Fill in the blanks: The Application Layer Firewalls inspect traffic through the ________ layer(s) of the TCP/IP model and up to and including the ________ layer.

Application Layer Firewalls perform deep packet inspection beginning at the lower layers of the TCP/IP model - specifically the Network Access and Internet layers - and extend inspection all the way up to and including the Application layer. This full-stack inspection is what distinguishes them from simpler packet-filtering firewalls that only examine lower-layer headers.

'First two; Internet' is incorrect because the Internet layer is the second layer in TCP/IP, meaning inspection would stop at IP addressing and routing, which does not reach the Application layer and does not describe an Application Layer Firewall.

'First two; Transport' is incorrect because stopping at the Transport layer describes a stateful inspection firewall, not an Application Layer Firewall, which must inspect up to the Application layer.

'Upper; Application' is incorrect because Application Layer Firewalls do not begin at upper layers - they inspect the full TCP/IP stack starting from the lower layers to gain complete session context.