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a communication protocol is an agreement which specifies a common language two computers use to exchange messages for instance a protocol specifies
q what is cable modemone more way of accessing internet currently being developed is use of cable modems these require that you subscribe to a cable
the most expensive method of accessing internet is to use leased lines which connect directly to the isp this will increase access rate to anywhere
whole idea of isdn is to digitize the telephone network to permit transmission of video audio and text over existing telephone lines the purpose of
q what is internet service providersnobody truly owns the internet however it is maintained by a group of volunteers interested in supporting this
before we can use internet we have to gain access to it this access is achieved in one of numerous ways above all the internet is a collection of
identifying constraints between objects in a system there are few boundaries to work on boundaries or constraints are functional dependencies among
q illustrate about packet switchingpacket switching is used to avoid long delays in transmitting data over the network packet switching is a
describe functions of data flow diagramafter you have roughly designed data flow diagram you could write a description of each function and you could
end systems are connected together by communication links there are various types of communication links which are made of numerous types of physical
q illustrate tcp - ip networking modeltcpip is an acronym for transmission control protocol internet protocol it is a collection of applications
application layer its the topmost layer in osi model which allows the user to access network this layer provides user interface for network
q what is presentation layerpresentation layer when two hosts are communicating with each other they might use different coding standards and
q show the responsibilities of session layersession layer main functions of this layer are to establish synchronize and maintain the interaction
q what are the principles of transport layertransport layer this layer is the first end-to-end layer header of transport layer includes information
q basic working of network layernetwork layer network layer is responsible for routing a packet within the subnet that is from source to destination
porcess of identifying input and output values first recognize what data is going to be used as input to system and what will be output from system
what are the steps include constructing a functional model recognize input and output values build data flow diagrams which shows functional
q what is data link layerdata link layer data link layer is responsible for transmitting a group of bits between adjacent nodes group of bits is
q illustrate basic working of physical layerphysical layer physical layer is concerned with sending raw bits between source and destination nodes
state the data flow diagramming conpectsthe approach to data flow diagramming is as follows create a data flow diagram for each of major outputs of
q open system interconnection networking modelan open system is a model which allows any two different systems to communicate regardless of their
illustrate the benefits of functional modelfunctional model shows how values are computed this model describes decisions or object structure without
q explain about wide area networkwide area network wan usually refers to a network which covers a large geographical area as well as use
q how can we use metropolitan area networka man essentially a bigger versions of a lan is designed to extend over an entire city it may be single