What is computer networking?
Types of network
Characteristic of networking
Types of connection
Network criteria
Network
Network is a set of devices connected by communication links.
Load can be a computer printer, or or any other device capable of
sending and slash or receiving data generated by other Nodes on
the network.
Load can be a computer printer, or or any other device capable of
sending and slash or receiving data generated by other Nodes on
the network.
Network criteria
A network must be able to meet a certain number of criteria.
The most important of these are are
performance, reliability and security.
The most important of these are are
performance, reliability and security.
Performance
Performance can be measured in many ways,Including transit time
and response time.
and response time.
transit time is the amount of time required for a message to travel
from one device to another.
from one device to another.
response time is the elapsed time between an enquiry and response.
Performance of a network depends on a number of factors including
number of users the type of transmission medium, the capability of
connected hardware, and the efficiency of the software.
number of users the type of transmission medium, the capability of
connected hardware, and the efficiency of the software.
Performance is often evaluated by to networking metrics :
throughput and delay.
throughput and delay.
we often need more throughput and Less delay.
Reliability
In addition to accuracy of delivery, network reliability is measured by the frequency of failure, the time it takes a link to recover from a failure, the network robustness in catastrophe.
Security
Network security issues includes protecting data from unauthorised access, protecting data from damage and development, and implementing policies and procedure for recovery from breaches and at a losses.
Types of connection
A network is two or more devices connected through links.
A link a is a communication pathway that transfer data from one
device to another. For visualising for princess it is simplest to
imagine any link as a line drawn between two points.
For communication to occur, two devices must be connected in some
way to the same link at the same time .
A link a is a communication pathway that transfer data from one
device to another. For visualising for princess it is simplest to
imagine any link as a line drawn between two points.
For communication to occur, two devices must be connected in some
way to the same link at the same time .
There are two possible types of connections:
point to point and multipoint.
point to point and multipoint.
Point to point
A point to point connection provides a dedicated link between two
devices. The entire capacity of the link is is reserved for transmission
between those two devices. Most point to point connection use an
actual length of wire or cable to connect the two ends.
devices. The entire capacity of the link is is reserved for transmission
between those two devices. Most point to point connection use an
actual length of wire or cable to connect the two ends.
When you change television channels by remote control,
you establishing point to point connection between the remote control
and the television control system.
you establishing point to point connection between the remote control
and the television control system.
Multipoint
A multipoint connection is one in which more than two specific
devices share a single link.
devices share a single link.
In a multipoint environment, the capacity of the channel is shared,
either spatially or temporally.
If several devices can use the link simultaneously, it is a spatially
shared connection.
If uses must take turns, it is a time shared connection.
either spatially or temporally.
If several devices can use the link simultaneously, it is a spatially
shared connection.
If uses must take turns, it is a time shared connection.
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