Computer Networks Lecture 5: Introduction to Web Pages and HTTP Protocol
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Questions and Answers

What is the role of the HTTP protocol?

  • Transferring web objects between client and server (correct)
  • Resolving DNS queries
  • Creating sockets for TCP connections
  • Translating host names to IP addresses

    • Which protocol runs at port 80 at the transport layer?

  • TCP
  • DNS
  • UDP
  • HTTP (correct)

    • What does a web page consist of?

  • TCP connections and HTTP messages
  • Base HTML-file and referenced objects (correct)
  • DNS and Unified Resource Locator (URL)
  • Host name and IP address

    • What is the purpose of the Domain Name System (DNS)?

    <p>Translating host names to IP addresses (B)</p> Signup and view all the answers

    What is the TCP 3-Way Handshake used for?

    <p>Establishing TCP connections (B)</p> Signup and view all the answers

    What is the role of the proxy server in web caching?

    <p>Storing copies of web objects to serve future requests faster (A)</p> Signup and view all the answers

    What is the characteristic of HTTP in terms of its state?

    <p>It is stateless with no information about past client requests (B)</p> Signup and view all the answers

    What is the Round Trip Time (RTT) in the context of the HTTP protocol?

    <p>Time for a small packet to travel from client to server and back (B)</p> Signup and view all the answers

    What is the main difference between Non-Persistent and Persistent HTTP connections?

    <p>Length of time each connection remains open (C)</p> Signup and view all the answers

    What is an advantage of Non-Persistent HTTP Connections?

    <p>Opening connection only when there is data to be sent (C)</p> Signup and view all the answers

    What is a disadvantage of Non-Persistent HTTP Connections?

    <p>Increased CPU overhead for data transmission (A)</p> Signup and view all the answers

    What type of HTTP connection is most commonly used by modern browsers like Chrome and Firefox?

    <p>Pipelined Persistent Connection (C)</p> Signup and view all the answers

    In Non-Persistent Without parallel connection, how many Round Trip Times (RTTs) are taken for each object?

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

    What is the main advantage of Persistent HTTP Connections over Non-Persistent ones?

    <p>Reduced CPU overhead for data transmission (A)</p> Signup and view all the answers

    In Pipelined Persistent Connection, how many Round Trip Times (RTTs) are taken for all the objects?

    <p>= 1 RTT (C)</p> Signup and view all the answers

    What does HTTP stand for?

    <p>(B)</p> Signup and view all the answers

    What is the main role of Simple Mail Transfer Protocol (SMTP) in the electronic mail process?

    <p>Responsible for the connection between mail servers (B)</p> Signup and view all the answers

    Which port does SMTP use to transfer email messages?

    <p>Port 25 (B)</p> Signup and view all the answers

    What is the main responsibility of a user agent in the electronic mail process?

    <p>Composing, editing, and reading mail messages (D)</p> Signup and view all the answers

    In the electronic mail process, what does a mail server do?

    <p>Reliably transferring email messages on port 25 (A)</p> Signup and view all the answers

    What is the primary function of a user agent in the electronic mail process?

    <p>Composing, editing, and reading mail messages (C)</p> Signup and view all the answers

    What protocol is responsible for the connection between mail servers in the electronic mail process?

    <p>SMTP (D)</p> Signup and view all the answers

    What is the role of SMTP in email communication?

    <p>Sending and storing emails on the receiver's mail server (A)</p> Signup and view all the answers

    Which protocol is primarily used for retrieving emails from the mail server?

    <p>POP (A)</p> Signup and view all the answers

    What is the main characteristic of POP (Post Office Protocol)?

    <p>Stateless across sessions (B)</p> Signup and view all the answers

    Which port does SMTP use for email communication?

    <p>25 (A)</p> Signup and view all the answers

    What is the primary purpose of IMAP (Internet Mail Access Protocol)?

    <p>Retrieving emails from the mail server (A)</p> Signup and view all the answers

    In email communication, which protocol is primarily used for sending and storing emails on the receiver's mail server?

    <p>SMTP (B)</p> Signup and view all the answers

    What is a characteristic of SMTP messages?

    <p>Commands and responses are both written in 7-bit ASCII format (B)</p> Signup and view all the answers

    Which protocol uses persistent connections in email communication?

    <p>SMTP (C)</p> Signup and view all the answers

    What separates the header lines from the body in an SMTP message?

    <p>'DATA' (C)</p> Signup and view all the answers

    Which protocol supports keeping all messages in one place at the server?

    <p>IMAP (D)</p> Signup and view all the answers

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