Network Firewall
N/A
网络防火墙
Network Firewall · N/A · 网络防火墙 · NET-wurk FYRE-wawl · perimeter firewall · packet filter firewall · Networking · security · perimeter · basicsNetworkingperimeter firewall packet filter firewall/NET-wurk FYRE-wawl/
Also known as: perimeter firewall, packet filter firewall
Last updated August 9, 2026
Definition
A network firewall allows or blocks traffic between networks based on rules — a core control on routers and cloud security groups.
Real-World Example
Blocking inbound port 22 from the public internet except for admin IPs hardens a server against random SSH scans.
References
Related terms
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