| MPLS Technologies | 19% | - LDP and RSVP-TE protocols - MPLS VPN (L3VPN, L2VPN) - MPLS fundamentals and label distribution - MPLS OAM and protection |
| Network Cutover | 7% | - Implementation and rollback strategy - Post-cutover validation - Pre-cutover verification - Cutover planning and risk assessment |
| Advanced BGP Features | 10% | - BGP multi-homing and load balancing - BGP route selection and attributes - Routing policies and filtering - Route reflectors and confederations |
| Advanced Ethernet Technologies | 10% | - Ethernet link aggregation and reliability - VLAN aggregation and MUX VLAN - QinQ and VLAN mapping - Port isolation and security features |
| Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Performance and service fault resolution - Structured troubleshooting methodology - Switching and link fault handling |
| Network O&M | 7% | - Routine maintenance procedures - Log and alarm management - Network monitoring and performance analysis - Configuration management and backup |
Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions:
R1 forwards a packet with the destination IP address of 4.4.4.4 on an MPLS network.
* Some LSP (Label Switched Path) information of R3 is shown in the figure.
* During packet transmission, which of the following devices perform MPLS label operations?
- A. R1
- B. R2
- C. R4
- D. R3
Correct Answer: A,B,D 🗳️
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In the hub-spoke networking shown in the figure, to ensure correct route transmission, an administrator must manually configure the peer 10.1.2.1 _____ command in the IPv4 address family view of the BGP-VPN_out instance on the Hub-PE.
(Enter the answer in lowercase letters only.)
Correct Answer:
next-hop-self
Explanation:
To determine the correct command, we need to analyze BGP behavior in a Hub-Spoke topology and how routes are advertised in MPLS VPN environments.
1. Understanding the Hub-Spoke BGP/MPLS VPN Topology
* The network consists of Hub-PE and Spoke-PE routers, which are MPLS VPN PEs.
* Hub-PE is responsible for distributing routes between Spoke-PE1 and Spoke-PE2.
* Spoke routers do not have direct IBGP peering with each other; instead, they rely on the Hub-PE to relay routes.
* BGP next-hop handling is critical for proper route advertisement.
2. Why is the " next-hop-self " Command Required?
* By default, when BGP advertises a route, the next-hop remains unchanged (i.e., the original next-hop is retained).
* In Hub-Spoke topology, Spoke routers would receive routes with a next-hop IP that belongs to another Spoke-PE, which is not reachable directly.
* To solve this issue, we use the next-hop-self command on the Hub-PE, so that:
* Hub-PE updates the next-hop to its own address before advertising routes to the Spoke-PEs.
* This ensures that Spoke-PE routers use the Hub-PE as the next-hop, making routes reachable and preventing blackholing.
3. Correct Command Usage
The administrator must run the following command under the BGP IPv4 address family of the BGP-VPN_out instance on Hub-PE:
shell
CopyEdit
peer 10.1.2.1 next-hop-self
This ensures that the next-hop for advertised routes is changed to the Hub-PE ' s IP, allowing proper route transmission in the Hub-Spoke MPLS VPN environment.
On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following statements are true?
- A. The default route exists in the routing table of R2.
- B. Although the default-route-advertise always level-1 command is configured on R1, R1 cannot import the default route.
- C. The default route exists in the routing table of R3.
- D. The default route does not exist in the routing table of R1.
Correct Answer: A,D 🗳️
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The figure shows the logical network architecture of a migration project. The purpose of the migration is to add network device R4 between R2 and R3. The router IDs of R1, R2, and R3 are 10.0.1.1, 10.0.2.2, and
10.0.3.3, respectively. OSPF runs between network devices. After the physical network is connected, a network engineer incorrectly imports the backup configuration of R3 to R4 during the migration. Given this, which of the following statements are true?
- A. The LSDB of R1 contains the LSA generated by R3.
- B. The LSDB of R2 contains the LSA generated by R4.
- C. The LSDB of R3 contains the LSA generated by R4.
- D. The LSDB of R2 contains the LSA generated by R3.
Correct Answer: A,B 🗳️
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On the network shown in the figure, the DHCP server function is enabled on GEO/0/0 of R2, and the address pool is an interface address pool. When GEO/0/0 and GEO/0/1 of R1 function as DHCP clients, only one interface can obtain an IP address by default.
- A. FALSE
- B. TRUE
Correct Answer: B 🗳️
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