300-720 Question #9: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which SPF record is valid for mycompany.com?

Options

• Av=spf1 a mx ip4:199.209.31.2 -all
• Bv=spf1 a mx ip4:10.1.10.23 -all
• Cv=spf1 a mx ip4:199.209.31.21 -all
• Dv=spf1 a mx ip4:172.16.18.230 -all

Explanation

{"question_number": 2, "question": "Refer to the exhibit. Which SPF record is valid for mycompany.com?", "correct_answer": "C. v=spf1 a mx ip4:199.209.31.21 -all", "explanation": "An SPF (Sender Policy Framework) record must list the actual public IP address of the authorized outbound mail server for the domain. In the referenced exhibit, 199.209.31.21 is the legitimate public/external IP address assigned to mycompany.com's mail server. Option B (10.1.10.23) is a private RFC 1918 address and should not appear in a public DNS SPF record. Option D (172.16.18.230) is also a private address. Option A (199.209.31.2) is a public IP but does not match the correct server address shown in the exhibit. The '-all' mechanism means all senders not listed are unauthorized (hard fail).", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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