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content/concepts/consensus-network/parallel-networks.md
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@@ -16,17 +16,19 @@ To help members of the XRP Ledger community interact with XRP Ledger technology
| Mainnet | Stable releases | _The_ [XRP Ledger](xrp-ledger-overview.html), a decentralized cryptographic ledger powered by a network of peer-to-peer servers and the home of [XRP](xrp.html). |
| Testnet | Stable releases | An "alternate universe" network that acts as a testing ground for software built on the XRP Ledger, without impacting production XRP Ledger users and without risking real money. The [amendment status](known-amendments.html) of the Testnet is intended to closely mirror the Mainnet, although slight variations in timing may occur due to the unpredictable nature of decentralized systems. |
| Devnet | Beta releases | A preview of coming attractions, where unstable changes to the core XRP Ledger software may be tested out. Developers can use this altnet to interact with and learn about planned new XRP Ledger features and amendments that are not yet enabled on the Mainnet. |
| NFT-Devnet | [XLS-20 pre-release](https://github.com/ripple/rippled/tree/xls20) | A preview of the [XLS-20d](https://github.com/XRPLF/XRPL-Standards/discussions/46) standard for non-fungible tokens on the XRP Ledger. |
| [Hooks Testnet](https://hooks-testnet.xrpl-labs.com/) | [Hooks server](https://github.com/XRPL-Labs/xrpld-hooks) | A preview of on-chain smart contract functionality using [hooks](https://write.as/xumm/xrpl-labs-is-working-on-the-transaction-hooks-amendment-for-the-xrp-ledger). |
Testnet and Devnet each have their own separate supply of test XRP, which Ripple [gives away for free](xrp-testnet-faucet.html) to parties interested in experimenting with the XRP Ledger and developing applications and integrations. Test XRP does not have real-world value and is lost when the network is reset.
Each test network has its own separate supply of test XRP, which is [given away for free](xrp-testnet-faucet.html) to parties interested in experimenting with the XRP Ledger and developing applications and integrations. Test XRP does not have real-world value and is lost when the network is reset.
**Caution:** Ripple makes no guarantees about the stability of altnets. These networks have been and continue to be used to test various properties of server configuration, network topology, and network performance.
**Caution:** Unlike the XRP Ledger Mainnet, test networks are usually _centralized_ and there are no guarantees about the stability and availability of these networks. They have been and continue to be used to test various properties of server configuration, network topology, and network performance.
## Parallel Networks and Consensus
There is no `rippled` setting that defines which network it uses. Instead, it uses the consensus of validators it trusts to know which ledger to accept as the truth. When different consensus groups of `rippled` instances only trust other members of the same group, each group continues as a parallel network. Even if malicious or misbehaving computers connect to both networks, the consensus process overrides the confusion as long as the members of each network are not configured to trust members of another network in excess of their quorum settings.
The main factor in determining which network a server follows is its configured UNL—the list of validators it trusts not to collude. Each server uses its configured UNL to know which ledger to accept as the truth. When different consensus groups of `rippled` instances only trust other members of the same group, each group continues as a parallel network. Even if malicious or misbehaving computers connect to both networks, the consensus process overrides the confusion as long as the members of each network are not configured to trust members of another network in excess of their quorum settings.
Ripple runs the main servers in the Testnet and Devnet; you can also [connect your own `rippled` server to the Testnet](connect-your-rippled-to-the-xrp-test-net.html). The Testnet and Devnet do not use diverse, censorship-resistant sets of validators. This makes it possible for Ripple to reset the Testnet or Devnet on a regular basis.
Ripple runs the main servers in the Testnet, Devnet, and NFT-Devnet; you can also [connect your own `rippled` server to these networks](connect-your-rippled-to-the-xrp-test-net.html). The Testnet and Devnet do not use diverse, censorship-resistant sets of validators. This makes it possible for Ripple to reset the Testnet or Devnet on a regular basis.
## See Also