A researcher is comparing the differences between a stateless firewall and a proxy firewall. Which two additional layers of the OSI model are inspected by a proxy firewall? (Choose two.)

A researcher is comparing the differences between a stateless firewall and a proxy firewall. Which two additional layers of the OSI model are inspected by a proxy firewall? (Choose two.)

• Layer 3
• Layer 4
• Layer 5
• Layer 6
• Layer 7
  

  Answers Explanation & Hints: Packet filtering firewalls are usually part of a router firewall, which permits or denies traffic based on Layer 3 and Layer 4 information. They are stateless firewalls that use a simple policy table look-up that filters traffic based on specific criteria.