1Z0-404 Question #3: Real Exam Question with Answer & Explanation

Question

Options

• Athey span multiple networks and provide edge proxy functions between them
• Bthey are session-aware devices that enable control of end-to-end interactive communications across
• Cthey enable premium interactive services across IP network borders by complementing existing edge
• Dthey provide routing functions for IP, TCP, and SMTP using application parameters.
• Ethey replace typical edge routers and firewalls in order to provide a unified network border for signaling

Explanation

A is correct because SBCs physically and logically span network boundaries, acting as edge proxies that mediate signaling (e.g., SIP) and media between two or more networks - this is their defining architectural role. C is correct because SBCs specifically complement existing edge infrastructure (firewalls, routers) to enable premium real-time services like VoIP and video across IP network borders, rather than replacing those devices.

B is a distractor that sounds plausible but is vague and incomplete - while SBCs are session-aware, the phrase "end-to-end interactive communications" describes general VoIP/UC concepts, not a specific SBC function; it omits the border/proxy aspect that defines them. D is wrong because routing IP, TCP, and SMTP via application parameters describes a Layer 7 application-aware router or proxy, not an SBC - SBCs don't handle SMTP (email) at all. E is wrong because SBCs complement edge routers and firewalls, not replace them; replacing them would be a unified threat management (UTM) device or next-gen firewall.

Memory tip: Think of SBC as a "border guard at the network frontier" - it sits between networks (→ A) and adds premium capabilities alongside existing guards, not replacing them (→ C). If an answer says SBCs replace or handle email, it's wrong.

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