H12-831_V1.0試験無料問題集「Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 認定」
On the OSPFv3 network shown in the figure:
* Area 1 is a stub area, Area 2 is a common area, and Area 3 is an NSSA (Not-So-Stubby Area).
* 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.
* The stub no-summary command is configured in Area 1 on R2.
Which of the following statements is true?
* Area 1 is a stub area, Area 2 is a common area, and Area 3 is an NSSA (Not-So-Stubby Area).
* 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.
* The stub no-summary command is configured in Area 1 on R2.
Which of the following statements is true?
正解：A
解答を投票する
解説: (GoShiken メンバーにのみ表示されます)
In the BFD (Bidirectional Forwarding Detection) mechanism, two systems establish a BFD session and periodically send BFD control packets along the path between them. If one system does not receive BFD control packets within a specified period, the path is considered faulty.
Which of the following is NOT a possible cause of the BFD session down event?
Options:
Which of the following is NOT a possible cause of the BFD session down event?
Options:
正解：A
解答を投票する
解説: (GoShiken メンバーにのみ表示されます)
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:
Match the following descriptions of routing tables with the corresponding routers:
正解：
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
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.)
正解：
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
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
On the network shown in the figure, an administrator first completes the routing configuration and then enables MPLS and LDP on R1, R2, and R3 and their interconnected interfaces. In this manner, traffic from PC1 to PC2 can be forwarded based on MPLS. Which of the following routing configurations can implement this function?
Options:
Options:
正解：C
解答を投票する
解説: (GoShiken メンバーにのみ表示されます)
On the network shown in the figure, single-hop BFD is configured on R1 and R2.
A network engineer finds that the BFD session goes down. To locate the fault, the network engineer queries the BFD configurations on R1 and R2.
According to the configuration information marked in the figure, it can be determined that mismatched time parameter settings on R1 and R2 cause the BFD session to go down.
Is this statement TRUE or FALSE?
A network engineer finds that the BFD session goes down. To locate the fault, the network engineer queries the BFD configurations on R1 and R2.
According to the configuration information marked in the figure, it can be determined that mismatched time parameter settings on R1 and R2 cause the BFD session to go down.
Is this statement TRUE or FALSE?
正解：A
解答を投票する
解説: (GoShiken メンバーにのみ表示されます)