Introduction - Basics (network)

 

What does 'Computer Network' mean?  

Computer Network is a collection of devices (nodes) connected by a communication link. These devices that form a network (nodes) are capable of sending or/and receiving data.

They aid in Data Communication.

What are the criteria that must be considered to judge the effectiveness of a network?

1. Performance
 - quality of service. can me measured by calculating the time it takes between sending a data request and recieving the data (transit time and response time) over a network. Metrics considered here : throughput, delay.

2. Reliability
- the fault tolerance of the network. measured by the frequency of failure, the time it takes a link to recover from a failure, and the network's (recovers) robustness in
a catastrophe (in case of an error or fault)

3. Security
- includes protecting data beings transmitted from unauthorized access, protecting data alterted or deleted, and implementing policies and procedures for recovery from breaches and data losses.

4. Scalability
- refers to the extensibilty factor. Should be able to accomodate more devices without compromising other factors.

What are the types of Network connections?

1. Point-to-point 
- a dedicated link is provided between two devices.
for example : tv remote, connect the two devices only. (tv and remote)

2. Multipoint
- connection is one in which more than two specific devices share a single link.
for example : house device controller, a single remote can be used to control the AC, the Lights system and other smart home regulatories.


What are Network Topologies?

Network topologies defines how the various devices of a network are laid out, physically.
that is: geometric representation of the relationship of all the links and linking devices to one another.

Types:
1. Bus topology
2. Star topology
3. Ring topology
4. Mesh topology
5. Tree toplology
6. Hybrid topology
 
note their respective diagrams, features, advantages and disadvantages.

//for furthur refernence textbook - pg(10)

what are the various network categories?

1. LAN
2. MAN
3. WAN
4. PAN


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Introduction - Basics (Data Communication)

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