Free H12-831_V1.0 Questions for Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 H12-831_V1.0 Exam as PDF & Practice Test Engine
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. Which of the following is the cost value of the route 10.0.35.0/24 in the routing table of R1?
Correct Answer: C
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On the network shown in the figure, EBGP peer relationships are established between ASs through directly connected interfaces .
* OSPF is deployed in AS 65456 (with OSPF disabled on interconnected interfaces between ASs ).
* R4 and R5 use Loopback0 to establish iBGP peer relationships with R6 .
* The IP address of Loopback0 on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router .
* R1, R2, and R3 import the external route 192.168.1.0/24 into BGP through the import-route command.
Which of the following statements are true ?
* OSPF is deployed in AS 65456 (with OSPF disabled on interconnected interfaces between ASs ).
* R4 and R5 use Loopback0 to establish iBGP peer relationships with R6 .
* The IP address of Loopback0 on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router .
* R1, R2, and R3 import the external route 192.168.1.0/24 into BGP through the import-route command.
Which of the following statements are true ?
Correct Answer: A,C
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On the OSPF network shown in the figure, area 1 is an NSSA, area 2 is a common 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 number of the router. The command asbr-summary 10.0.4.0 255.255.255.0 is configured in the OSPF processes of R1 and R3. Which of the following statements is true?
Correct Answer: D
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I-SPF and PRC can speed up ISIS route convergence. PRC does not calculate nodes. Instead, it updates routes based on the shortest path tree (SPT) calculated using the SPF algorithm.
Correct Answer: B
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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.)
(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
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
If end-to-end QoS is configured on an MPLS network, the penultimate hop device on the MPLS network can pop MPLS labels from packets based on penultimate hop popping (PHP), so that the egress node can process packets based on the QoS priority in inner packets.
Correct Answer: B
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On the OSPF network shown in the figure, R1 and R2 use OSPF to communicate with each other through Loopback0 . In addition:
* MPLS LDP is enabled on R1 and R2 .
* The LDP transport address is the IP address of Loopback0 .
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?
Options:
* MPLS LDP is enabled on R1 and R2 .
* The LDP transport address is the IP address of Loopback0 .
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?
Options:
Correct Answer: B,C
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Using the display startup command, you can view the running system software, running configuration file, startup system software, and startup configuration file , as well as the paths where these files are stored .
Options:
Options:
Correct Answer: B
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On the OSPFv3 network shown in the figure:
* Area 1 is a stub area
* Area 2 is a common area
* Area 3 is an NSSA
* The IPv6 address of Loopback0 on R6 is 2000::6/128 .
* The router ID of each router is 10.0.X.X, where X is the router number .
Which of the following statements are true?
* Area 1 is a stub area
* Area 2 is a common area
* Area 3 is an NSSA
* The IPv6 address of Loopback0 on R6 is 2000::6/128 .
* The router ID of each router is 10.0.X.X, where X is the router number .
Which of the following statements are true?
Correct Answer: B,C
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A network engineer draws a schematic diagram of a multicast network (shown in the figure) during troubleshooting. R1 and R2 run IGMP version 2 and use PIM-SM as the multicast routing protocol. The default settings are used for other parameters. Given this, the querier on the multicast network is_____. (Enter the device ID, for example, R1.)
Correct Answer:
R1
Explanation:
IGMPv2 performs an independent querier election on a shared network segment. When multiple multicast routers initially consider themselves queriers, they exchange IGMP General Query messages and compare the source IP addresses of those messages. The multicast router with the lowest interface IP address becomes the IGMP querier.
The relevant addresses are:
* R1: 10.0.12.1/24
* R2: 10.0.12.2/24
Because 10.0.12.1 is numerically lower than 10.0.12.2, R1 is elected as the IGMP querier . R2 becomes a non-querier and stops periodically transmitting General Query messages while it continues receiving valid queries from R1.
PIM-SM does not change this result. PIM designated-router election and IGMP querier election are separate processes and may select different routers. The question specifically asks for the IGMP querier; therefore, the IGMPv2 lowest-IP rule applies. Huawei IGMPv2 working mechanism .
Explanation:
IGMPv2 performs an independent querier election on a shared network segment. When multiple multicast routers initially consider themselves queriers, they exchange IGMP General Query messages and compare the source IP addresses of those messages. The multicast router with the lowest interface IP address becomes the IGMP querier.
The relevant addresses are:
* R1: 10.0.12.1/24
* R2: 10.0.12.2/24
Because 10.0.12.1 is numerically lower than 10.0.12.2, R1 is elected as the IGMP querier . R2 becomes a non-querier and stops periodically transmitting General Query messages while it continues receiving valid queries from R1.
PIM-SM does not change this result. PIM designated-router election and IGMP querier election are separate processes and may select different routers. The question specifically asks for the IGMP querier; therefore, the IGMPv2 lowest-IP rule applies. Huawei IGMPv2 working mechanism .
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