IT3010 Network Design and Management Lecture 03 Quiz
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Questions and Answers

What is the standard model for developing network applications?

  • Server-Server model
  • Client-Server model (correct)
  • Peer-to-Peer model
  • Client-Client model

    • Which protocol is responsible for assigning IP addresses dynamically on a network?

  • FTP (File Transfer Protocol)
  • DHCP (Dynamic Host Configuration Protocol) (correct)
  • STP (Spanning Tree Protocol)
  • DNS (Domain Name System)

    • What is the main function of a server in a network?

  • Initiating connections
  • Hiding network interfaces
  • Offering services (correct)
  • Requesting services

    • In the client-server model, what is the role of the server process?

    <p>Waiting for requests from clients</p> Signup and view all the answers

    Which application layer protocol resolves domain names to IP addresses?

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

    What kind of connection does the dominant model for data exchange over networks operate with?

    <p>Bidirectional reliable connection</p> Signup and view all the answers

    What is the purpose of caching DNS responses?

    <p>To provide quick responses for repeated translations</p> Signup and view all the answers

    How is the lifetime (TTL) of cached data controlled?

    <p>By the owner of the data</p> Signup and view all the answers

    Why are negative DNS queries cached?

    <p>To avoid repeating past mistakes like misspellings</p> Signup and view all the answers

    How does DNS handle reliability with replicated servers?

    <p>Name service is available if at least one replica is up</p> Signup and view all the answers

    Why is UDP used for DNS queries instead of TCP?

    <p>To allow trying alternate servers on timeout</p> Signup and view all the answers

    What is the main purpose of Dynamic Host Configuration Protocol (DHCP)?

    <p>Dynamically distribute network configuration parameters like IP addresses</p> Signup and view all the answers

    What does the DNS message format consist of?

    <p>12 bytes Name, type fields for a query</p> Signup and view all the answers

    What is the purpose of the Identification field in DNS Header Fields?

    <p>Matching up request and response</p> Signup and view all the answers

    In the DNS Record RR format, what does 'type = A' represent?

    <p>An IP address</p> Signup and view all the answers

    What does the 'Type = NS' signify in the 'IN' class of DNS Record?

    <p>A name server record</p> Signup and view all the answers

    What does the 'Flags' field in DNS Header represent?

    <p>Query or response marking</p> Signup and view all the answers

    What is the purpose of the 'Class' field in DNS Record RR format?

    <p>Defining value associated with type</p> Signup and view all the answers

    What is the responsibility of root name servers?

    <p>Handle queries when local name servers can't resolve a name</p> Signup and view all the answers

    What is the role of a resolver in the context of DNS?

    <p>Link applications to local name servers</p> Signup and view all the answers

    Which type of query involves the server providing as much information as it knows?

    <p>Iterative query</p> Signup and view all the answers

    How does a recursive query differ from an iterative query?

    <p>It only returns final answers or 'not found'</p> Signup and view all the answers

    In DNS, what is the primary function of local name servers?

    <p>Answering queries about local zones for local hosts</p> Signup and view all the answers

    What does the domain name 'provolone.crcl.cs.cmu.edu' map to?

    <p>128.2.218.81</p> Signup and view all the answers

    Which of the following domain names map to the same IP address?

    <p><a href="http://www.scs.cmu.edu">www.scs.cmu.edu</a> and <a href="http://www.cs.cmu.edu">www.cs.cmu.edu</a></p> Signup and view all the answers

    Which of the following statements about domain names is true?

    <p>A single domain name can map to multiple IP addresses</p> Signup and view all the answers

    Where would the domain name 'Amal.cmu.edu' be stored according to the DNS hierarchy?

    <p>In the 'cmu' node</p> Signup and view all the answers

    What is a zone in the context of DNS design?

    <p>A contiguous section of the name space</p> Signup and view all the answers

    How are secondary/redundant name servers updated in a DNS zone?

    <p>Through a zone transfer of the name space using TCP</p> Signup and view all the answers

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