Palo Alto Networks Certified Network Security Administrator (PCNSA)Palo Alto Networks Security PlatformMedium
A network operations team is installing a Palo Alto Networks firewall to protect a highly sensitive internal server farm. The team wants to ensure that all traffic entering and exiting this server farm is inspected by the firewall, but they cannot introduce any IP address changes or modify the existing network topology. Which deployment mode meets these constraints while providing full security inspection?
- ALayer 3 Mode
- BTap Mode
- CVirtual Wire Mode
- DSubinterface Mode
Show answer & explanationAnswer & explanation
Correct answer: C. Virtual Wire Mode
Virtual Wire mode allows the Palo Alto Networks firewall to be transparently inserted into an existing network segment without requiring any changes to IP addressing or routing. It functions as a 'bump in the wire,' providing full security inspection (Layer 2 through Layer 7) while being invisible to the network.
Why the other options are wrong
- A. Layer 3 mode acts as a router and would require IP address and routing changes.
- B. Tap mode only monitors traffic passively and does not enforce security policies or block traffic.
- D. Subinterface mode is a configuration option for interfaces, not a deployment mode that dictates transparency or IP changes.
Virtual Wire Mode
A transparent deployment mode for Palo Alto Networks firewalls where it functions as a 'bump in the wire' at Layer 2, without requiring changes to IP addressing or routing.
- Invisible to the network.
- Provides full Layer 2-7 inspection.
- Ideal for sensitive segments or gradual deployments.
Memory trick: Virtual Wire is like an invisible security guard standing directly in the pathway.