The WebSocket protocol provides a way to exchange data between browser and server via persistent connection. Once the socket is created, there are events following that. Analyze all the FOUR (4) events and provide a code snippet of every event.
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The WebSocket protocol provides a way to exchange data between browser and server via persistent connection. Once the socket is created, there are events following that. Analyze all the FOUR (4) events and provide a code snippet of every event.
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- An instance of ServerSocket listens for TCP connection requests and creates a new Socket instance to handle each incoming connection. Select one: True FalseQUESTION 21 It is possible for two UDP segments to be sent from the same socket with source port 5723 at a server to two different clients. True False QUESTION 22 The acronym API in this textbook stands for “Application programming interface”. True FalseSuppose 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.
- Let's pretend Host C is running a Web server on port 80. Suppose this Web server allows both Hosts A and B to make persistent connections. Is it possible that Host C is sending several requests over the same socket? Does port 80 exist in each of these connections if they are being sent through separate sockets? You should discuss and elaborate on this.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?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?
- Let's pretend Host C is running an HTTP server on port 80. Consider that this Web server allows both Host A and Host B to establish persistent connections. Does Host C always send requests using the same socket? Does port 80 exist on both ends if they travel across separate sockets? You ought to discuss and elaborate on the matter.4. [Socket] What is a socket? Suppose a process in Host C has a UDP socket with port number6789. Suppose both Host A and Host B send a UDP segment to Host C with destination portnumber 6789. Will both segments be directed to the same socket at Host C? If so, how will theprocess at Host C know that these two segments originated from two different hosts? 5. [Demultiplex] Define multiplexing and demultiplexing. Briefly explain how TCP demultiplexing isdifferent than UDP demultiplexing. 6. [rdt] Consider a reliable data transfer protocol that uses only negative acknowledgments.Suppose the sender sends data only infrequently. Would a NAK-only protocol be preferable to aprotocol that uses ACKs? Why? Now suppose the sender has a lot of data to send and the end-to-end connection experiences few losses. In this second case, would a NAK-only protocol bepreferable to a protocol that uses ACKs? Why?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.…
- Servers can be designed to limit the number of open connections. A typical example, a server may wish to have only N socket connections at any point in time. As soon as N connections are made, the server will not accept another incoming connection until an existing connection is released. 4.3 How can you ensure that a binary semaphore is implemented in the above scenario?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?Your task is to create a sequencer-based multicasting service, using a slight variant of the simple version of the Amoeba protocol (the first protocol described in www.cdk3.net/coordination), and a small client application to exercise it. You will use Java RMI and multicast sockets. The main classes in your implementation will be: TestSequencer.java – each instance (you will create several) will allow the user to enter strings and multicast them to a group of instances of TestSequencer. TestSequencer will also be capable of “stress-testing” – multicasting messages as fast as possible. Group.java – TestSequencer uses an instance of Group for group communication services. Group in turn uses a MulticastSocket to receive incoming messages, and uses RMI to the sequencer for sending messages and other, sequencer-specific operations Sequencer.java, SequencerImpl.java – the interface to and implementation of a sequencer. History.java – the implementation of the sequencer's history.…