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An SOA record gathered from a zone transfer is shown here:

[tex]\begin{array}{l}
\text{IN SOA DNSRV1.anycomp.com. postmaster.anycomp.com.} \\
4 \text{; serial number} \\
3600 \text{; refresh [1h]} \\
600 \text{; retry [10m]}
\end{array}[/tex]

What is the name of the authoritative DNS server for the domain, and how often will secondary servers check in for updates?

A. DNSRV1.anycomp.com, every 3600 seconds
B. DNSRV1.anycomp.com, every 600 seconds
C. DNSRV1.anycomp.com, every 4 seconds
D. postmaster.anycomp.com, every 600 seconds

Answer :

To answer the question, let's break down the information provided in the SOA (Start of Authority) record:

1. Understanding the SOA Record:
- SOA Record: This type of DNS record provides information about the domain and the zone’s primary DNS server. It also includes timing values that dictate how often secondary DNS servers should check for updates.
- The Authoritative DNS Server: This is the primary DNS server responsible for the domain and is listed right after "IN SOA" in the record.

2. Extracting Information from the Record:
- The SOA record is as follows: `IN SOA DNSRV1.anycomp.com. postmaster.anycomp.com.`
- From this, we identify the authoritative DNS server as `DNSRV1.anycomp.com`.

3. Determining the Timing for Secondary Servers:
- The SOA record includes several timing values, including a refresh interval. This tells secondary DNS servers how often they should query the primary DNS server for updates.
- According to the provided information, the refresh interval is `3600` seconds.

4. Answering the Question:
- The authoritative DNS server for the domain is `DNSRV1.anycomp.com`.
- Secondary servers check in for updates every `3600` seconds.

Given this analysis, the correct answer to the question is:
A. DNSRV1.anycomp.com, every 3600 seconds

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Rewritten by : Jeany