If DNS searching happens once every 10 minutes, and each time the HTTP file references 8 items, how long until non-persistent HTTP and no concurrent TCP connections expire?
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- If DNS searching happens once every 10 minutes, and each time the HTTP file references 8 items, how long until non-persistent HTTP and no concurrent TCP connections expire?How much time does Non-persistent HTTP and no concurrent TCP connections expire if DNS searching up occurs once per 10 minutes, and each time the HTTP file mentions 8 objects?If DNS looks up occur every 10 minutes and the HTTP file references 8 items each time, how long would Non-persistent HTTP and no concurrent TCP connections last?
- If a DNS lookup happens every 10 minutes and an HTTP file references 8 objects each time, how long would Non-persistent HTTP with no concurrent TCP connections last?DNS makes use of UDP rather than TCP. If a DNS packet is dropped, there is no way to recover automatically. Is this a problem, and if so, how does one go about resolving it?Computer Science: True or False. "With no persistent connections between browser and origin server, it is possible for a single TCP segment to carry two distinct HTTP request messages."
- 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 three DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTT = 4 msecs. The second and third DNS servers contacted have RTTs of 45 and 24 msecs, respectively. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP = 9 msecs. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? (Do not forget the TCP handshake(s).) 82 msecs O 91 msecs O 46 msecs O 67 msecsWhat is the difference between network applications and application layer protocols? Both HTTP and FTP can be used for downloading and uploading files. Give one similarity and one difference between the two protocols. What is the purpose of the IF-MODIFIED-SINCE field in an HTTP GET message?Download delays for 100 objects (HTTP 1.1 with browser caching). Consider an HTTP 1.1 client and server. The RTT delay between the client and server is 2 seconds. Suppose the time a server needs to transmit an object into its outgoing link is 3 seconds, as shown below for the first of these 100 requests. initiate TCP connection RTT request file RTT file received time You can assume that any other HTTP message not containing an object sent by the client and server has a negligible (zero) transmission time. Suppose the client makes 100 requests, one after the other, waiting for a reply to a request before sending the next request. 352 secs Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object, assuming the client uses the IF- MODIFIED-SINCE header line, and 50% of the objects requested have not changed since the client downloaded them (before these 100 downloads are performed)? 350 secs 252 secs time to…
- Obtain the HTTP/1.1 specification (RFC 2616). Answer the following questions: a. Explain the mechanism used for signaling between the client and server to indicate that a persistent connection is being closed. Can the client, the server, or both signal the close of a connection? b. What encryption services are provided by HTTP? c. Can a client open three or more simultaneous connections with a given server? d. Either a server or a client may close a transport connection between them if either one detects the connection has been idle for some time. Is it pos- sible that one side starts closing a connection while the other side is transmitting data via this connection? Explain.Obtain the HTTP/1.1 specification (RFC 2616). Answer the following questions: a. Explain the mechanism used for signaling between the client and server to indicate that a persistent connection is being closed. Can the client, the server, or both signal the close of a connection? b. What encryption services are provided by HTTP? c. Can a client open three or more simultaneous connections with a given server? d. Either a server or a client may close a transport connection between them if either one detects the connection has been idle for some time. Is it possible that one side starts closing a connection while the other side is transmitting data via this connection? Explain.There are 4 routers Router A, B, C and D Router B and D are connected in a network system, RIP is the routing protocol running on the routers, DV(distance vector) algorithm is the routing algorithm for RIP, a new link is added to the system to conect router A and C, will this addition trigger router A to re-compute its DV?