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A penetration tester is performing DNS reconnaissance and has obtained the following output using different dig comrr ;; ANSWER SECTION company.com. 5 IN MX 10 mxa.company.com company.com. 5 IN- MX 10 mxb.company.com company.com. 5 IN MX 100 mxc.company.com ;; ANSWER SECTION company.com. 5 IN A 120.73.220.53 ;; ANSWER SECTION company.com. 5 IN NS nsl.nsvr.com Which of the following can be concluded from the output the penetration tester obtained?
Correct Answer: B
The output of the DNS query shows the TTL (Time to Live) value for the company.com record as 5. This means that the DNS record can be cached for five minutes before it needs to be refreshed from the authoritative DNS server. The TTL value indicates how long a DNS resolver is allowed to cache the query before it must query the authoritative server again. Reference: Understanding DNS TTL values: DNS TTL Interpretation of DNS dig output from various penetration testing engagements: Horizontall.