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Huawei H12-831_V1.0 Exam Syllabus Topics:

Section	Objectives
Network Services and Optimization	- QoS Fundamentals 1. Congestion management mechanisms 2. Traffic classification and marking - Multicast Technologies 1. Multicast distribution models 2. PIM protocol operations
Advanced Routing Protocols	- OSPF Advanced Features 1. LSA types and area types 2. Route calculation and optimization - BGP Configuration and Policy Control 1. Route filtering and policy control 2. BGP attributes and path selection
Network Design and Troubleshooting	- Enterprise Network Design 1. Hierarchical network architecture 2. High availability design principles - Fault Diagnosis 1. Routing loop troubleshooting 2. Protocol convergence issues
MPLS and VPN Technologies	- VPN Implementation 1. Inter-AS VPN scenarios 2. L3VPN configuration principles - MPLS Fundamentals 1. Label switching mechanism 2. LDP basics
IP Network Technologies	- IS-IS Routing Protocol 1. Route convergence and optimization 2. Level-1/Level-2 design - IPv6 Deployment 1. IPv6 addressing and transition mechanisms 2. Dual-stack and tunneling technologies

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Huawei HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Sample Questions (Q136-Q141):

NEW QUESTION # 136
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:

A. Before forwarding a packet destined for any IP address, the device removes labels from the packet.
B. Before forwarding a packet destined for 2.2.2.2, the device adds label 3 to the packet.
C. Before forwarding a packet destined for 1.1.1.1, the device adds label 3 to the packet.
D. Before forwarding a packet destined for 3.3.3.3, the device adds label 1027 to the packet.

Answer: D

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:
(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 # 137
Both VLAN aggregation and MUX VLAN are deployed on the enterprise network shown in the figure, and all switch interfaces connected to terminals are access interfaces. Given this, match PCI to PC4 with the hosts or servers that they can access on the network. (Note: A host cannot be matched with itself. For example, PCI cannot match PCI.) (Tokens can be reused.)

Answer:

Explanation:

NEW QUESTION # 138
Which of the following operations does a network engineer not need to perform when processing a single-hop BFD session Dom?

A. Ping the link between the BFD sessions to check whether forwarding is normal.
B. Run the display current-configuration configuration bfd command to check whether the local discriminator and remote discriminator at both ends of the BFD session match.
C. Repeat the display bfd statistics session all command to view the statistics of the BFD session sent and received packets.
D. If a static route is bound to a BFD session, run the display ip routing-tab1e command to check whether the static route exists in the routing table.

Answer: B

NEW QUESTION # 139
In an operator's MPLSVPN network, there are two devices, PE1 and PE2, for MPLSVPN data forwarding. PE1 receives a 172.16.1.0/24 private network route from the client, and transforms it into a VPNv4 route on PE1 and assigns labels. Released to PE2 as 1027. The outgoing label of the MPLSLSR-ID from PE2 to PE1 is 1025.
When the client on PE2 accesses 172.16.1.0/24, the inner and outer labels of the frame sent by PE2 should be the combination of the following options?

A. Outer label: 1025, inner label: 1025
B. Outer label: 1025, inner label: 1027
C. Outer label: 1027, inner label: 1025
D. Outer label: 1027, inner label: 1027

Answer: B

NEW QUESTION # 140
Which of the following TLVs is added to IS-IS to support multi-topology?

A. TLV229
B. TLV232
C. TLV236
D. TLV129

Answer: A

NEW QUESTION # 141
......

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