Refer to the exhibit. A network engineer finds that PC1 is accessing the hotel website to do the booking but fails to make payment. Which action resolves the issue?
A.
Increase the AD to 200 of static route 192.168.94.0 on R3.
B.
Configure a reverse route on R1 for PC1 172.16.1.0/24.
C.
Decrease the AD to 5 of OSPF route 192.168.94.0 on R1.
D.
Allow stub network 10.10.202.168/30 on router R3 OSPF.
Since the Bank routes are in stub area (which blocks type 4 & 5 LSA), it won't be able to receive R3 redistributed static route into OSPF, thus R1 is not able to communicate back to R3. Two options are envisageable:
- configure a reverse static route on R1 back to R3
- configure the Bank router area as Regular or NSSA area which allow redistributed routes to come in.
You are correct. What's interesting is R3 will have a DEFAULT route back out. Totally stubs have a default route for OIA/IA. Stubs have a default route for external LSA's. However if the static route to 10.10.202.168 through PC1 (as shown in image) is not redistributed into OSPF then R2 may not know where to route the return traffic. in this case a reverse route is best.
I was unable to find any Cisco documentation on a reverse route just being used standalone on a router outside of a VPN tunnel (reverse route injection). I think possibly if B was worded as "Configure a static route on R1...". Either way it does not correct the issue that the IP Route to 10.10.202.168 shows as a static route back to PC1's network of 172.16.1.0/24. The answer should be A.
The stub networks are not 'stub area' but network types in the Type 1 LSA from R1.which are interfaces advertised by the OSPF process but are not adjacent to another OSPF router. Question doesn't make sense.
There are no stub area's. All routers are in Area 0. Area 0 can't be made a stub. Lab it and try it. If R1 was in another Area (1) and R2 had an interface in Area 1 for R1 to have a connection to the backbone, then the command on R3 (sh ip ospf data router 10.10.202.169) wouldn't show up in Area 0 as it does. The stub networks are a loopback and the network connecting to the Banks server. I did lab this and had no problem pinging the Bank server even with the erroneous static route on R3 to R1's loopback network. Another very bad and technically unsound question.
I would say A, based on the topology that all three router are in the same Stub area 120.
Increasing the static route AD would make sure to use the route that is display in DB router command which is good.
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