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When a BOOTP server receives a request , the server looks up the computer in its database of information . If you turn the keyswitch straight from " off " to " system " ( on MDFS and HDFS machines ) , the server should start up in utility mode . The encoder converts audio ( or video ) content into a streaming format , the server makes the content available over the Internet , and the player ( on the end user 's machine ) retrieves the content . If all goes well , the server will receive the DHCPREQUEST and give the client permission to renew the lease . In public-key authentication , the server authenticates the user by the presence of the user 's public key in the user 's $ HOME / .