Both PIX and ASA are Cisco Stateful firewalls with latter being the latest market entrant including increased feature support and performance.

Comparison Table: PIX vs ASA

Below table enlists the difference between both the PIX and ASA –

S No	PIX	ASA
1	Firewall appliance	Is firewall and anti-malware security appliance
2	Physical Appliance	Physical and Virtual Appliance
3	Provides Stateful packet filtering firewall.	Provides following feature support Advertisements ·Firewall ·IPS ·Anti-X ·VPN
4	Use PIX Device Manager (PDM) for a graphical interface.	Use Adaptive Security Device Manager (ASDM) for a graphical interface.
5	Does not support WebVPN	Supports WebVPN
6	Does not support Transparent Firewall, Security Context and Modular Policy	Supporting Transparent Firewall, Security Context and Modular Policy
7	16 MB Ram	64 MB
8	Runs PIX OS	Runs Security appliance Code 7.0 and later
9	Lower in performance and throughput	Higher performance and throughput

Download the comparison table here.

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Stateful vs Stateless Firewall

In case you are preparing for your next interview, then please go through our e-book on Cisco ASA Firewall Interview Questions & Answers in easy to understand PDF Format explained with relevant Diagrams (where required) for better ease of understanding.