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javascript supports the normal control structures the conditionals if ifelse amp switch the iterations for while dowhile break amp
logical operatorsoperatorfunctionalityexample explanation ampamplooks at 2 expressions amp returns a value of true if the expressions on the
operatorfunctionalityexampleexplanationsets one value equal to anothercounter0 sets the counter to equivalent the number 0shortcut for adding
a value the data assigned to a variable may contain any sort of data though javascript considers data to fall into many possible types based on the
while you declare a variable in a function the variable can be accessed within that function only while you exit the function the variable is
you can declare a variable by the var statement such asvar strname some valueyou can also declare a variable with simply assigning a value to the
as specified earlier nobody truly owns the internet although it is maintained through a group of volunteers interested in supporting this mode of
one of the commonest ways of connection to internet is by dial up connection via a modem amp a telephone line using these you can link to a host
before we can employ the internet we need to gain access to it this access is attained in one of many ways which will be discussed in this
end systems are linked together through communication links there are several types of communication links that are made of distinct types of
this is an acronym for transmission control protocol internet protocol this is a collection of applications protocols and services tcpip protocol
application layer in the osi model its the topmost layer which enables the user to access the network for network applications this layer provides
presentation layer while two hosts are communicating with each other they might employ distinct coding standards amp character sets for internally
session layer the major functions of this layer are to establish maintain amp synchronize the interaction among two communication hosts it ensures
transport layer is the first end-to-end layer header of the transport layer has information which helps send the message to the corresponding layer
this layer is responsible for routing a packet in the subnet ie from source to destination nodes across multiple nodes in the similar network or
it is responsible for transmitting a group of bits among the adjacent nodes the group of bits is termed as frame the network layer passes a data unit
physical layer this is concerned with sending raw bits among the source amp destination nodes over a physical medium the source amp destination nodes
an open system is a model which allows any two distinct systems to communicate regardless of their underlying architecture the reason of the osi
there are two kinds of networking models obtainable osi reference model amp the tcpip network model for the design of computer network system we
usually the term wide area network wan refers to a network that covers a large geographical area and employs communications subnets circuits to link
a man basically bigger versions of a lan is designed to extend over a whole city it can be single network like a cable television network or it
it is a privately - owned computer networks confined to small geographical area like an office or a factory extensively used to connect office pcs to
there are distinct approaches to the classification of computer networks one such classification is depends on the distance approach in this section
the internet is worldwide computer network which interconnects millions of computing devices all through the world mostly devices are pcs and servers