Computer Architecture And Organization Set 12

Computer Science Engineering (CSE)

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This set of Computer Architecture and Organization Multiple Choice Questions & Answers (MCQs) focuses on Computer Architecture And Organization Set 12

Q1 | An alternative to JavaScript on windows platform is                
  • vbscript
  • asp.net
  • jsp
  • php
Answer: vbscript
Explaination:
vbscript is a general-purpose,
Q2 | A DNS client is called                    
  • dns updater
  • dns resolver
  • dns handler
  • none of the mentioned
Answer: dns resolver
Explaination:
dns client also known as dns resolver also known as dns lookup helps to resolve dns requests using an external dns server.
Q3 | Servers handle requests for other domains
  • directly
  • by contacting remote dns server
  • it is not possible
  • none of the mentioned
Answer: by contacting remote dns server
Explaination:
whenever a request is received at server from other domains, it handles this situation by contacting remote dns server.
Q4 | DNS database contains                
  • name server records
  • hostname-to-address records
  • hostname aliases
  • all of the mentioned
Answer: all of the mentioned
Explaination:
domain name system not only deals with mapping ip addresses with the hostname but also deals with exchange of information in the server.
Q5 | If a server has no clue about where to find the address for a hostname then                
  • server asks to the root server
  • server asks to its adjcent server
  • request is not processed
  • none of the mentioned
Answer: server asks to the root server
Explaination:
root name servers are actually very important and critical as they are the first step in translating human readable hostnames
Q6 | Which one of the following allows client to update their DNS entry as their IP address change?
  • dynamic dns
  • mail transfer agent
  • authoritative name server
  • none of the mentioned
Answer: dynamic dns
Explaination:
dynamic dns or in short ddns or dyndns helps in automatically updating a name server in the dns. this does not require manual editing.
Q7 | Wildcard domain names start with label
  • @
  • *
  • &
  • #
Answer: *
Explaination:
a wildcard dns record matches requests to a non existent domain name. this wildcard dns record is specified by using asterisk “*” as the starting of a domain name.
Q8 | The right to use a domain name is delegated by domain name registers which are accredited by                
  • internet architecture board
  • internet society
  • internet research task force
  • internet corporation for assigned names and numbers
Answer: internet corporation for assigned names and numbers
Explaination:
the icann (internet corporation for assigned names and numbers) deals with ip address space allocation, protocol identifier assignment, generic and country code top level domain name system management (gtld and cctld).
Q9 | The domain name system is maintained by
  • distributed database system
  • a single server
  • a single computer
  • none of the mentioned
Answer: distributed database system
Explaination:
a domain name system is maintained by a distributed database system. it is a collection of multiple, logically interrelated databases distributed over a computer network.
Q10 | Which one of the following is not true?
  • multiple hostnames may correspond to a single ip address
  • a single hostname may correspond to many ip addresses
  • a single hostname may correspond to a single ip address
  • none of the mentioned
Answer: a single hostname may correspond to a single ip address
Explaination:
it need not be that a single hostname will correspond to a ip address. for example facebook.com and fb.com both correspond to same ip address. so there can be multiple hostnames for a single ip address.
Q11 | Simple mail transfer protocol (SMTP) utilizes                    as the transport layer protocol for electronic mail transfer.
  • tcp
  • udp
  • dccp
  • sctp
Answer: tcp
Explaination:
since tcp is a reliable protocol, it’s more efficient to use tcp protocol for e-mail transfer. tcp also provides more security than other transport layer protocols.
Q12 | SMTP connections secured by SSL are known as                            
  • smtps
  • ssmtp
  • snmp
  • starttls
Answer: smtps
Explaination:
ssmtp is a simple mail transfer program to send mail from a local pc to a mail host. snmp is a network management protocol. starttls connections are secured by tls.
Q13 | SMTP uses which of the following TCP port?
  • 22
  • 23
  • 21
  • 25
Answer: 25
Explaination:
port 21 is used for ftp control connection, port 22 is used by ssh, and port 23 is used by telnet.
Q14 | Which one of the following protocol is used to receive mail messages?
  • smtp
