Question 230
At the Northport software engineering team, a host poisons gateway ARP entries on a switched VLAN and redirects traffic through itself. What risk should the team identify as the primary issue?
Explanation
Correct Answer
This identifies the root issue: forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked. At the Northport software engineering team, the team should therefore enable dynamic ARP inspection with valid DHCP snooping binding or static ARP ACL support.
Incorrect Answers
The offered action is: Subnet-only policy cannot express differing device trust roles within the same network. It is associated with this separate technical condition: Subnet-only policy cannot express differing device trust roles within the same network. The actual incident concerns a different dependency: Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked. The corresponding change is: Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked.
The offered alternative is: Successful authentication alone does not limit which privileged commands a user may run. It addresses this separate failure mode: Successful authentication alone does not limit which privileged commands a user may run. In the current case, the observed mechanism is: Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked. The keyed action, Forged ARP mappings can alter layer-two delivery when MAC to IP ownership is not checked., targets that condition more directly.
Centralized configuration can amplify unauthorized changes without an explicit approval gate. That is not the mechanism that accounts for the stated failure at the Northport software engineering team.