Which of these values specify how long a DNS response can be cached in a local DNS cache? Group of answer choices Expiration period Refresh rate Retry interval Time to live 1 day after receipt of the DNS response
Added by Kevin A.
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- Expiration period: This term is not specific to DNS caching and could refer to various types of data expiration. - Refresh rate: This term is not specific to DNS caching and could refer to how often a system or service checks for updates. - Retry interval: This Show more…
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Akash M.
Suppose within your Web browser, you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that n DNS servers are visited before your host receives the IP address from DNS. The successive visits incur an RTT of RTT1, RTT2,..., RTTn. Further suppose that the Web page associated with the link contains exactly one object, consisting of a large amount of HTML text. Let RTTo denote the RTT between the local host and the server containing the object. Assuming a transmission duration of 0.002 * RTTo of the object, how much time elapses from when the client clicks on the link until the client receives the object?
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