Refer to the exhibit.Which statement regarding the output is true?

Question 184 of 530 from exam 400-251: CCIE Security written exam

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Question

Refer to the exhibit.

$\Users> nslookup > set type=soa > cisco.com Server: dnel.abcompany.com Address: 2.3.4.5 responsible mail addr = postmaster.cisco.com serial = 10973831 refresh = 7200 (2 hours) retry = 1800 (30 mins) expire = 864000 (10 days) default TTL = 86400 (1 day) cigco.com nameserver = nel.cigco.com nel.cigco.com internet address = 72.163.5.201 ne2.cigco.com internet address = 64.102.255.44$

Which statement regarding the output is true?

Answers

A. Every 1800 seconds the secondary name server will query the SOA record of the primary name server for updates.

B. If the secondary name server has an SOA record with the serial number of 10973815, it will initiate a zone transfer on the next cycle.

C. Other DNS servers will cache records from this domain for 864000 seconds (10 days) before requesting them again.

D. Email queries concerning this domain should be sent to "admin@postmaster.cisco.com".

E. Both primary and secondary name servers will clear (refresh) their caches every 7200 seconds to ensure that up-to-date information is always in use.

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Explanations

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A. B. C. D. E.

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