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bongoDev | Network Exposure on Nodes: Listeners & Firewall Controls - CKS Exam Preparation Pro

TopicCKS Exam Preparation Pro

01CKS Exam Orientation: Current Format, CKA Prerequisite & BlueprintPreview
02CKS Allowed Resources, Exam UI & Documentation Navigation
03Security Mental Model: Build, Deploy & Runtime Attack Surfaces
04The 4Cs: Cloud, Cluster, Container & Code
05CKS Lab Strategy: kubeadm VMs, Disposable Clusters & Security Tools
06Performance Exam Workflow: Read → Inspect → Change → Verify
07Security Evidence Before Remediation
0830-Day CKS Study Plan & Free Practical Diagnostic
09Domain 1 Overview: Cluster Setup — 15%
10NetworkPolicy Fundamentals: Default Deny First
11NetworkPolicy Allow Rules: Labels, Ports & Direction
12Egress Control: DNS, External CIDRs & Metadata Endpoints
13CIS Benchmark Workflow with kube-bench
14kube-apiserver Security Configuration
15kubelet Security Configuration
16etcd Security: TLS, Exposure & File Permissions
17Ingress TLS Configuration & Verification
18Protecting Node Metadata & Sensitive Endpoints
19Verify Platform Binaries & Supply Integrity at Install Time
20Domain 2 Overview: Cluster Hardening — 15%
21RBAC Least Privilege: Roles, ClusterRoles & Bindings
22RBAC Privilege Escalation & Wildcard Auditing
23ServiceAccount Hardening & Token Automount
24Short-Lived ServiceAccount Tokens & TokenRequest
25Restricting Kubernetes API Access
26Admission Control & NodeRestriction
27Kubeconfig, Client Certificates & Admin Credential Hygiene
28Security-Driven Kubernetes Upgrade Workflow
29Domain 3 Overview: System Hardening — 10%
30Minimize Host OS Footprint & Disable Unneeded Services
31Host Users, Groups, sudo & Least Privilege
32Network Exposure on Nodes: Listeners & Firewall Controls
33Sensitive File Permissions & Runtime Socket Protection
34AppArmor Fundamentals, Profiles & Pod Attachment
35seccomp RuntimeDefault: Reduce Syscall Attack Surface
36seccomp Localhost Profiles
37Kernel Hardening Evidence: sysctl, Modules & Host Controls
38Domain 4 Overview: Minimize Microservice Vulnerabilities — 20%
39Pod Security Standards & Pod Security Admission
40Run as Non-Root & Explicit User/Group IDs
41Disable Privilege Escalation & Drop Linux Capabilities
42Read-Only Root Filesystem & Writable Scratch Volumes
43Dangerous Pod Features: privileged, hostPID, hostNetwork & hostPath
44Kubernetes Secrets: Exposure, Mounts & Safe Use
45ServiceAccount Token Exposure Inside Pods
46Multi-Tenancy Isolation: Namespace, RBAC, Network & Policy
47RuntimeClass & Sandboxed Containers
48Pod-to-Pod Encryption with Cilium WireGuard
49Resource Limits as a Security Boundary Against DoS
50Domain 5 Overview: Supply Chain Security — 20%
51Minimal Base Images & Multi-Stage Container Builds
52Secure Dockerfile Review
53SBOM Fundamentals & Kubernetes BOM Tool
54Container Image Vulnerability Scanning
55KubeLinter Static Workload Analysis
56Kubesec Security Scoring & Manifest Review
57Permitted Registries & Image Source Policy
58Immutable Image References & Digest Pinning
59Artifact Signing & Verification Concepts with cosign
60CI/CD Supply-Chain Controls & Incident Response
61Domain 6 Overview: Monitoring, Logging & Runtime Security — 20%
62Kubernetes Audit Policy Fundamentals
63Enable kube-apiserver Audit Logging
64Audit Log Investigation: Who Did What?
65Falco Fundamentals: Rules, Fields & Runtime Events
66Writing a Custom Falco Rule
67Behavioral Analytics & Attack-Phase Reasoning
68Runtime Immutability & Detecting Unauthorized Writes
69Node/Container Runtime Investigation with crictl & journalctl
70Compromised ServiceAccount & RBAC Containment
71Runtime Network Investigation & Egress Containment
72CKS Timed Strategy: 15–20 Tasks in 120 Minutes
73CKS Final Command, Security Evidence & Exam-Day Cheatsheet

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Knowledge Hub/CKS Exam Preparation Pro/Network Exposure on Nodes: Listeners & Firewall Controls

CKS Exam Preparation Pro

Paid lesson · Advanced · 24 min read

Network Exposure on Nodes: Listeners & Firewall Controls

Identify listening services and restrict task-specified external access while preserving required control-plane/node communication. Blueprint: Domain 3 — System Hardening (10%).

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