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| Section | Weight | Objectives |
|---|---|---|
| MPLS Technologies | 19% | - MPLS basics and label distribution - MPLS protection and fast reroute - MPLS VPN and traffic engineering |
| Advanced BGP Features | 10% | - BGP route attributes and policies - Route reflectors and confederations - BGP path control and filtering |
| IPv6 Routing | 20% | - BGP4+ and IPv6 route deployment - IPv6 addressing and transition technologies - OSPFv3 and IS-IS for IPv6 |
| Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Advanced IGP Features | 17% | - OSPF advanced features and optimization - IGP route selection and control - IS-IS advanced features and convergence |
| Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
| Advanced Ethernet Technologies | 10% | - VLAN stacking and QinQ - Advanced link aggregation and reliability - Ethernet OAM and protection mechanisms |
>> Valid H12-831_V1.0 Exam Answers <<
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NEW QUESTION # 81
In the figure, packets are forwarded based on MPLS on the network .
When PE2 receives a packet from P2 , what is the label value carried in the packet?
Options:
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS Label Switching
MPLS (Multiprotocol Label Switching) operates by adding labels to packets to enable fast switching across an MPLS domain.
* Labels are swapped at each router (LSR - Label Switch Router) based on the LFIB (Label Forwarding Information Base).
* When an MPLS packet reaches a router, it checks the incoming label and swaps it with an outgoing label as per its label forwarding table.
* The label value " 3 " is the implicit null label , which is used for PHP (Penultimate Hop Popping) .
2. Analyzing the MPLS Label Flow in the Figure
* At PE1 : The packet enters the MPLS domain and is labeled with 1033 .
* At P1 : P1 forwards the packet based on label 1033 .
* At P2 :
* P2 receives label 1033 and swaps it with label 3 (as per the figure).
* Label 3 (implicit null) means that the label is removed before reaching PE2 (PHP - Penultimate Hop Popping).
* This ensures that PE2 receives a pure IP packet without an MPLS label .
3. Evaluating Each Answer Option
* Option A: " The label value is 3. " # Incorrect.
* Label 3 (implicit null) is not actually sent to PE2.
* Instead, P2 removes the label before sending the packet to PE2 .
* Option B: " There is no label. " # Correct.
* Since P2 performs PHP (Penultimate Hop Popping) , the label is removed , and PE2 receives only an IP packet .
* Option C: " The label value is 1033. " # Incorrect.
* Label 1033 was used earlier in the MPLS path but was swapped out before reaching PE2.
* Option D: " The label values are 3 and 1033. " # Incorrect.
* Only one label is present at a time.
* Label 1033 was swapped for label 3 , but label 3 was removed before reaching PE2 .
Final answer:
B: (There is no label).
HCIP-Datacom-Advanced Routing & Switching Technology References:
* MPLS Label Forwarding Mechanism
* Penultimate Hop Popping (PHP) and Implicit Null Label (3)
* MPLS Label Swapping and Label Forwarding Table (LFIB)
NEW QUESTION # 82
By default, which of the following secure MAC address types will be lost after the device restarts?
Answer: B
NEW QUESTION # 83
As shown in the figure, all interfaces of the router enable OSPF, and the configurations of R1, R2, and R3 are as shown in the figure, then () will generate a Type 3 LSA with a linkState ID other than 0.0.0.0. (Please fill in the device name, such as R1)
Answer:
Explanation:
R3
NEW QUESTION # 84
On the OSPFv3 network shown in the figure, OSPFv3 parameters use default values. The LSDB is checked on one of the devices. The router IDs of R1, R3, and R4 are 10.0.1.1, 10.0.3.3, and 10.0.4.4, respectively. The Origin Router part of some LSAs is hidden. Complete this part. (Tokens can be reused.)
Answer:
Explanation:
Explanation:
LSAs and Their Origin Router Associations :
* Link-LSA : Origin Router = 10.0.1.1
* Intra-Area-Prefix-LSA : Origin Router = 10.0.4.4
* Network-LSA : Origin Router = 10.0.3.3
* Inter-Area-Prefix-LSA : Origin Router = 10.0.1.1
NEW QUESTION # 85
The exchange of Hello messages between two LSRs (Label switching Routers) triggers the establishment of an LDP session. The Hello message carries the transport address. The device with the smaller transport address will act as the active party and initiate the establishment of a TCP connection.
Answer: B
NEW QUESTION # 86
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