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Computer Networks Exam 1 Ch 1- Foundations Questions with Complete Solutions
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Computer Networks Exam 1 Ch 1- Foundations Questions with Complete Solutions
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Computer Networks Exam 1 Ch 1-Foundations Questions with Complete
Solutions
3 Computer Network perspectives (general) - Answer-Application Programmer
Network Operator
Network Designer
Application Programmer Perspective (specific) - Answer-Would list the services that
their application needs
(message transfer, connection switching)
Network Operator (specific) - Answer-Would list the characteristics of a system that is
easy to administer and manage
(which faults can be isolated, new devices can be added and configured to network,
easy to account for usage)
Network Designer Perspective (specific) - Answer-Would list the properties of a cost-
effective design
(that network resources are efficiently utilized and fairly allocated to different users,
issues of performance)
Computer Network Requirements (general) - Answer-Scalable Connectivity
Cost-Effective Resource Sharing
Support for Common Services
Reliability
Manageability
Performance
Network Architecture
Scalable Connectivity (general) - Answer-A network must provide connectivity among a
set of nodes
, Lowest Level - Direct connectivity
Medium Level - Switched network (2 types - Packet & Circuit Switch)
Highest Level - Indirect Connectivity
Addressing (Unicast), multicast, broadcast)
Connectivity among nodes (specific) - Answer-A node connected to 2 or more networks
is a router / gateway
Physical link between 2 nodes --> point to point
Physical link shared by > 2 nodes --> multiple access (like wifi)
Lowest Level - Direct Connectivity (specific) - Answer-Network consisting of two or more
computers directly connected by some physical medium (a link)
Every point has a link (not feasible to connect all hosts directly to each other)
Switched Network (specific) - Answer-When cooperating hosts are organized in a
systematic manner
A group of nodes or a node in the middle of other nodes acting as a medium to allow
forwarding from one end to the other
Cooperating hosts are called switches / hubs (has to be attached to at least 2 links)
Network runs software that forwards data (packets) received from one link out to
another (store and forward)
Connectivity does not equal the ability to communicate; switches have to know what to
do with packets
Medium Level - Circuit Switched (specific) - Answer-Determine path before we
communicate
Circuit is fixed and dedicated once path is established for communication
Once established, source node can send data through the circuit to the host node
(how telephones communicate)
Medium Level - Packet Switched (specific) - Answer-More efficient for computers;
makes better use of the network
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