Examkin

Question

Difficulty: MediumMicrosoft Command-Line Tools

A network administrator is troubleshooting an issue on a Windows workstation where recent DNS record updates on the domain controller are not taking effect locally, preventing connection to an internal application server. The administrator must clear all cached host name resolution entries and force the workstation to dynamically re-register its IP address and computer name with the DNS server. Which of the following command-line commands should the administrator execute to complete these tasks? (Select TWO.)

  1. ipconfig /flushdnsAnswer
  2. ipconfig /registerdnsAnswer
  3. C
    ipconfig /renew
  4. D
    systemd-resolve --flush-caches

Answer

The correct commands to execute are ipconfig /flushdns to purge the local DNS cache and ipconfig /registerdns to initiate re-registration of the host records with the DNS server.
Executing the command stating 'ipconfig /flushdns' clears out all saved local domain name query results from memory, forcing Windows to send fresh queries to the network DNS server. Executing the command stating 'ipconfig /registerdns' forces the local client computer to immediately re-register its host name and IP address settings with its configured DNS server.

Step-by-Step Solution

1
Identify the command required to clear stale DNS resolver cache entries on Windows.
The ipconfig /flushdns command empties the Windows DNS resolver cache.
Stale DNS cache entries prevent the OS from querying the DNS server for newly updated IP mappings.
2
Identify the command required to initiate dynamic registration of host records with the DNS server.
The ipconfig /registerdns command sends dynamic update requests to the DNS server.
This forces the client to refresh its resource records (A/AAAA) with DNS without restarting the computer.

Key Concept

Windows TCP/IP DNS Configuration Utility Switches
Estimated Time:1m 15s
Rate this question

Topics

Microsoft Command-Line Tools

More questions from this topic