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Huawei H12-831_V1.0-ENU exam is a comprehensive certification exam that tests the knowledge and skills of IT professionals in advanced routing and switching technologies. H12-831_V1.0 exam is designed to assess the candidate's understanding of network architecture, network security, routing protocols, and switching technologies. H12-831_V1.0 Exam also tests the candidate's ability to design, implement, and maintain complex networks.
NEW QUESTION # 39
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The IPv6 address of Loopback0 on R4 is 2000::/128. The IPv6 summary 2000::/64 level-1-2 command is configured in the IS-IS processes of R2 and R1. Which of the following statements is false?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine which statement is false, we need to analyze the IS-IS topology, the role of multi-topology, the IPv6 summary configuration, and the level-1-2 behavior of IS-IS routers. Let's break it down step by step:
* Understanding the IS-IS Topology and Levels :
* IS-IS supports multiple levels: Level-1 (L1) for intra-area routing, Level-2 (L2) for inter-area routing, and Level-1-2 (L1-2) routers that can operate in both levels and connect L1 and L2 areas.
* In the figure, R1 and R2 are configured as Level-1-2 routers, R3 is a Level-1-2 router, R4 is a Level-1 router, and R5 is a Level-1 router. The area borders are indicated by the system IDs (49.0001 for R4's area and 49.0002 for R3 and R5's area).
* R4's Loopback0 has the IPv6 address 2000::/128, which is a host route (a /128 prefix, representing a single address).
* Multi-Topology IS-IS for IPv6 :
* Multi-topology IS-IS allows separate topologies for IPv4 and IPv6, ensuring that IPv6 routes are handled independently. Since multi-topology is enabled on all routers, IPv6 routes (like 2000::
/128 on R4) are advertised and processed within the IPv6 topology.
* This means that IPv6 routes, including the Loopback0 address of R4 (2000::/128), can be advertised across the IS-IS domain, subject to the level and summary configurations.
* IPv6 Summary Configuration (2000::/64 level-1-2) :
* The command ipv6 summary 2000::/64 level-1-2 is configured in the IS-IS processes of R1 and R2. This command instructs R1 and R2 (as Level-1-2 routers) to summarize the IPv6 prefix
2000::/64 and advertise it to both Level-1 and Level-2 areas.
* Summarization means that instead of advertising the more specific route (e.g., 2000::/128 from R4), R1 and R2 advertise the less specific summary route 2000::/64. This summary route covers the 2000::/128 address of R4's Loopback0.
* Since R1 and R2 are Level-1-2 routers, they can advertise this summary to both their Level-1 neighbors (like R4 and R3) and Level-2 neighbors (across areas).
* Analyzing Each Statement :
* A. The routing table of R1 contains the route 2000::/64.
* True. R1 is a Level-1-2 router with the ipv6 summary 2000::/64 level-1-2 command configured. It advertises and installs the summary route 2000::/64 in its routing table, covering the more specific 2000::/128 from R4. Additionally, as a Level-1-2 router, R1 can learn and retain this route from its IS-IS neighbors.
* B. The routing table of R2 contains the route 2000::/64.
* True. Similar to R1, R2 is also a Level-1-2 router with the same summary command. It advertises and installs the 2000::/64 summary route in its routing table, covering R4's
2000::/128.
* C. The routing table of R3 contains the route 2000::/128.
* False. R3 is a Level-1-2 router in area 49.0002, but it receives routes from R2 (a Level-1-2 router in area 49.0001). Because R1 and R2 are configured with the ipv6 summary 2000::
/64 level-1-2 command, they advertise the summary route 2000::/64 to their neighbors, including R3. IS-IS prefers the most specific route, but the summary configuration ensures that the more specific 2000::/128 from R4 is not advertised beyond R1 and R2 unless explicitly allowed. Since R3 is in a different area and receives the summary 2000::/64 from R2, it does not have the more specific 2000::/128 route in its routing table. Therefore, this statement is false.
* D. The routing table of R2 contains the route 2000::/128.
* True. R2, as a Level-1-2 router, is directly connected to R4 (a Level-1 router) via the IS-IS topology. R4 advertises its Loopback0 address 2000::/128 to R2. Even though R2 is configured to summarize 2000::/64, it can still retain the more specific 2000::/128 route in its routing table because IS-IS allows routers to keep both summary and more specific routes, with the more specific route taking precedence for routing decisions.
* Conclusion :
* The false statement is C, as R3 does not contain the route 2000::/128 in its routing table. Instead, R3 receives the summary route 2000::/64 from R2 due to the summary configuration on R1 and R2.
