During a security incident, the security operations team identified sustained network traffic from a malicious IP address: 10.1.4.9. A security analyst is creating an inbound firewall rule to block the IP address from accessing the organizationβs network. Which of the following fulfills this request?
- Aaccess-list inbound deny ip source 0.0.0.0/0 destination 10.1.4.9/32
- Baccess-list inbound deny ip source 10.1.4.9/32 destination 0.0.0.0/0 (correct answer)
- Caccess-list inbound permit ip source 10.1.4.9/32 destination 0.0.0.0/0
- Daccess-list inbound permit ip source 0.0.0.0/0 destination 10.1.4.9/32
Reveal answer & explanationHide answer
The correct answer is B. Option B: access-list inbound deny ip source 10.1.4.9/32 destination 0.0.0.0/0
Explanation
Network address translation maps addresses between networks and commonly lets private hosts share public connectivity. This option keeps traffic private / properly secured as required.