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Within the IP properties on your Windows-based computer you have specified a primary and secondary DNS server. Under what circumstances will the local client send requests to the secondary DNS server?

If the primary server does not respond to a request within 10 seconds

If the primary server does not respond to a request within 100 seconds

If the primary server redirects the client to the secondary

When the primary server is unavailable

Explanation

DHCP and DNS Attacks

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