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</p> Signup and view all the answers

    What is the TCP 3-Way Handshake used for?

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

    What is a disadvantage of Non-Persistent HTTP Connections?

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

    What does HTTP stand for?

    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</p> Signup and view all the answers

    Which port does SMTP use to transfer email messages?

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

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

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

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

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

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

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

    Which port does SMTP use for email communication?

    <p>25</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</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</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</p> Signup and view all the answers

    Which protocol uses persistent connections in email communication?

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

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

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

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

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

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