When a firewall acts as an application-level gateway (ALG), what does it require in order to establish a connection?

The correct answer is B. Payload. An ALG is designed to inspect and modify the payload of application-layer protocols (like SIP, FTP, etc.) to manage dynamic port allocations and session information. Application Layer Gateways (ALGs) inspect the payload of certain protocols to dynamically manage sessions that use

Application Identification and Control

Question

Options

ADynamic IP and Port (DIPP)
BPayload
CSession Initiation Protocol (SIP)
DPinholes

How the community answered

(50 responses)

A
4% (2)
B
80% (40)
C
4% (2)
D
12% (6)

Explanation

An ALG is designed to inspect and modify the payload of application-layer protocols (like SIP, FTP, etc.) to manage dynamic port allocations and session information. Application Layer Gateways (ALGs) inspect the payload of certain protocols to dynamically manage sessions that use dynamic port assignments. By modifying payloads, the ALG ensures that NAT and security policies are correctly applied.

Topics

#ALG#application-level gateway#payload inspection#session establishment

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