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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced IGP Features | 17% | - Fast convergence - IS-IS advanced features - Route control - OSPF advanced features |
| Topic 2: IPv6 Routing | 20% | - IPv6 static routes - OSPFv3 - IS-IS for IPv6 - BGP4+ |
| Topic 3: Advanced BGP Features | 10% | - Advanced BGP features - Route reflectors - BGP route control - Inter-domain routing optimization |
| Topic 4: MPLS Technologies | 19% | - MPLS configuration - MPLS forwarding - MPLS VPN applications - MPLS principles |
| Topic 5: Network O&M | 7% | - Data collection - Routine maintenance |
| Topic 6: Network Cutover | 7% | - Basic cutover concepts - Migration process |
| Topic 7: Advanced Ethernet Technologies | 10% | - Ethernet security - VLANs |
| Topic 8: Network Troubleshooting | 10% | - Structured troubleshooting processes - Troubleshooting methods |
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NEW QUESTION # 238
On the OSPF network shown in the figure, drag the values on the left to the correct positions so that the traffic from PC1 to PC2 is sent along the path PC1 # R1 # R3 # R2 # PC2, and the traffic from PC2 to PC1 is sent along the path PC2 # R2 # R1 # PC1.
Answer:
Explanation:
Explanation:
# Objective:
* Asymmetric routing via OSPF cost manipulation
* PC1 to PC2 must go through: R1 # R3 # R2
* PC2 to PC1 must go through: R2 # R1
# Step-by-Step Cost Logic:
* Path PC1 # R1 # R2 (direct path) must be less preferred than PC1 # R1 # R3 # R2# Therefore, make Cost A (R1-R2) high (least preferred)# Set A = 50
* Path PC1 # R1 # R3 # R2 should be preferred# Cost = C (R1-R3) + 10 (R3-R2)# Set C = 30, so total =
30 + 10 = 40, which is less than 50
* From PC2 to PC1, we want to use R2 # R1# So R2 must see R1 as best next-hop to PC1# Ensure B (R2-R3) + C is higher than A# Set B = 10, so B + C = 10 + 30 = 40, which is more than A = 50 only if C were higher (which it isn't), but in reverse direction it's fine because R2 will still prefer direct 10 over B + 10 = 40.
# Final Answer Summary:
Label
Value
A
50
B
10
C
30
Official Huawei Extract:
" In OSPF, routing decisions are made based on cost. By manipulating interface costs, you can influence directional path selection (asymmetric routing). Lower total cost equals higher preference. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Cost and Path Selection]
NEW QUESTION # 239
A network engineer uses the capture-packet tool to capture the message received by the interface. The figure shows some output information. It is known that the message is a message of a dynamic routing protocol. Then the protocol is ().
Answer:
Explanation:
BGP
NEW QUESTION # 240
On the BGP/MPLS IP VPN network shown in the figure, which of the following RT settings can enable Sitel and Site2 to communicate with Site3?
Answer: A,C,D
Explanation:
A PE imports a VPNv4 route only when at least one RT attached to that route matches an Import RT configured in the receiving VPN instance. Bidirectional communication therefore requires reciprocal matching:
* Site1/Site2 ERT must match Site3 IRT.
* Site3 ERT must match Site1/Site2 IRT.
Evaluation of the displayed configurations:
* Option A - Correct: All PEs export and import 100:1. All three sites import one another's routes, providing full-mesh communication.
* Option B - Incorrect: PE1 exports 200:1, but PE3 imports only 100:1; PE3 exports 200:1, but PE1 imports only 100:1. Consequently, Site1 and Site3 cannot exchange routes bidirectionally.
* Option C - Correct: Site1 exchanges routes with Site3 through RT 100:1, while Site2 exchanges routes with Site3 through RT 200:1. PE3 imports and exports both RTs. This supports Site1-to-Site3 and Site2-to-Site3 communication while maintaining separate RT groups for Site1 and Site2.
* Option D - Correct: PE1 and PE2 export 200:1, which PE3 imports. PE3 exports 100:1, which PE1 and PE2 import. This is a valid hub-and-spoke RT design with Site3 functioning as the hub.
Huawei specifies that one site's Export RT must match the other site's Import RT, and the reverse matching must also exist for bidirectional communication. Huawei BGP/MPLS IP VPN configuration guide
NEW QUESTION # 241
In the OSPFV3 network shown in the figure, OSPFv3 is enabled on the interconnected ports of R1, R2, and R3, and IPv6 global unicast addresses are configured. R1 and R3 are DRs, so both R1 and R3 will generate Intra Area-Prefix-LSA.
Answer: B
NEW QUESTION # 242
On the network shown in the figure, OSPF runs on R1, R2, and R3, and R1 and R3 use loopback interfaces to establish an IBGP peer relationship. BFD is enabled in the BGP process. The minimum interval for sending BFD packets is 1000 ms, the minimum interval for receiving BFD packets is 1000 ms, and the detection multiplier is 6. If OSPF is disabled on GE0/0/1 of R2 using the undo network x.x.x.x y.y.y.y command, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
Answer: A
Explanation:
Bidirectional Forwarding Detection (BFD) provides rapid connectivity-failure detection independently of BGP ' s normal Keepalive and Hold timers.
In this topology, R1 and R3 establish an IBGP relationship through loopback interfaces, with R2 providing intermediate connectivity through OSPF.
Disabling OSPF on R2 ' s GE0/0/1 interface disrupts the routing information required to maintain the end-to- end IBGP connection. Once BFD packets can no longer reach the peer, the BFD detection timer determines when the session failure is reported.
The configured detection interval is 1000 milliseconds, and the detection multiplier is 6.
Therefore, the detection period is:
\[ 1000\text{ ms}\times6=6000\text{ ms}=6\text{ s} \]
BFD can notify BGP of the failure without waiting for the normal BGP Hold timer to expire. The intended answer is D.
NEW QUESTION # 243
......
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