Data Communication and Computer Network
Questions and Answers 21 to 30
21.
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HTTP
(Hyper Text Transfer Protocol) has similarities to both of the following
protocols
(a) FTP; SMTP (b) FTP; SNMP
(c) FTP; MTV (d) FTP; URL (e) SMTP; SNMP
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What
is the bit combination used by the SAPI field of ISDN’s data link layer, to
control call for end-to-end signaling in LAPD addressing format?
(a) 000000 (b) 000010 (c) 010000 (d)
000001 (e) 111111.
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Which
category of AAL of ATM is intended to support connection-oriented data
services?
(a) AAL1 (b) AAL2 (c) AAL3 (d) AAL4 (e) AAL5.
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In
the process of congestion control, the bits FECN and BECN of frame relay
protocol are useful to
(a) Warn sender and
receiver of congestion in the network respectively
(b) Warn receiver
and sender of congestion in the network respectively
(c) Warn only
receiver of congestion in the network respectively
(d) Warn only sender
of congestion in the network respectively
(e) Indicate the congestion
but no warning to either sender or receiver is given
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MIME
allows what type of data to be sent through SMTP?
(a) Audio (b) Non-ASCII data
(c) Image (d) Video (e) All of the above.
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Which
of the following application protocol is a framework for managing devices in
an internet using the TCP/IP protocol suite.
(a) SMTP (b) SNMP (c) FTP (d) TELNET (e) HTTP.
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Which
of the following component of SMTP can transform non-SMTP mail to SMTP format
and vice versa.
(a) mail spool (b) mail gateway (c) mail file
(d) mail exchanger (e) none of the above.
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What
names objects, defines the type of data that can be stored in an object, and
encodes data for network transmission.
(a) MIB (b) SMI (c) SNMP (d) ASN.1 (e) BER .
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Flow
Control in data communications
(a) Can be
implemented using a CSMA/CD Protocol
(b) Makes a channel
an error-free one.
(c) Can be
implemented using a Stop-and-Wait Protocol
(d) Cannot be
implemented on a simplex link
(e) None of the
above.
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Which
of the following is not correct regarding the Simple Mail Transfer Protocol
(SMTP) and Post Office Protocol3 (POP3)?
(a) SMTP delivers
email by having the source machine establish a TCP connection to port 25 of
the destination machine
(b) SMTP and
POP3 are simple one ASCII protocols
(c) POP3 uses the
port 20 by default to establish a connection
(d) POP3 is used for
fetching email from a remote mailbox
(e) SMTP provides
for mail exchange between users on the same or different computers.
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Answers
21.
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Answer : (a)
Reason : HTTP
functions like a combination of FTP and SMTP . It is similar to FTP because
it transfers files and uses the services of TCP. However , it is much simpler
than FTP because it uses only one TCP connection. HTTP is like SMTP because the data
transferred between the client and the server look like SMTP messages.
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Answer : (d)
Reason: 000001
bit combination used by the SAPI field of ISDN’s data link layer, to
control call for end-to-end signaling in LAPD addressing format.
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Answer : (c)
Reason : AAL3
of ATM is intended to support connection-oriented data services.
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Answer : (b)
Reason : In
the process of congestion control, the bits FECN and BECN of frame relay protocol
are useful to Warn receiver and sender of congestion in the network
respectively.
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Answer : (e)
Reason : MIME
allows audio, non-ASCII , video and image of data to be sent through SMTP.
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Answer : (b)
Reason : SNMP
(Simple Network Management Protocol) is a framework for managing devices in
an internet using the TCP/IP protocol suite.
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Answer : (b)
Reason : Mail
gateway is the component of SMTP can transform non-SMTP mail to SMTP format
and vice versa.
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Answer : (b)
Reason : SMI is the names objects, defines the type of data that
can be stored in an object, and encodes data for network transmission.
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Answer : (c)
Reason : Flow
Control in data communications can be implemented using a Stop-and-Wait
Protocol
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Answer : (c)
Reason : POP3
uses the port 20 by default to establish a connection is not correct
regarding the Simple Mail Transfer Protocol (SMTP) and Post Office Protocol3
(POP3).
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