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The Cisco switch must be configured to have all inactive layer 3 interfaces disabled.


Finding ID Version Rule ID IA Controls Severity
V-220991 CISC-RT-000060 SV-220991r622190_rule Low
An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. Unauthorized personnel with access to the communication facility could gain access to a switch by connecting to a configured interface that is not in use. If an interface is no longer used, the configuration must be deleted and the interface disabled. For sub-interfaces, delete sub-interfaces that are on inactive interfaces and delete sub-interfaces that are themselves inactive. If the sub-interface is no longer necessary for authorized communications, it must be deleted.
Cisco IOS XE Switch RTR Security Technical Implementation Guide 2023-09-13


Check Text ( C-22706r408767_chk )
Review the switch configuration and verify that inactive interfaces have been disabled as shown below:

interface GigabitEthernet3
no switchport
interface GigabitEthernet4
no switchport

If an interface is not being used but is configured or enabled, this is a finding.
Fix Text (F-22695r408768_fix)
Disable all inactive interfaces as shown below:

SW1(config)#interface GigabitEthernet3
SW1(config)#interface GigabitEthernet4