Computer Networks(Dcis 121) (Dbit 223) Question Paper

Computer Networks(Dcis 121) (Dbit 223)

Course:Computer Information Systems And Business Information Technology

Institution: Kenya Methodist University question papers

Exam Year:2012

TIME : 2 HOURS

Instructions:
Answer question one and any other two questions.
Question one
Define a computer network.
(2mks)
State and briefly explain any two benefits of computer networks to an individual.
(4mks)
State four guided media types used in computer networks.
(4mks)
Briefly describe the following terms as used with computer networks:
Topology
Protocol
Network service
Routing
Packet
(10mks)
Distinguish between the following concepts.
(4mks)
Distinguish topology and logical topology
Connection oriented service and connectionless service.
State and briefly describe three application layer protocols.
(6mks)

Questions Two
Give four types of computer networks when classified on the basis of scope and size.
(4mks)
With the help of a well labeled diagram, describe the TCP/IP four layer protocol stack, giving one protocol per layer.
(12mks)
Briefly describe how acknowledgements are used to implement reliable services.
(2mks)
Define flow control as used in computer networks.
(2mks)

Question Three
State and briefly explain the three types of network standards. (6mks)
Briefly describe the two parts of an IPV4 address.
(4mks)
Distinguish between static routing and dynamic routing.
(2mks)
State three components of a satellite transmission system.
(3mks)
State five network topologies.
(5mks)

Question Four
The user datagram protocol is the unreliable entity at the TCP/IP transparent layer. Give three situations where UDP is the preferred protocol to use.
(3mks)
State the two functions of ICMP at the network layer.
(2mks)
State four ICMP messages.
(4mks)
Give two advantages and one disadvantage of the twisted pair compare to fiber optic table.
(3mks)
State two routing protocols.
(2mks)
State and briefly explain any three types of routing algorithms. (6mks)

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