H12-831_V1.0 무료 덤프문제 온라인 액세스

Which of the following statements are true about OSPFv3 Link-LSAs and Intra-Area-Prefix-LSAs?

• A.Each device generates an Intra-Area-Prefix-LSA for each link.
• B.Each device generates a Link-LSA for each link.
• C.A Link-LSA describes the link-local address and IPv6 prefix address on the link.
• D.The prefix information described by the Intra-Area-Prefix-LSA is associated with the Router-LSA or Network-LSA.

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.

정답:

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]

On the OSPFv3 network shown in the figure, the LSDB (Link-State Database) of R2 contains ______ Router-LSAs . (Enter only digits.)

The VPN1 route transmission path in the hub-spoke networking is shown in the figure. When Hub-PE forwards the route of VPN1 to Spoke^PE2, which of the following is true about the AS_Path attribute carried in the route?

• A.AS_Path=100
• B.AS_Path=65001, 100
• C.AS_Path=65001, 100,65002
• D.The AS_Path attribute is empty.

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 PC1 and PC2, respectively .
Given this, which of the following statements are true?

Network Topology:
* R1:
* Interface GE0/0/0 : 10.0.12.1/24 (Connected to R2)
* Interface GE0/0/1 : 192.168.1.1/24 (Gateway for PC1)
R2:
* Interface GE0/0/0 : 10.0.12.2/24 (Connected to R1)
* Interface GE0/0/1 : 192.168.1.2/24 (Gateway for PC2)
Options:

• A.R2 cannot ping 10.0.12.1.
• B.PC1 and PC2 cannot ping each other.
• C.R1 cannot ping 192.168.1.2.
• D.R1 cannot ping 192.168.1.12.