# Computer Networks

- [DMZ](/hacktrain/it/computer-networks/dmz.md)
- [Firewall](/hacktrain/it/computer-networks/firewall.md)
- [Gateway](/hacktrain/it/computer-networks/gateway.md)
- [Proxy](/hacktrain/it/computer-networks/gateway/proxy.md)
- [Router](/hacktrain/it/computer-networks/gateway/router.md)
- [Hub & Switch](/hacktrain/it/computer-networks/hub-switch.md)
- [Protocols](/hacktrain/it/computer-networks/protocols.md)
- [ISO/OSI Model](/hacktrain/it/computer-networks/protocols/osi.md)
- [Layer 2 - Data Link](/hacktrain/it/computer-networks/protocols/layer2.md)
- [Ethernet](/hacktrain/it/computer-networks/protocols/layer2/ethernet.md)
- [Address Resolution Protocol (ARP)](/hacktrain/it/computer-networks/protocols/layer2/arp.md)
- [Layer 3 - Network](/hacktrain/it/computer-networks/protocols/layer-3-network.md)
- [Internet Protocol](/hacktrain/it/computer-networks/protocols/layer-3-network/ip.md)
- [Internet Control Message protocol](/hacktrain/it/computer-networks/protocols/layer-3-network/icmp.md)
- [Layer 4 - Transport](/hacktrain/it/computer-networks/protocols/layer-4-transport.md)
- [TCP](/hacktrain/it/computer-networks/protocols/layer-4-transport/tcp.md)
- [UDP](/hacktrain/it/computer-networks/protocols/layer-4-transport/udp.md)
- [Layer 7 - Application](/hacktrain/it/computer-networks/protocols/layer-7-application.md)
- [DNS](/hacktrain/it/computer-networks/protocols/layer-7-application/dns.md)
- [HTTP](/hacktrain/it/computer-networks/protocols/layer-7-application/http.md)
- [HTTPS](/hacktrain/it/computer-networks/protocols/layer-7-application/https.md)
- [Servers](/hacktrain/it/computer-networks/servers.md)
- [Apache HTTP Server](/hacktrain/it/computer-networks/servers/apache.md)
- [Flask Server](/hacktrain/it/computer-networks/servers/flask.md)
- [NGINX HTTP Server](/hacktrain/it/computer-networks/servers/nginx.md)
- [Python HTTP Server](/hacktrain/it/computer-networks/servers/python_http.md)
- [VPN](/hacktrain/it/computer-networks/vpn.md)
- [OpenVPN](/hacktrain/it/computer-networks/vpn/openvpn.md)