NETWORKED COMPUTER SYSTEMS EXAM QUESTIONS AND ANSWERS

NETWORKED COMPUTER SYSTEMS
EXAM QUESTIONS AND ANSWERS
A browser requests an HTML document containing links for three images in an
environment where persistent connections are used.
A. Two connections will be needed, one for the HTML document and one for all the
images.
B. Four connections will be needed, one for the HTML document and one for each of
the images.
C. One connection will be needed. It will be used for the HTML document and all the
images. - Answer-C. One connection will be needed. It will be used for the HTML
document and all the images.

Computer networks consist of ____________, packet switches and communication
links. - Answer-end systems or hosts

The time delay needed for a bit travel from one end of a communication link to the other
end. - Answer-propagation

Delay incurred when a packet is waiting for previously arrived packets to be sent out on
the same outbound link. - Answer-queuing

Time delay needed to push a packet of bits onto the communications link. - Answer-
transmission

Internet protocol layer that is responsible for routing packets through the core network. -
Answer-network

Internet protocol layer responsible for delivering data from the sending
process/application to the destination process/application. - Answer-transport (Internet
protocol layer that includes the actual transmission medium.)

As a data packet moves down the Internet protocol stack, it increases in size.
True or False? - Answer-True, Encapsulation adds header information at the next lower
layer.

IMAP is an Internet Layer 5 protocol.
True or False? - Answer-True

A major reason for organizing protocols in layers is to decrease complexity.
True or False? - Answer-True, Protocol layers are a form of abstraction which hides the
complexity of the implementation at lower layers.

A single link using circuit switching can only service one connection at a time.

, True or False? - Answer-False

HTTP is a stateless protocol.
True or False? - Answer-True, State can be captured using cookies but the http protocol
is stateless.

Briefly describe the Store and forward concept. - Answer-All the bits of a packet must be
received and stored in router memory before the packet is forwarded on to the next
router in the path to the final destination.

Name the three things that a protocol defines. - Answer-1. format of messages
2. order of messages
3. actions taken on the transmission and/or receipt of a message or other event.

In what situation do packet-switched networks outperform circuit-switched networks? -
Answer-Where there is short, bursty network traffic.

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
A. Reliable data transfer between processes. - Answer-TCP

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
B. Minimum data transmission rate between processes. - Answer-Neither

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
C. Congestion-controlled data transfer between processes. - Answer-TCP

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
D. A guarantee that data will be delivered within a specified amount of time. - Answer-
Neither

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
E. Preserve application-level message boundaries. That is, when a sender sends a
group of bytes into a socket via a single send operation, that group of bytes will be
delivered as a group in a single receive operational at the receiving application. -
Answer-UDP

Which protocol, TCP or UDP (or both or neither) provide the following service to
applications:
F. Guaranteed in-order delivery of data to the receiver. - Answer-TCP