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Layer 2 defined as OSI’s second networking layer and as the roll‑up tech behind Ethereum’s Base network. Learn the core function, examples like Ethernet and
The data link layer—commonly called layer 2—is the second tier of the OSI model that moves frames between devices on the same network segment, while Ethereum’s Base uses layer 2 rollups to shift transaction execution off‑chain and cut fees [1][2].
| At a glance | |
|---|---|
| OSI position | Layer 2 (data link) |
| Core function | Transfers frames locally and arbitrates media access |
| Typical protocols | Ethernet, Wi‑Fi (IEEE 802.11), ATM |
| Crypto example | Base (Coinbase’s Optimistic rollup) reduces Ethereum fees |
In the seven‑layer OSI stack, layer 2 sits directly above the physical layer and provides the “functional and procedural means to transfer data between network entities” [1]. It handles local delivery of frames, assigns flat MAC addresses, and resolves collisions through media‑access control (MAC) sub‑layers such as CSMA/CD for Ethernet or CSMA/CA for Wi‑Fi [1]. Because it does not perform global routing, layer 2 traffic stays within a single LAN, analogous to a neighborhood traffic cop directing cars without concern for their ultimate destination [1].
Base, launched by Coinbase, illustrates how the term is repurposed for blockchain scaling. Base is an “Ethereum Layer 2 network” that employs optimistic rollups—transactions are processed off‑chain and later settled on Ethereum’s mainnet [2]. By assuming transactions are valid unless disputed, Base lowers fees and boosts throughput while preserving Ethereum’s security model [2]. The network is built on the OP Stack, an open‑source rollup framework that ensures full EVM compatibility, letting existing smart contracts run with minimal changes [2].
| Metric | Value |
|---|---|
| Rollup type | Optimistic |
| Settlement chain | Ethereum mainnet |
| Compatibility | EVM‑compatible via OP Stack |
Layer 2 remains a pivotal bridge—whether in traditional networking, where it ensures reliable local data transfer, or in blockchain, where it promises cheaper, faster transactions without sacrificing the security of the underlying base layer. The open question is how quickly rollup solutions like Base will become the default entry point for Ethereum users.
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They aim to increase transaction speed and lower fees by processing activity off‑chain while still anchoring security to the Layer 1 blockchain.
Optimistic rollups assume transactions are valid unless challenged, whereas zero‑knowledge rollups use cryptographic proofs to verify transaction batches before they are posted on‑chain.
DeFi protocols, NFT platforms, and crypto payment systems are among the sectors deploying Layer 2 solutions to improve user experience.