Computer Networking
goals with its classification
The most important
goals of computer networks are-
1)
Reliability
Goals
2)
Performance
Goals
3)
Security
Goals
4)
Network
Cast
- 1) Reliability
Goals:- Network reliability can be measured by the networks robustness in a catastrophe, failure frequency and average down time of network. These are described as follows-
a)
Catastrophe
b)
Failure
Frequency
c)
Average
Down Time
- a) Catastrophe:- Network should be protected from catastrophe events like theft or earthquake. One protection of network against these is a reliable system to backup network software.
- b)
Failure
Frequency:- A network which fails rarely is good for a user but a network which fails oftently is of little value to a user.
- c)
Average
Down Time:- How long does it take to restore service is called down time. A network with less value of average down time is more important than one that does not.
2)
Performance
Goals:- The network performance is measured with its transit time and response time. Transit time is the time needed for a message to travel from one device to another device in network. Response time is the amount of time elapsed between an inquiry and a response. Network performance depends on a number of factors, which are given below-
a)
Software
b)
Hardware
c)
Network
Transmission Medium
d)
Traffic
Load
- a)
Software:- Travelling a message from node to node through a network needs processing for transformation of raw data into transmittable signals, to ensure error free delivery to route these signals to the proper destination and to recast the signals into a farm the receiver can use. The software which gives these type of services affects both the speed and the reliability of a network link.
- b)
Hardware:- Both the speed and capacity of transmission are affected by the types of hardware. A higher speed system with greater storage capacity gives better performance.
- c)
Network
Transmission Medium:- A network transmission medium may be wireless (microwave, satellite, etc.) or wired (optical fiber, copper cables, etc.).
- d)
Traffic Load:- The network design is dependent on an assessment of the average number of users that will be communicating at any moment of tim
3)
Security
Goals:- Network security issues comprise of protecting data from unauthorized access and prevention from virus attacks.
a)
Unauthorized
Access
b)
Viruses
- a)
Unauthorized
Access:- Protection of sensitive data from unauthorized access is mandatory for any network to be useful.
- b)
Viruses:- Since a network is accessible from many points, it can be susceptible to computer viruses. A virus is an illicitly introduced code to damage the functionality of a system.
4)
Network Cost
The
network cast is calculated on the following-
a)
Runtime Cost
b)
Fixed Cost
- a)
Runtime Cost:- To control a network functionally strong, very good maintenance is needed and as much complexity we increase in design chances of failure increases accordingly which in turn leads to more down time and maintenance cost of network.
- b)
Fixed Cost:- The cost of transmission medium and devices (such as router, switch, hub, etc.) which are needed to make a network functional plays an important role while designing the network.
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