Question

if dynamic dns is in use, which of the following events causes a dynamic update of the host records?

a. An MX record is added to the DNS server.
b. The DHCP server renews an IP address lease.
c. The DHCP server renews an IP address lease.
d. The browser cache on a workstation is cleared.

Answer 1

Option A is correct. An MX record is added to the DNS server.  use the ipconfig command to manually force an update of the client name registration in DNS.

Dynamic DNS (DDNS) is a technique for automatically updating name servers in the Domain Name System (DNS), frequently in real-time, with the configured hostnames, addresses, or other information that is currently active in the DDNS setup. Generally speaking, there is no need to modify your TTL. However, you might wish to alter your TTL in advance if you know you'll shortly be making a significant DNS change and you want the changes to take effect promptly.

Update your TTL to a shorter number at least 24 hours in advance. You could wish to adjust it to 3600, for instance (1 hour). To point domain names to a non-static IP address, use dynamic DNS (DDNS).

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