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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Troubleshooting | 10% | - Structured troubleshooting processes - Troubleshooting methods |
| Topic 2: Advanced BGP Features | 10% | - Advanced BGP features - Inter-domain routing optimization - BGP route control - Route reflectors |
| Topic 3: MPLS Technologies | 19% | - MPLS VPN applications - MPLS principles - MPLS configuration - MPLS forwarding |
| Topic 4: Advanced IGP Features | 17% | - OSPF advanced features - Route control - Fast convergence - IS-IS advanced features |
| Topic 5: Advanced Ethernet Technologies | 10% | - Ethernet security - VLANs |
| Topic 6: Network O&M | 7% | - Data collection - Routine maintenance |
| Topic 7: Network Cutover | 7% | - Basic cutover concepts - Migration process |
| Topic 8: IPv6 Routing | 20% | - OSPFv3 - BGP4+ - IPv6 static routes - IS-IS for IPv6 |
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NEW QUESTION # 189
As shown in the figure, R1, R2, and R3 run WPLS, and the administrator configures a static LSP from the 1.1.1.0/24 network segment to the 3.3.3.0/24 network segment.
Which of the following descriptions of this scene are correct? (Multiple choice)
Answer: A,B
NEW QUESTION # 190
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PCI and PC2, respectively. Given this, which of the following statements is false?
Answer: C
NEW QUESTION # 191
IGP converges faster than BGP, which may cause network traffic loss. By enabling the OSPF and BGP linkage feature of the device, the device remains as a () router within the set linkage time, so that the link metric value in the advertised LSA is the maximum value, thereby telling other OSPF devices not to use this router to forward data, so as to avoid the loss of traffic. (Note: If English letters are involved, all capitals are required)
Answer:
Explanation:
STUB
NEW QUESTION # 192
When an IP packet passes through an MPLS network, an MPLS device processes the TTL value in the packet.
If the pipe mode is used in the topology shown in the figure, which of the following is the TTL value in the IP packet?
Options:
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding MPLS TTL Processing
* TTL (Time to Live) is an IP field that prevents routing loops by decrementing at each hop.
* In an MPLS network, the TTL field can be processed in two modes:
* Uniform Mode (Default Mode)
* Pipe Mode (TTL is preserved in the MPLS domain)
2. TTL Processing in Pipe Mode
Pipe mode is used to prevent the MPLS backbone from affecting the TTL of an IP packet.
* When an IP packet enters the MPLS domain, the original TTL is copied into the MPLS header.
* Inside the MPLS network:
* MPLS labels use their own TTL values, and the IP TTL is not decremented.
* Each P router (transit router) decrements only the MPLS TTL, not the IP TTL.
* When the packet leaves the MPLS domain (at PE2):
* The original IP TTL is restored but decremented by 1 as it exits to CE2.
3. Analyzing the TTL Behavior in the Given Topology
* Initial IP TTL from CE1 = 255
* At PE1:
* IP TTL remains 255 as it is copied into the MPLS label.
* MPLS TTL starts at 255 (same as IP TTL).
* At P Router:
* MPLS TTL is decremented (255 # 254).
* IP TTL remains unchanged (255) because of Pipe mode.
* At PE2 (Egress Router):
* IP TTL is restored and decremented by 1 (255 # 254).
Thus, the correct sequence is:
# IP TTL: 255 # 255 # 254
4. Evaluating the Answer Choices
Option
TTL Values
Correct?
Reasoning
A
255 # 254 # 252
# Incorrect
IP TTL should remain 255 inside MPLS
B
254 # 253 # 252
# Incorrect
IP TTL starts at 255, not 254
C
255 # 255 # 254
# Correct
IP TTL is preserved in pipe mode inside MPLS and decremented only at egress.
D
254 # 254 # 253
# Incorrect
Initial IP TTL should be 255, not 254
# Correct Answer: C. 255 # 255 # 254
Final Conclusion:
* Pipe mode ensures that the MPLS domain does not affect the IP TTL while the packet is inside the MPLS network.
* Only the egress PE (PE2) decrements the IP TTL before forwarding the packet to CE2.
* Thus, the correct TTL sequence is 255 # 255 # 254.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - MPLS TTL Processing Huawei Official HCIP-Datacom Study Guide - Pipe Mode vs. Uniform Mode in MPLS Huawei Documentation on MPLS TTL Handling in Pipe Mode
NEW QUESTION # 193
The routing policy tools that can be used by BGP mainly include Filter-policy and Route-policy. Fiter-policy can only filter routes, and Route-policy can only modify routes.
Answer: B
NEW QUESTION # 194
......
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