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Huawei H12-831_V1.0-ENU Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| BGP and Internet Routing | - Advanced BGP features
|
| IPv6 and Network Services | - Network services
|
| MPLS and VPN Technologies | - VPN technologies
|
| Advanced Routing Protocols | - OSPF Advanced Concepts
|
| Network Design and Troubleshooting | - Enterprise network design
|
Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions:
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 a PIM-SM multicast network, a network engineer finds that multicast clients cannot receive multicast data. Which of the following is not a possible cause of this problem?
- A. The downstream interfaces of multicast devices do not receive any (*, G) Join messages.
- B. The RP addresses of multicast devices are different.
- C. Downstream interfaces of multicast devices are disabled from forwarding State-Refresh messages.
- D. The unicast routes from multicast devices to the RP are unavailable.
Correct Answer: C 🗳️
On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3 , and the IPv6 address of Loopback0 on R6 is 2000::6/128 . OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA . IS-IS routes are imported to OSPFv3 on R2 and R3 . Which of the following statements are false?
- A. R3 generates an Inter-Area-Router-LSA in area 0.
- B. R1 generates an Inter-Area-Router-LSA in area 2.
- C. R2 generates an Inter-Area-Router-LSA in area 1.
- D. R2 generates an Inter-Area-Router-LSA in area 0.
Correct Answer: B,C 🗳️
Explanation: Only visible for PassCollection members. You can sign-up / login (it's free).
On the OSPFv3 network shown in the figure, OSPFv3 parameters use default values. The LSDB is checked on one of the devices. The router IDs of R1, R3, and R4 are 10.0.1.1, 10.0.3.3, and 10.0.4.4, respectively. The Origin Router part of some LSAs is hidden. Complete this part. (Tokens can be reused.)

Correct Answer:

Explanation:
LSAs and Their Origin Router Associations :
* Link-LSA : Origin Router = 10.0.1.1
* Intra-Area-Prefix-LSA : Origin Router = 10.0.4.4
* Network-LSA : Origin Router = 10.0.3.3
* Inter-Area-Prefix-LSA : Origin Router = 10.0.1.1
The network administrator configures DHCP snooping on an access switch. Which of the following solutions can be used to reduce the impact of denial of service (DoS) on the DHCP server caused by malicious IP address requests of attackers?
- A. Configure DHCP snooping to check the CHADDR field in DHCP request packets.
- B. Configure the switch interface connected to the authorized DHCP server as a trusted interface.
- C. Enable the device to generate static MAC address entries for interfaces based on DHCP snooping binding entries.
- D. Configure DHCP snooping to limit the number of MAC addresses learned by interfaces on the switch.
Correct Answer: A,B,D 🗳️
Explanation: Only visible for PassCollection members. You can sign-up / login (it's free).






