CompTIA Cloud+ Practice Test

What should be investigated if unusual responses are received from a web server located on a reclaimed subnet?

1. DHCP

2. Orphaned services

3. Stale network access control lists

4. DNS

The correct answer is: DNS

Investigating unusual responses from a web server located on a reclaimed subnet should focus on DNS. When a subnet is reclaimed, there may be overlapping IP addresses or misconfigured DNS records that could lead to incorrect routing of requests. If the DNS records have not been updated or if duplicate DNS entries exist for the same IP addresses, clients may receive inconsistent or unpredictable responses when attempting to access the web server. DNS may also cache outdated information, and if the reclaimed subnet was previously in use, clients may still have entries active in their DNS cache, leading to improper routing and unusual server responses. Addressing DNS configurations helps ensure that traffic is being directed to the correct server and resolves issues of connectivity that stem from misconfigured or stale DNS data. While DHCP could play a role if the reclamation affected dynamic IP allocation, it is less relevant in this context unless there are specific issues with IP assignments. Orphaned services might cause problems but are not directly linked to the responses from a web server in a reclaimed subnet. Stale network access control lists could potentially lead to access issues, but they would not directly influence the responses returned from the web server as much as DNS issues. Hence, focusing on DNS will provide the necessary insights to troubleshoot and resolve the unusual behavior