Comprehensive and Detailed In-Depth Explanation:
Understanding the OSPF Network Structure in the Question:
* OSPF Areas & Routers:
* Area 3: Contains R5 (which has loopback 10.0.5.5/32).
* Area 1: Contains R6.
* Area 2: Contains R4.
* Area 0 (Backbone Area): Contains R1, R2, and R3 (which interconnect the other areas).
* ACL 2000 Filtering Rule:
* The ACL rule 2000 explicitly denies 10.0.5.5/32 from being imported.
* The filter 2000 import command applies this filter to Area 0, preventing routes from Area 3 (including R5's loopback) from being learned by Area 0 routers (R1, R2, and R3).
Route Distribution Analysis:
* R5 (Area 3):
* R5 has 10.0.5.5/32 configured on its Loopback0.
* Since OSPF is enabled, R5 advertises the route to R6 in Area 1.
* R6 (Area 1) # R2 (Area 0, Backbone Router):
* Without filtering, R6 would normally propagate 10.0.5.5/32 to R2 (since R2 is a backbone router in Area 0).
* However, since ACL 2000 is applied in Area 0, R2 blocks this route from being imported.
* Therefore, R2 does not learn 10.0.5.5/32.
* R2 # R1 and R3 (Both in Area 0):
* R2 would typically share any learned routes with R1 and R3 in Area 0.
* But since R2 itself does not have 10.0.5.5/32, neither R1 nor R3 can receive it.
* Thus, R1 and R3 also do not have 10.0.5.5/32 in their routing tables.
* R4 (Area 2) is Unaffected:
* Since R4 is in Area 2, it is not directly impacted by the filter applied in Area 0.
* It can still receive the route via another path if redistribution is configured properly.
Final Conclusion:
* R1, R2, and R3 do not have the 10.0.5.5/32 route due to the filter 2000 import command applied in Area 0.
* R4 may still have the route since it is not affected by the filtering in Area 0.
Thus, the correct answer is:# R1, R3, R2 do not have the route 10.0.5.5/32 in their routing tables.