A client requests an HTML file that references four other ob…
A client requests an HTML file that references four other objects, all on a server, accessible via the Internet. HTTP/1.1 with the persistent mode is used. Any request satisfied by the client’s organization-level DNS or Web cache takes 0 ms. For requests that need to go on the Internet, the following delays are observed. A DNS query that is not served by the DNS cache takes 6 ms. The HTML file and each object request referenced in the file take 5 ms each to transmit from the server. The round-trip time (RTT) to the server is 1 ms. The transmission times of TCP segments with no data or containing only HTTP GET or status messages are ignored. The time required by the client to process the HTML file and issue requests for the objects referenced therein is negligible. Assuming that the client’s browser initiates the GET request at time 0 seconds, calculate the following. The organization’s DNS cache and the Web cache that serve the client are empty. The client’s browser cache is empty. The client’s TCP initiates the TCP connection request at the time [1] ms. The client sends the HTTP GET request at the time [2] ms. The client receives the HTML file, but not the four objects referenced in it, at time [3] ms. The client receives the first of the four objects referenced in the HTML file at the time [4] ms. The client receives all four objects referenced by the file at the time [5] ms.
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Consider a router buffer preceding an outbound link that has a transmission capacity of 1000 packets/second. Assume that the router is operating in a steady-state with no packet losses. Suppose packets arrive at the router an average rate of 600 packets/second to use the outbound link.Calculate the following values. The traffic intensity is [1]. A packet uses the outbound link for [2] seconds. The average delay (queuing and transmission) experienced by a packet is [3] seconds. The average number of packets in the router waiting to use or using the outbound link is [4].
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