Cisco Certified Internetwork Expert (CCIE) Practice Test

What is one function of the ingress command in the context of IDS configuration?

1. The encapsulation command is used for deep scan on dot1q encapsulation traffic

2. Traffic will not be able to pass on gigabitEthernet 0/1

3. The ingress command is used for an IDS to send a reset on VLAN 3 only

4. Traffic will only be sent to gigabitEthernet 0/20

The correct answer is: The ingress command is used for an IDS to send a reset on VLAN 3 only

The function of the ingress command in the context of Intrusion Detection System (IDS) configuration is centered around how the IDS interacts with network traffic. Using the ingress command typically specifies actions for incoming traffic on a specific interface or VLAN. In this case, by indicating that the IDS will send a reset on VLAN 3 only, the ingress command helps to direct the IDS's response to specific network events or malicious activities detected on that particular VLAN. This targeted response is crucial for maintaining network integrity and responding effectively to threats by not just monitoring but also reacting appropriately to specific traffic flows detected on the network. While other choices suggest varying functions, they do not accurately represent the primary role of the ingress command within the IDS context. For example, discussing traffic flow on specific GigabitEthernet interfaces or making claims about encapsulation may address other network functionalities but detracts from the direct purpose of how the ingress command positions the IDS to act on identified threats in the network. Thus, the focus on VLAN 3 within the correct answer underscores how the ingress command is utilized for efficient threat management in a defined scope of the network.