  • post office protocol (pop)
  • internet message access protocol (imap)
  • ftp
Answer: ftp
Explaination:
ftp is used to share files. smtp, pop and imap are the protocols used to send and receive mails on the internet.
Q15 | What is on-demand mail relay (ODMR)?
  • protocol for smtp security
  • an smtp extension
  • protocol for web pages
  • protocol for faster mail transfer
Answer: an smtp extension
Explaination:
odmr is an extension to smtp, in which mails are relayed to the receivers after they are authenticated. it
Q16 | An SMTP session may not include
  • zero smtp transaction
  • one smtp transaction
  • more than one smtp transaction
  • one http transaction
Answer: one http transaction
Explaination:
an smtp session can only include smtp transactions regardless the number. any other protocol’s transaction is not included in an smtp session.
Q17 | SMTP defines                
  • message transport
  • message encryption
  • message content
  • message password
Answer: message transport
Explaination:
as the name suggests, simple mail transfer protocol is only responsible for “how” the message is transferred i.e.
Q18 | Which layer is responsible for process-to- process delivery?
  • physical layer
  • network layer
  • transport layer
  • application layer
Answer: transport layer
Explaination:
the transport layer is responsible for process-to-process delivery, error control and flow control. it provides an interface for the implementation of process to process delivery through ports. there are 65,535 port numbers.
Q19 | 6 INTRODUCTION TO PEER TO PEER NETWORKS
  • client/server
  • source/destination
  • message transfer
  • peer to peer
Answer: client/server
Explaination:
the most common method used for this communication is client/server. the client requests a service through a particular port number to the port of the server using its socket address. then the server responds by giving the requested service to the client port.
Q20 | Multiple processes on destinations at transport layer are identified by                      
  • mac address
  • port number
  • host number
  • host address
Answer: port number
Explaination:
multiple processes on destinations are identified by a transport layer address also called as port number. the ip address along with the port number is called the socket address.
Q21 | According to Internet Assigned Numbers Authority (IANA), which of the following ranges is not a part of port number ranges?
  • well-known ports
  • registered ports
  • dynamic ports
  • static ports
Answer: static ports
Explaination:
iana divided port numbers into three ranges i.e., well-known, registered and dynamic ports. well-known port numbers range from 0 to 1023, registered port numbers are from 1024 to 49151 and dynamic port numbers are from 49152 to 65535.
Q22 | The combination of an IP address and port number is called as                  
  • socket address
  • port address
  • mac address
  • host address
Answer: socket address
Explaination:
socket address is the combination of an ip address and a port number and it is used to define the client-end and server-end processes uniquely.
Q23 | Which of the following is false with respect to Connectionless service of transport layer protocol?
  • packets are not numbered
  • packets are not delayed
  • no acknowledgement
  • packet may arrive out of sequence
Answer: packets are not delayed
Explaination:
there is a high probability in connectionless services like udp that the packet gets delayed or lost because there is no connection made between the two end nodes. no connection means that there is no unique pathway for the packets to travel.
Q24 | In transport layer, Multiplexing is done at
  • channel
  • receiver site
  • sender site
  • packet
Answer: sender site
Explaination:
at the sender’s side, there are multiple processes which may want to send packets. but there is only one transport layer protocol like tcp or udp working at a time. so the transport layer protocol gets the messages from these processes and separates them with different port numbers. this process is called multiplexing and it is done before sending packets to the receivers side.
Q25 | The process of error checking and dropping of the header, delivering messages to appropriate process based on port number is called as                
  • delivery of packets
  • error correction
  • multiplexing
  • demultiplexing
Answer: demultiplexing
Explaination:
demultiplexing is the process of error checking and dropping of the header, delivering messages to appropriate process based on port number. the transport layer does this on the receiver’s end after the packet is received and takes help of the header attached by the sender’s side transport layer during multiplexing.
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