The four basic requirements for a reliable network include fault tolerance, scalability, quality of service, and security. These requirements are explained below

Fault Tolerance

The first requirement for a reliable network is that it needs to be fault-tolerant. The fault tolerance of a network means that it requires having the capability to continue data deliverance in case of any hardware failure. For fault-tolerance network, there need to be backups for the network hardware. The users trust more fault-tolerant networks, which has backups instead of the one with a single hardware and no backup.

Scalability

Scalability is an important requirement for reliable networks, as, with the increasing amount of smart devices, every network needs to be scalable, to quickly adopt new devices in the network. There are also various algorithms or structure designs which are used to increase the scalability of a network, such as a tree structure. Scalability is more important in the case of large networks.

QoS

QoS (Quality of Service) is also important for providing a reliable network to users. QoS is responsible for the reliable delivery of communications in the network. It also has the responsibility of avoiding congestions in the network. The QoS of a network can be maintained through different algorithms, that can also be used for traffic congestions.

Security

It is a significant factor for a reliable network. Security of a network consists of the main elements, such as confidentiality, integrity, and availability. These three aspects of security define the security policies for the network, and the network is considered secure if the security policies cover all loopholes in the network.