On the OSPF network shown in the figure, an adjacency has been established between R1 and R2. An engineer configures the commands in the figure on R2. In this case, which of the following routing entries may exist in the routing table of R2?
On R2 , the following configuration has been applied:
acl 200
rule deny source 10.1.0.0 0.0.3.0
rule permit
#
ospf 1
filter-policy 2000 import
This configuration uses ACL 200 to filter routes during import into the OSPF routing table on R2.
Rule deny source 10.1.0.0 0.0.3.0: Blocks routes in the range 10.1.0.0/24 to 10.1.3.0/24 (inclusive).
Rule permit: Allows all other routes to be imported.
Impact of ACL 200 on Route Import:
10.1.0.0/24 to 10.1.3.0/24: These subnets are explicitly denied by ACL 200 and will not appear in R2 ' s routing table.
10.1.4.0/24 and beyond: These subnets are permitted by the rule permit statement and will be imported into R2 ' s routing table.
Routing Table Entries on R2:
Option A (10.1.4.0/24): Exists in R2 ' s routing table because it is permitted.
Option B (10.1.3.0/24): Does not exist because it is denied by ACL 200.
Option C (10.1.2.0/24): Does not exist because it is denied by ACL 200.
Option D (10.1.1.0/24): Does not exist because it is denied by ACL 200.
A (10.1.4.0/24)
[References:, HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering, Huawei ACL Configuration for Route Policies, , , ]
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