Question 250
At the Oakport national logistics provider, two departments share a physical subnet but require distinct access decisions by device role. Which explanation best accounts for the concern?
Explanation
Correct Answer
The problem stems from the fact that subnet-only policy cannot express differing device trust roles within the same network. A correct solution would apply Cisco TrustSec security group tagging and enforced policy where supported and check that a denied source group cannot reach a restricted destination group on the shared subnet.
Incorrect Answers
The offered principle is: Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked. In the source material it is associated with: Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked. This case has a different controlling cause: Subnet-only policy cannot express differing device trust roles within the same network. Its keyed mechanism is: Subnet-only policy cannot express differing device trust roles within the same network.
The offered principle is: Different authentication secrets prevent peers from proving a common trust relationship. In the source material it is associated with: Different authentication secrets prevent peers from proving a common trust relationship. This case has a different controlling cause: Subnet-only policy cannot express differing device trust roles within the same network. Its keyed mechanism is: Subnet-only policy cannot express differing device trust roles within the same network.
Address translation can alter reachable endpoint addresses without changing the authenticated gateway identity. That may occur elsewhere, but the evidence at the Oakport national logistics provider instead points to the fact that subnet-only policy cannot express differing device trust roles within the same network.