Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?
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Using HTTP 1.1, how much time elapses between the client transmitting the first request, and the receipt of the last requested object?
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- Consider a node called A that sends packets to an adjacent node called B. To control the packet flow to node B, node A employs a credit manager scheme in which parameters C=3(credits), C_max=4(credits) and \tao=6(msec), respectively. node A has an infinite buffer to temporarily store packets. When a packet arrives at node A, node A stores the packet at the bottom of the buffer. Node A also has a single server (transmitter). As soon as the server becomes idle, the server picks up a packet at the head of the buffer, if any, and serves the packet for packet transmission time T_p as far as there remains a credit. (The packet transmission time T_p = 4 (msec).) We observed the arrival times of the first 12 packets, denoted by aA(1)⋯A(12), which were as follows: n A(n) 1 0.5 msec 2 1.0 3 1.5 4 2.0 5 4.5 6 5.5 7 6.5 8 12.5 9 13.0 10 13.5 11 14.0 12 14.6 1. Let R(n) denote the departure time of the n th packet from the buffer for n∈{1,2,...}. Find R(n) for…Suppose an HTTP client makes a request to the gaia.cs.umass.edu web server. The client has never before requested a given base object, nor has it communicated recently with the gaia.cs.umass.edu server. You can assume, however, that the client host knows the IP address of gaia.cs.umass.edu. How many round trip times (RTTs) are needed from when the client first makes the request to when the base page is completely downloaded, assuming the time needed by the server to transmit the base file into the server's link is equal to 1/2 RTT and that the time needed to transmit the HTTP GET into the client's link is zero? (You should take into account any TCP setup time required before the HTTP GET is actually sent by the client, the time needed for the server to transmit the requested object, and any propagation delays not accounted for in these amounts of time.) Choices A.0.5 RTT B.3.5 RTT C.1.5 RTT D.2.5 RTT E.0 RTTWe explore whether either UDP or TCP offers any level of end-point authentication in this problem. a. Consider a server that accepts a request via UDP and responds via UDP (for example, as done by a DNS server). Where would the server give its answer if a client with IP address X spoofs it with address Y? b. Assume a server receives a SYN with IP source address Y and responds with SYNACK. The server then receives an ACK with IP source address Y and the right acknowledgmentamount. Assuming the server selects a random initial sequence number and there is no "man-in-the-middle," how can the server be confident that the recipient is really at Y (and not at any other address X that spoofs Y)?
- 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 localhost, 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, . . ., RTTn. Further suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Let RTT0 denote the RTT between the local host and the server containing the object. Assuming zero transmission time of the object, how much time elapses from when the client clicks on the link until the client receives the object? Justify your answer.A link between two hosts can really pack a punch, carrying a boatload of packets all at once. Please spill the beans and lay out a schedule that spells out all the ins and outs of the tasks required to wrap up a single shipment. Is it believed that one delay will take a set amount of time while the other delay's duration can be played around with?Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL isnot cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that n DNS servers arevisited before your host receives the IP address from DNS; the successive visits incur an RTT of RTT1, . . ., RTTn.Further suppose that the Web page associated with the link contains exactly one object, consisting of a small amount ofHTML text. Let RTT0 denote the RTT between the local host and the server containing the object. Assuming zerotransmission time of the object, how much time elapses from when the client clicks on the link until the client receivesthe object?
- In this programming assignment, you will implement a decentralized peer-to-peer network architec-ture (P2P), including the basic implementation of the BitTorrent protocol (BTP). General P2P architec-tures can be classified into centralized and decentralized, In P2P centralized architectures, new peers senda request to the Traker (normally done via HTTP) requesting a list containing all the IP addresses ofthe peers that are already connected to the P2P network sharing the same file. The tracker then, replieswith a response containing such list. In P2P decentralized architecture, each peer is also a Traker, and itcan share only limited resources because it only sees the partial network. On the other hand, P2P decen-tralized networks avoid single point of failure since they do not depend of centralized trackers. Examplesof P2P applications that are/were implementing centralizing architectures are Nasper, the Berkeley OpenNetwork Infrastructure (BOINC) and some versions of BitTorrent.…Write a java program(UDPAddServer) using UDP Sockets that would accept a packet containing two integer bytes sent by client, perform the sum of received bytes and return the result(sum) to clientIf 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?
- The problem below involves the UDP protocol.DescriptionClientSend an integer in the range 0 to 100 representing a student’s score in COMP2602 to the server.Use a loop to send five score to the server in all. Each score is sent one at a time so that theserver can respond to each score sent.ServerThe server receives each integer score from the client and returns the letter grade for that score tothe client where it is printed. Note: THE GRADE IS PRINTED AT THE CLIENT.Grade scheme 0-49 F, 50-70 C, 71-80 B, 81-100 AYou may use any reasonable IP addresses and port numbers in your program.Notes: Name the client client.py and the server server.pyConsider an HTTP client that wants to retrieve a Web document at a given URL. The IP address of the HTTP server is initially unknown. What transport and application-layer protocols besides HTTP are needed in this scenario?Assume we have a client using a web browser that is directly connected to a web server. We are assuming there is a direct link between the client and the server. The RTT delay between the client and the server is 10 msec. The time it takes the server to transmit an object to its outgoing link is 2 msec. Now suppose that the client has the web page that it wants already cached locally. But the user wants to constantly check for updates and sends conditional get requests one after the other 20 times -- that is, once it gets a response and/or the updated object it sends out the next request. If we are using persistent HTTP and the cached object is up-to-date 40% of the time, how much time will elapse between sending the first request and the completion of the last one?