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Traditionally, the participation in DIDO Node Networks to perform tasks is permissionless requiring no outside authority from anyone or anything. Having permissionless access to a Node Network is one of the original guiding principles that is integral to the decentralized nature of DIDOs¹⁾.

Note:

Unfortunately, there are drawbacks to this approach; solutions involving a level of centralization for granting permission can provide benefits like increased speed because there is no need for the costly, time consuming consensus algorithms such as delegated_proof_of_stake_dpos, delegated_byzantine, proof_of_authority_poa and others. However, the use centralized permissioned system is vulnerable to malicious attacks such as Denial of Service and undermines many of the “democratizing” aspects of the DIDO. . <todo @char>Review - Not sure I interpreted and fixed this correctly. The way it was written made no sense. Are we saying that solutions based on consensus are inherently slower than those which centralize the permission granting process? I would think that reaching consensus is inherently a slow complicated process because who in the end declares that consensus has been reached? are the algorithms listed here used in place of a centralized authority? </todo>Consensus algorithms include

Networks making use of proof_of_authority_poa Networks define a fixed number of Authority Nodes. The number of Nodes and associated PoA designation is voted on by the PoA community or defined by the development team. Authority Nodes are similar to Full Nodes and can create and validate blocks. All other Nodes in the Node Network run as Lightweight Nodes, depending on broadcasted data to participate in the blockchain.²⁾

Iota refers to Authority Nodes as Permanodes (definition) because they keep all transaction data even after snapshots are made (concept introduced by Iota ³⁾)