In the following figure, OSPF is enabled on all router interfaces. The IP addresses marked in the figure belong to Loopback0 of the routers. The Loopback0 addresses of R1 and R2 are advertised in Area 1, the Loopback0 address of R4 is advertised in Area 0, and the Loopback0 addresses of R3 and R5 are advertised in Area 2. Given this, which of the following IP addresses can ping each other?
Correct Answer: C
Understanding OSPF Multi-Area Routing #OSPF (Open Shortest Path First) is a link-state routing protocolthat uses ahierarchical area designfor scalability. #OSPF Areas in the Diagram: Area 0 (Backbone Area):ContainsR4 (Loopback 10.0.4.4/32). Area 1:ContainsR1 (Loopback 10.0.1.1/32) and R2 (Loopback 10.0.2.2/32). Area 2:ContainsR3 (Loopback 10.0.3.3/32) and R5 (Loopback 10.0.5.5/32). R1 and R2 connect Area 1 to Area 0. R1 and R3 connect Area 1 to Area 2. How OSPF Advertises Routes Across Areas #Intra-area communication (within the same area) is always possible. #Inter-area communication is possible if the ABR (Area Border Router) correctly advertises routes. #OSPF does NOT automatically advertise routes from one non-backbone area (e.g., Area 2) to another (e.g., Area 0) unless explicitly allowed. Analysis of the Answer Choices: #A. 10.0.3.3 and 10.0.5.5 (Incorrect) Both R3 (10.0.3.3) and R5 (10.0.5.5) are inArea 2. R3 and R5 can communicate directly, but OSPF rules require an Area Border Router (ABR) to share routing information between areas. Since no information is provided about inter-area route redistribution, we cannot confirm that R3 and R5 can reach each other. #B. 10.0.2.2 and 10.0.5.5 (Incorrect) R2 (10.0.2.2) is in Area 1, and R5 (10.0.5.5) is in Area 2. R2 does NOT have direct OSPF reachability into Area 2. #C. 10.0.2.2 and 10.0.3.3 (Correct) R2 (10.0.2.2) is in Area 1, and R3 (10.0.3.3) is in Area 2. R1 connects both Area 1 and Area 2, meaning R2 and R3 can communicate via R1. R1 is the ABR (Area Border Router) between Area 1 and Area 2, so it will advertise routes from R3 to R2 and vice versa. #D. 10.0.4.4 and 10.0.2.2 (Incorrect) R4 (10.0.4.4) is in Area 0 (Backbone), and R2 (10.0.2.2) is in Area 1. R2 does NOT connect directly to Area 0, soR2 does not learn routes from Area 0 unless R1 explicitly redistributes them. No explicit information about route redistribution is provided. C: (10.0.2.2 and 10.0.3.3) #Reference:Huawei HCIE-Datacom Guide - OSPF Multi-Area Routing & ABR Role Real-World Application: Enterprise WAN Networks:Multi-area OSPF is used toscale large enterprise networkswhile maintainingfast convergence. Service Provider Networks:ABRs control route distribution, preventingunnecessary flooding of routing updates across areas.
Question 68
The correct description of the extended features of ISIS is ?
Correct Answer: A,C,D
Question 69
All interfaces of the router have OSPF enabled, the Cost value of the link is identified in the figure, and the Loopback0 socket for R2 is advertised in area 1 , then Rl reaches 10022/32 with a Cost value of ?
Correct Answer: D
Question 70
Is the following description of the differences between IGMP name versions correct?
