Introduction to Computer Networks
Neso Academy
This course is mainly for the undergraduate students and this course is useful for the students
who are preparing for their gate exams. This course can be a prerequisite course to CCNE
international certification course. Each layer is addressed separately as a separate chapters and it
is dealt in a very detailed manner. Security is very important not only in real life even for
computer networks too and the last phase of the computer network will cover the need for
security and how security is provided in computer networks. A computer network is a set of
nodes connected by communication links. A computer is a node because a computer can send
data as well as receive data. A node can be a computer printer or any other device capable of
sending or receiving data. Many devices like switches bridges and routers are also called as
nodes. A computer network is mainly used for research and resource sharing say there are lots of
nodes involved in this internet cloud. Internet contains lots of intermediary devices these are all
intermediary devices and these role end devices why we call this as in device because this will be
either the starting point of the communication or the end point in the communication say for
example if this computer wants to access www. eso. org.
It is a set of nodes connected by communication links where that link can be a wired link or a
wireless link. The devices which are the source or the destination in the communication are
called as n devices the devices which forwards the data from one side to another side are called n
devices
There are 4 basic characteristics any computer network should possess fault tolerance scalability
scalability quality of service and security. We shall see each of these in a detailed manner firstly
fault tolerance fault tolerance is the ability of the computer network to continue working despite
failures and it should ensure there is no loss of service. Scalability is a basic characteristic of the
network and the ability to grow based on the needs and have good performance even after
growth. Network the best example for a scalable network is the internet even this moment many
new devices are connecting to internet and communicating to each other 's internet handles this
perfectly and always gives hope for the newcomers this is what we exactly called as scalability in
this example assume 100 computers are connected to router 3 and we expect our computer
network to work as like the same even after adding these hundred devices. Security is the ability
to prevent unauthorized access misuse or forgery and not only prevention Network should also
provide confidentiality integrity and availability. Quality of service is the main aspect of this
quality of services that it handles law also it handles the delay now we shall see the final
characteristics of computer network that is the security.
Network Protocols & Communications (Part 1)
Neso Academy
Data communication is the exchange of data between two nodes. Data flow means the data is
going to flow from one node to another node. There are three different data flows simplex half-
Neso Academy
This course is mainly for the undergraduate students and this course is useful for the students
who are preparing for their gate exams. This course can be a prerequisite course to CCNE
international certification course. Each layer is addressed separately as a separate chapters and it
is dealt in a very detailed manner. Security is very important not only in real life even for
computer networks too and the last phase of the computer network will cover the need for
security and how security is provided in computer networks. A computer network is a set of
nodes connected by communication links. A computer is a node because a computer can send
data as well as receive data. A node can be a computer printer or any other device capable of
sending or receiving data. Many devices like switches bridges and routers are also called as
nodes. A computer network is mainly used for research and resource sharing say there are lots of
nodes involved in this internet cloud. Internet contains lots of intermediary devices these are all
intermediary devices and these role end devices why we call this as in device because this will be
either the starting point of the communication or the end point in the communication say for
example if this computer wants to access www. eso. org.
It is a set of nodes connected by communication links where that link can be a wired link or a
wireless link. The devices which are the source or the destination in the communication are
called as n devices the devices which forwards the data from one side to another side are called n
devices
There are 4 basic characteristics any computer network should possess fault tolerance scalability
scalability quality of service and security. We shall see each of these in a detailed manner firstly
fault tolerance fault tolerance is the ability of the computer network to continue working despite
failures and it should ensure there is no loss of service. Scalability is a basic characteristic of the
network and the ability to grow based on the needs and have good performance even after
growth. Network the best example for a scalable network is the internet even this moment many
new devices are connecting to internet and communicating to each other 's internet handles this
perfectly and always gives hope for the newcomers this is what we exactly called as scalability in
this example assume 100 computers are connected to router 3 and we expect our computer
network to work as like the same even after adding these hundred devices. Security is the ability
to prevent unauthorized access misuse or forgery and not only prevention Network should also
provide confidentiality integrity and availability. Quality of service is the main aspect of this
quality of services that it handles law also it handles the delay now we shall see the final
characteristics of computer network that is the security.
Network Protocols & Communications (Part 1)
Neso Academy
Data communication is the exchange of data between two nodes. Data flow means the data is
going to flow from one node to another node. There are three different data flows simplex half-
