CISSP · Question #1060
CISSP Question #1060: Real Exam Question with Answer & Explanation
The correct answer is B: Update Domain Name System (DNS) server addresses with domain registrar.. DNS updates are typically the longest process due to propagation time. When you change DNS records (such as updating the IP address of the web server or modifying the DNS server addresses), it can take anywhere from minutes to 48 hours for the changes to fully propagate across th
Question
An organization's retail website provides its only source of revenue, so the disaster recovery plan (DRP) must document an estimated time for each step in the plan. Which of the following steps in the DRP will list the GREATEST duration of time for the service to be fully operational?
Options
- AUpdate the Network Address Translation (NAT) table.
- BUpdate Domain Name System (DNS) server addresses with domain registrar.
- CUpdate the Border Gateway Protocol (BGP) autonomous system number.
- DUpdate the web server network adapter configuration.
Explanation
DNS updates are typically the longest process due to propagation time. When you change DNS records (such as updating the IP address of the web server or modifying the DNS server addresses), it can take anywhere from minutes to 48 hours for the changes to fully propagate across the internet. This delay occurs because DNS resolvers worldwide cache DNS records, and updates must propagate to all of them. In a disaster recovery scenario, if you're recovering a website and need to point the domain to a new server, you'll have to wait for the DNS changes to propagate before users can reach the new web server. This is often the most time-consuming step in the recovery process.
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