Application Layer 2-18: HTTP Overview Quiz
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Questions and Answers

What is the primary goal of the application layer in computer networking?

  • To secure the network from cyber attacks
  • To manage the physical network infrastructure
  • To implement advanced encryption algorithms
  • To provide a conceptual understanding of network application protocols (correct)

    • Which of the following is NOT a network application listed in Chapter 2?

  • File Transfer Protocol (FTP)
  • Voice over IP (e.g., Skype)
  • Web
  • Database Management Systems (DBMS) (correct)

    • What is the primary function of DNS in the context of network applications?

  • To provide secure authentication for users
  • To encrypt data during transmission
  • To optimize network bandwidth usage
  • To translate domain names to IP addresses (correct)

    • Which type of network application protocol follows the client-server paradigm?

    <p>Email (SMTP, POP3, IMAP)</p> Signup and view all the answers

    What is the main purpose of the socket API in creating network applications?

    <p>To facilitate communication over the network</p> Signup and view all the answers

    Which of the following is an example of a peer-to-peer application?

    <p>File sharing through BitTorrent</p> Signup and view all the answers

    What does HTTP stand for?

    <p>Hypertext Transfer Protocol</p> Signup and view all the answers

    In the client/server model, what role does the browser play?

    <p>Receives and displays Web objects</p> Signup and view all the answers

    What port does the HTTP server typically listen on?

    <p>Port 80</p> Signup and view all the answers

    How many RTTs (Round-Trip Times) are required for each object in non-persistent HTTP?

    <p>2 RTTs</p> Signup and view all the answers

    What is one of the drawbacks of non-persistent HTTP?

    <p>Requires 2 RTTs per object</p> Signup and view all the answers

    What does persistent HTTP allow in terms of TCP connections?

    <p>Leaves connection open after sending response</p> Signup and view all the answers

    What is included in an HTTP request message?

    <p>Request line and header lines</p> Signup and view all the answers

    What method type can be used to upload form input to a server?

    <p>POST</p> Signup and view all the answers

    What does the status code '404 Not Found' indicate?

    <p>Requested document not found on this server</p> Signup and view all the answers

    What is typically done to open a TCP connection to a Web server using Telnet?

    <p>Typing a GET HTTP request followed by a Host field with appropriate values.</p> Signup and view all the answers

    What command can be used to open a TCP connection to port 80 at cis.poly.edu?

    <p>telnet cis.poly.edu 80</p> Signup and view all the answers

    How is an object's presence or absence in the response message indicated?

    <p>Header fields</p> Signup and view all the answers

    What does the browser do after receiving the IP address from DNS?

    <p>Initiates a TCP connection to the HTTP server process located at port 80</p> Signup and view all the answers

    In a pure P2P architecture, what is a characteristic of peers?

    <p>Arbitrary end systems directly communicate</p> Signup and view all the answers

    What is the function of a tracker in BitTorrent?

    <p>Tracks peers participating in the torrent</p> Signup and view all the answers

    What is the first step when a client wants the IP for www.amazon.com using DNS?

    <p>Client queries root server to find com DNS server</p> Signup and view all the answers

    What happens when a peer joins a torrent in BitTorrent?

    <p>Registers with tracker to get list of peers and connects to subset of peers</p> Signup and view all the answers

    What is the role of DNS in the process of initiating a TCP connection to an HTTP server?

    <p>Resolving the domain name to an IP address</p> Signup and view all the answers

    What is an example of a P2P application according to the text?

    <p>File distribution (BitTorrent)</p> Signup and view all the answers

    What does a peer do once it has accumulated all file chunks in BitTorrent?

    <p>(Selfishly) leaves or (altruistically) remains in torrent</p> Signup and view all the answers

    What is the primary function of DNS servers according to the text?

    <p>(Resolving domain names to IP addresses)</p> Signup and view all the answers

    (True/False) Peers in a pure P2P architecture are always centrally connected to a main server.

    Signup and view all the answers

    In the context of Web caching, what is the goal of a proxy server?

    <p>To satisfy client requests without involving the origin server</p> Signup and view all the answers

    What is one of the primary reasons for Web caching?

    <p>To reduce response time for client requests</p> Signup and view all the answers

    What is the function of the FTP server port 21?

    <p>To initiate the TCP control connection with the FTP client</p> Signup and view all the answers

    What does SMTP stand for in the context of electronic mail?

    <p>Simple Mail Transfer Protocol</p> Signup and view all the answers

    What are the three major components of electronic mail?

    <p>User agents, mail servers, and mail access protocols</p> Signup and view all the answers

    What does DNS stand for in the context of domain name system?

    <p>Domain Name System</p> Signup and view all the answers

    What protocol is typically used for retrieval from the mail server?

    <p>POP: Post Office Protocol</p> Signup and view all the answers

    What is the primary function of DNS in network applications?

    <p>To communicate to resolve names (address/name translation)</p> Signup and view all the answers

    '404 Not Found' status code in HTTP indicates:

    <p>'Document not found'</p> Signup and view all the answers

    What protocol is used between mail servers to send email messages?

    <p>SMTP: Simple Mail Transfer Protocol</p> Signup and view all the answers

    What is one of the drawbacks of non-persistent HTTP?

    <p>Increased network congestion due to multiple connections per object</p> Signup and view all the answers

    What is the primary function of the socket API in creating network applications?

    <p>To facilitate communication between processes within the same host</p> Signup and view all the answers

    What does the status code '404 Not Found' indicate?

    <p>The requested resource was not found on the server</p> Signup and view all the answers

    What transport service does an app need if it requires 100% reliable data transfer?

    <p>Reliable data transfer</p> Signup and view all the answers

    What is the primary goal of the application layer in computer networking?

    <p>To enable the exchange of data between applications running on different hosts</p> Signup and view all the answers

    Which type of network application protocol follows the client-server paradigm?

    <p>SMTP</p> Signup and view all the answers

    In a pure P2P architecture, what is a characteristic of peers?

    <p>Peers are intermittently connected and change IP addresses</p> Signup and view all the answers

    Which of the following is an example of a peer-to-peer application?

    <p>BitTorrent</p> Signup and view all the answers

    What does persistent HTTP allow in terms of TCP connections?

    <p>It allows for a single TCP connection to be used for multiple requests and responses</p> Signup and view all the answers

    What does a peer do once it has accumulated all file chunks in BitTorrent?

    <p>It begins sharing its accumulated file chunks with other peers</p> Signup and view all the answers

    How many RTTs (Round-Trip Times) are required for each object in non-persistent HTTP?

    <p>2 RTTs</p> Signup and view all the answers

    What does the browser do after receiving the IP address from DNS?

    <p>It sends an HTTP request to the server</p> Signup and view all the answers

    What is included in an HTTP request message?

    <p>The requested resource's content type and size</p> Signup and view all the answers

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