firewall

Networking

Software or equipment that allows or blocks traffic against a set of rules. It explains why a port can be open on a host and still unreachable from elsewhere.

Related terms

port

Appears in(44)

The OSI ModelNetworking Foundations
IP Addressing and SubnettingNetworking Foundations
TCP, UDP, and PortsNetworking Foundations
Networking from the CLILinux for Security
IPv6 and the Modern InternetNetworking Deep Dive
Recon Methodology and Attack SurfaceRecon and Scanning
Host DiscoveryRecon and Scanning
Port Scanning Deep DiveRecon and Scanning
Service and Version DetectionRecon and Scanning
The OWASP Top 10Web and HTTP
IDOR and SSRFVulnerabilities and Exploitation
Active Directory FundamentalsActive Directory
Sockets and NetworkingPython for Security
Build a Port ScannerPython for Security
Automating ReconPython for Security
Images and DockerfilesDocker and Containers
Running Vulnerable Apps in DockerDocker and Containers
Cross-Site ScriptingWeb Application Attacks
Command InjectionWeb Application Attacks
Server-Side Request ForgeryWeb Application Attacks
Finding and Running ExploitsThe Metasploit Framework
OSINT FundamentalsOpen Source Intelligence
Building a TimelineDigital Forensics
Containment, Eradication, RecoveryIncident Response
What a SIEM DoesSIEM and Log Analysis
Indicators vs BehaviorsThreat Hunting
Writing the Analysis ReportMalware Analysis
Firewalls and RulesetsNetwork Defense
Network SegmentationNetwork Defense
VPNs and Zero TrustNetwork Defense
Cloud Models and Shared ResponsibilityCloud Security Fundamentals
Identity in the CloudCloud Security Fundamentals
Common Cloud MisconfigurationsCloud Security Fundamentals
Security FrameworksGovernance, Risk, and Compliance
What Threat Intelligence Actually IsCyber Threat Intelligence
The Intelligence LifecycleCyber Threat Intelligence
Putting CTI to WorkCyber Threat Intelligence
Defending Connected DevicesIoT and OT Security
Scanning and Authenticated ScansVulnerability Management
What Zero Trust Really MeansZero Trust Architecture
The Pillars of Zero TrustZero Trust Architecture
MicrosegmentationZero Trust Architecture
DNS AttacksDNS and Network Services Security
DHCP and NTP RisksDNS and Network Services Security