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Router 2 advertises the network 192.168.3.0/24 to router R1 via IS-IS.
How can router R1 ensure that it discards the route?
Use a prefix list on router R1 to discard all ingress IS-IS routes.
Use an export policy and prefix list on router R1.
Use an import policy and a prefix list on router R1.
This is not possible because IS-IS cannot use import policies.
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