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Huawei H12-831_V1.0-ENU Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: MPLS and VPN Technologies | - VPN technologies
|
| Topic 2: BGP and Internet Routing | - Advanced BGP features
|
| Topic 3: Advanced Routing Protocols | - IS-IS Routing Protocol
|
| Topic 4: Network Design and Troubleshooting | - Enterprise network design
|
| Topic 5: IPv6 and Network Services | - Network services
|
Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions:
On the OSPF network shown in the figure, area 1 is an NSSA , area 2 is a stub area , and R4 imports an external route 10.0.4.4/32 . The router ID of each router is 10.0.X.X , where X is the router number . The asbr-summary 10.0.4.0 255.255.255.0 command is configured in the OSPF processes of R1 and R3 .
Match the following descriptions of routing tables with the corresponding routers :
Correct Answer:
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Key OSPF Concepts to Consider:
* Area 1 is an NSSA (Not-So-Stubby Area):
* NSSAs allow external routes but advertise them as Type-7 LSAs.
* The ABR (R2) converts these Type-7 LSAs into Type-5 LSAs for the backbone (Area 0).
* Area 2 is a Stub Area:
* Stub areas do not allow external routes (Type-5 LSAs) .
* This means that R5 (inside Area 2) will NOT receive external routes like 10.0.4.4/32 or
10.0.4.0/24 .
* Effect of asbr-summary 10.0.4.0 255.255.255.0 on R1 and R3:
* This command ensures that R1 and R3 will see a summarized route 10.0.4.0/24 instead of specific /32 routes .
Routing Table Analysis:
* R1 (ABR for NSSA, with ASBR summary configured)
* Connected to Area 1 (NSSA) and Area 0 (Backbone)
* Since asbr-summary 10.0.4.0 255.255.255.0 is configured on R1, it contains both 10.0.4.4/32 (from R4) and the summarized 10.0.4.0/24 .
* # Matches Option 4: The routing table contains both 10.0.4.4/32 and 10.0.4.0/24.
* R5 (Inside Area 2 - Stub Area)
* Stub areas do not receive external routes (Type-5 LSAs) .
* Since R5 is inside a stub area, it does not contain 10.0.4.4/32 or 10.0.4.0/24 .
* # Matches Option 3: The routing table does not contain 10.0.4.4/32 or 10.0.4.0/24.
* R2 (ABR between NSSA and Backbone, but no ASBR summary configured)
* R2 converts Type-7 LSAs from R4 into Type-5 LSAs and advertises them into Area 0.
* Since no ASBR summary is configured on R2 , it only sees the specific external route 10.0.4.4
/32 but not the summarized 10.0.4.0/24 .
* # Matches Option 1: The routing table contains 10.0.4.4/32 only.
* R3 (Another ABR with ASBR summary configured)
* R3 has asbr-summary 10.0.4.0 255.255.255.0 configured, which means it will summarize the external routes.
* Instead of 10.0.4.4/32, R3 will only have the summarized 10.0.4.0/24 route.
* # Matches Option 2: The routing table contains 10.0.4.0/24 only.
References:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Areas (Stub, NSSA, and Backbone) OSPF External Route Advertisement and Summarization OSPF NSSA Behavior and Type-7 to Type-5 Conversion
On the network shown in the figure, a network engineer finds that the path between PC1 and PC2 is not the optimal path , and all links along the path have the same cost .
Given this, which of the following routers may be the root bridges of the Layer 2 network?
Options:
- A. SW1
- B. SW4
- C. SW3
- D. SW2
Correct Answer: A,B 🗳️
Explanation: Only visible for Exams-boost members. You can sign-up / login (it's free).
There are multiple types of MAC address entries on a switch. Which of the following entries are manually configured and cannot be aged out?
- A. Dynamic MAC address entries
- B. Static MAC address entries
- C. Blackhole MAC address entries
- D. MUX MAC address entries
Correct Answer: B,C 🗳️
VLAN aggregation is configured on a switched network. Sub-VLAN 2 and Sub-VLAN 3 are added to Super-VLAN 10 . To enable hosts in different sub-VLANs to communicate with each other , run the following command in the VLANIF 10 view corresponding to the Super-VLAN .
(Enter lowercase letters.)
Correct Answer:
inter-sub-vlan-proxy enable
Explanation:
Understanding VLAN Aggregation (Super-VLAN and Sub-VLANs)
* VLAN aggregation allows multiple sub-VLANs to be grouped under a super-VLAN , reducing the number of VLANIF interfaces required for IP address configuration.
* Super-VLAN : A logical VLAN that does not forward Layer 2 traffic directly but is used for Layer 3 communication .
* Sub-VLANs : VLANs that exist within the Super-VLAN but cannot communicate with each other by default.
2# # Why is the " inter-sub-vlan-proxy enable " Command Needed?
* By default, hosts in different sub-VLANs under the same super-VLAN cannot communicate with each other because sub-VLANs do not exchange MAC address information.
* The inter-sub-vlan-proxy enable command allows Layer 3 communication between sub-VLANs under the same super-VLAN by acting as a proxy for ARP requests and replies .
* This enables inter-sub-VLAN communication while still reducing the number of VLANIF interfaces required.
3# # Command Syntax and Execution
* The correct command should be run under the VLANIF interface of the super-VLAN :
[Switch] interface vlanif 10
[Switch-Vlanif10] inter-sub-vlan-proxy enable
Reference: HCIP-Datacom Advanced Routing & Switching Technology - VLAN Aggregation and Inter- Sub-VLAN Communication
OSPF supports equal-cost load balancing. When the number of equal-cost routes on the network is greater than the number specified in the maximum load-balancing command and the candidate routes have the same priority (weight value), the routes with larger interface indexes are selected for load balancing.
- A. FALSE
- B. TRUE
Correct Answer: A 🗳️
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