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IT Terminology Dictionary: Letter L
| Abbreviation | Decoding | Description | Group | Note | Related terms |
|---|---|---|---|---|---|
| L2TP | Layer 2 Tunneling Protocol | A tunneling protocol at layer 2. | Network & Infrastructure | Used for VPN connections. | |
| LACP | Link Aggregation Control Protocol | A protocol for combining multiple network interfaces into one channel. | Network & Infrastructure | To increase bandwidth and ensure failover. | |
| LAN | Local Area Network | A network that connects devices within one building. | Network & Infrastructure | Home Wi-Fi is a LAN. | |
| LDAP | Lightweight Directory Access Protocol | A protocol for accessing user directories. | Security | Stores accounts, groups, permissions. | |
| LFI | Local File Inclusion | A vulnerability that allows including a local file on the server. | Security | If you did this by accident — run to change your passwords. | |
| LIFO | Last In, First Out | A stack where the last in is the first out. | Development | Like a stack of plates: you take the one placed last. | |
| LLDP | Link Layer Discovery Protocol | A protocol for discovering neighboring devices on the network. | Network & Infrastructure | Like the joke `who's here?` for routers and switches. | |
| LTV | Lifetime Value | Total profit a company gets from one customer over the entire period of their relationship. | Marketing | LTV is how much money a client will leave with you before they go to a competitor for better coffee. If LTV is high — you can afford to buy this client free coffee. If it's low — better not spend money, they'll leave anyway. In short, it's like relationships: the longer you're with a person, the more they've invested in you, and the harder it is to part. | |
| LVS | Linux Virtual Server | A load balancer for Linux. | Network & Infrastructure | Distributes traffic between servers. High-performance and stable. |
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