One of your team members has asked you to analyze the following SOA record. What is the TTL? Rutgers.edu.SOA NS1.Rutgers.edu ipad.college.edu (200302028 3600 3600 604800 2400.

The correct answer is D. 2400. A SOA (Start of Authority) record contains five numeric fields in parentheses, in this fixed order: (Serial, Refresh, Retry, Expire, Minimum TTL). Breaking down the record 'Rutgers.edu. SOA NS1.Rutgers.edu ipad.college.edu (200302028 3600 3600 604800 2400)': Serial=200302028…

Footprinting and Reconnaissance

Question

Options

A200303028
B3600
C604800
D2400
E60
F4800

How the community answered

(46 responses)

A
4% (2)
B
2% (1)
D
83% (38)
E
2% (1)
F
9% (4)

Explanation

A SOA (Start of Authority) record contains five numeric fields in parentheses, in this fixed order: (Serial, Refresh, Retry, Expire, Minimum TTL). Breaking down the record 'Rutgers.edu. SOA NS1.Rutgers.edu ipad.college.edu (200302028 3600 3600 604800 2400)': Serial=200302028, Refresh=3600, Retry=3600, Expire=604800, Minimum TTL=2400. The last field, 2400 seconds, is the Minimum TTL (also used as the negative caching TTL). This tells resolvers how long to cache a negative response (NXDOMAIN) for names in this zone.

Topics

#DNS#SOA record#minimum TTL#zone records

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