IT3010 Network Design and Management Lecture 03 Quiz

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Questions and Answers

What is the standard model for developing network applications?

Client-Server model

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

DHCP (Dynamic Host Configuration Protocol)

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

Offering services

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

Waiting for requests from clients Signup and view all the answers

Which application layer protocol resolves domain names to IP addresses?

DNS (Domain Name System) Signup and view all the answers

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

Bidirectional reliable connection Signup and view all the answers

What is the purpose of caching DNS responses?

To provide quick responses for repeated translations Signup and view all the answers

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

By the owner of the data Signup and view all the answers

Why are negative DNS queries cached?

To avoid repeating past mistakes like misspellings Signup and view all the answers

How does DNS handle reliability with replicated servers?

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

Why is UDP used for DNS queries instead of TCP?

To allow trying alternate servers on timeout Signup and view all the answers

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

Dynamically distribute network configuration parameters like IP addresses Signup and view all the answers

What does the DNS message format consist of?

12 bytes Name, type fields for a query Signup and view all the answers

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

Matching up request and response Signup and view all the answers

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

An IP address Signup and view all the answers

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

A name server record Signup and view all the answers

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

Query or response marking Signup and view all the answers

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

Defining value associated with type Signup and view all the answers

What is the responsibility of root name servers?

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

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

Link applications to local name servers Signup and view all the answers

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

Iterative query Signup and view all the answers

How does a recursive query differ from an iterative query?

It only returns final answers or 'not found' Signup and view all the answers

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

Answering queries about local zones for local hosts Signup and view all the answers

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

128.2.218.81 Signup and view all the answers

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

<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> Signup and view all the answers

Which of the following statements about domain names is true?

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

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

In the 'cmu' node Signup and view all the answers

What is a zone in the context of DNS design?

A contiguous section of the name space Signup and view all the answers

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

Through a zone transfer of the name space using TCP Signup and view all the answers

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