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Difference between Client-Server and Peer-to-Peer Network

Client-Server Network:

· This model is universally used network model.

· Clients and server are differentiated, Specific server and clients are present.

· Centralized server is used to store the data because its management is centralized.

· Server respond the services which is request by Client.

Peer-to-Peer (P2P) Network:

· This model does not differentiate the clients and the servers.

· In this, every node is itself client and server.

· In Peer-to-Peer Network, Every node can do both request and respond for the services.

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Difference between Client-Server and Peer-to-Peer Network:

S.NO	Client-Server Network	Peer-to-Peer Network
1.	In Client-Server Network, Clients and server are differentiated, Specific server and clients are present.	In Peer-to-Peer Network, Clients and server are not differentiated.
2.	Client-Server Network focuses on information sharing.	While Peer-to-Peer Network focuses on connectivity.
3.	In Client-Server Network, Centralized server is used to store the data.	While in Peer-to-Peer Network, Each peer has its own data.
4.	In Client-Server Network, Server respond the services which is request by Client.	While in Peer-to-Peer Network, Every node can do both request and respond for the services.
5.	Client-Server Network are costlier than Peer-to-Peer Network.	While Peer-to-Peer Network are less costlier than Client-Server Network.
6.	Client-Server Network are more stable than Peer-to-Peer Network.	While Peer-to-Peer Network are less stable if number of peer is increase.
7.	Client-Server Network is used for both small and large networks.	While Peer-to-Peer Network is generally suited for small networks with fewer than 10 computers.

Role of P2P in Blockchain

· P2P is a technology that is based on a very simple principle, and that is the concept of decentralization.

· The peer-to-peer architecture of blockchain allows all cryptocurrencies to be transferred worldwide, without the need of any middle-man or intermediaries or central server.

· With the distributed peer-to-peer network, anyone who wishes to participate in the process of verifying and validating blocks can set up a Bitcoin node.

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P2P: Pros & Cons

Pros..

As blockchain is a decentralized system of peer to peer network, it is highly available due to decentralization.
Because of P2P networking capability, even if one peer gets down, the other peers are still present. Thus nobody can take down the blockchain.
P2P networks offer greater security compared to traditional client-server systems.
When you are using cloud computing to store your data, you need to trust AWS and Google drives, but with the blockchain, because it utilizes peer to peer network you don’t need to trust any third parties which can modify your crucial data. These are non-resistant to censorship by central authorities.
These networks are virtually immune to the Denial-of-Service (DoS) attacks.
The distributed peer-to-peer network, when paired with a majority consensus requirement, gives blockchains a relatively high degree of resistance to malicious activity.

Cons..

· P2P network in blockchain, however, raises few concerns.

· As in blockchain, instead of a central server, distributed ledgers must be updated on every single node, adding transactions requires a considerable amount of computational power.

· Although this provides an increased level of security, it significantly reduces efficiency, and this acts as one of the main difficulties in terms of scalability and mass adoption.