6.) Differentiate client-server system and peer to peer system?

-Client/server describes the relationship between two computer programs in which one program, the client, makes a service request from another system, the server, which fulfils the request. In a network, the client/server model provides a convenient way to efficiently interconnect programs that are distributed across different locations
Another structure for distributes system is the peer - to peer (P2P) system model. In this model, clients and servers are not distinguished from one another; instead, all nodes within the system may act as either client or a server, depending on whether it is requesting or providing a service.
In client server system, the server is a bottle neck; but in a peer-to peer system, services can be provided by several nodes throughout the network.