References to HCIP-Datacom-Advanced Routing & Switching Technology Documents :
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Section on IS-IS: Multi-Topology IS-IS for IPv6, Level-1 and Level-2 Operations, and Route Summarization.
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Chapter on IPv6 Routing Protocols:
IS-IS Configuration and Behavior, Including Summary Address Commands and L1/L2 Interactions.
NEW QUESTION # 40
An MPLS label is a 20-bit local identifier. Its label space is divided into special labels, static shared label space, and dynamic signaling protocol label space. Which of the following are dynamic signaling protocol labels? (Multiple choice)
Answer: C,D
NEW QUESTION # 41
MPLS has the concept of FEC forwarding equivalence class, so FEC cannot be allocated based on which of the following standards?
Answer: C
NEW QUESTION # 42
The figure shows the network and VPN plan of an enterprise. Match the sites that can communicate with each other. (Note: A site cannot be matched with itself. For example, Site 1 cannot be matched with Site 1.)
Answer:
Explanation:
Explanation:
One valid mapping is:
* Site 1 # Site 2
* Site 2 # Site 1
* Site 3 # Site 4
* Site 4 # Site 3
In BGP/MPLS IP VPN networks, communication between VPN sites depends on matching Route Target attributes.
A VPN instance imports a route when the advertised Export RT matches its configured Import RT. For bidirectional connectivity, the RT relationship must permit routing information in both directions.
VPN1 exports RT 200:1, which VPN2 imports. VPN2 exports RT 100:1, which VPN1 imports. Therefore, Site 1 and Site 2 can communicate.
VPN3 exports RT 300:1, which VPN4 imports. VPN4 exports RT 200:1, which VPN3 imports. Therefore, Site 3 and Site 4 can communicate.
Verification note: The exhibit also permits bidirectional communication between Site 1 and Site 3. Therefore, the drag-and-drop is not uniquely determined if only one match per site is permitted. The mapping above is valid, but it is not the only valid mapping.
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf
NEW QUESTION # 43
An administrator runs the display mpls lsp command to view LSPs on a device. The command output is shown in the figure.
Which of the following statements is true ?
Options:
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Forwarding Information
The output of the display mpls lsp command shows the Label Forwarding Information Base (LFIB) used by the router to forward MPLS packets.
Each entry consists of:
* FEC (Forwarding Equivalence Class): The destination IP prefix.
* In Label / Out Label: Incoming label (received) and outgoing label (sent).
* In IF / Out IF: Incoming and outgoing interfaces.
2. Analyzing the Given LSP Table
FEC (Destination IP)
In Label
Out Label
Outgoing Interface
1.1.1.1/32
3
NULL
-
2.2.2.2/32
NULL
3
GE0/0/1
2.2.2.2/32
1026
3
GE0/0/1
3.3.3.3/32
NULL
1027
GE0/0/1
3.3.3.3/32
1027
1027
GE0/0/1
Key Observations:
* NULL means the label is removed (Penultimate Hop Popping - PHP).
* Label 3 is the implicit null label, meaning the label is removed before sending to the next router.
* For destination 3.3.3.3, the router adds label 1027 before forwarding it to GE0/0/1.
3. Evaluating Each Answer Option
* Option A: " Before forwarding a packet destined for 2.2.2.2, the device adds label 3 to the packet.
" # Incorrect.
* The output shows that packets destined for 2.2.2.2 have the NULL (label 3) entry , which means the label is removed before forwarding, not added.
* Option B: " Before forwarding a packet destined for 1.1.1.1, the device adds label 3 to the packet.
" # Incorrect.
* The entry 1.1.1.1 # 3/NULL means the label is removed (PHP) , so the device does not add label 3.
* Option C: " Before forwarding a packet destined for any IP address, the device removes labels from the packet. " # Incorrect.
* The device removes labels only for some destinations (e.g., 1.1.1.1 and 2.2.2.2), but it adds label 1027 for 3.3.3.3 .
* Not all IPs have their labels removed.
* Option D: " Before forwarding a packet destined for 3.3.3.3, the device adds label 1027 to the packet. " # Correct.
* The entry 3.3.3.3 # NULL/1027 means that the router adds label 1027 before forwarding packets to GE0/0/1 .
Final answer:
D: (Before forwarding a packet destined for 3.3.3.3, the device adds label 1027 to the packet).
HCIP-Datacom-Advanced Routing & Switching Technology References:
* Understanding MPLS LDP (Label Distribution Protocol) and LFIB
* Implicit Null (Label 3) and Penultimate Hop Popping (PHP)
* MPLS Label Swapping and Forwarding Process
NEW QUESTION # 44
......
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