> For the complete documentation index, see [llms.txt](https://atomoh.gitbook.io/kubernetes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://atomoh.gitbook.io/kubernetes/en/quiz-collection/networking/cilium/networking-concepts-quiz.md).

# Networking Concepts Quiz

> **Supported Version**: Cilium 1.17 **Last Updated**: February 22, 2026

## OSI Model and Basic Concepts

1. **Which layer of the OSI model does Cilium primarily operate at?**
   * A) L2 (Data Link Layer)
   * B) L3/L4 (Network/Transport Layer)
   * C) L7 (Application Layer)
   * D) All layers from L3 to L7
2. **Which of the following is an L2 (Data Link Layer) address?**
   * A) IP address
   * B) MAC address
   * C) Port number
   * D) URL
3. **Which of the following is an L3 (Network Layer) protocol?**
   * A) TCP
   * B) UDP
   * C) IP
   * D) HTTP

## Container Networking

4. **What is Cilium's default network model?**
   * A) Bridge mode
   * B) Overlay network
   * C) Underlay network
   * D) Host network
5. **What is the default overlay protocol used by Cilium?**
   * A) VXLAN
   * B) GRE
   * C) IPsec
   * D) MPLS
6. **What is the main benefit of Cilium's Direct Routing mode?**
   * A) Higher security
   * B) Better compatibility
   * C) Lower latency and higher throughput
   * D) Easier setup

## IP Address Management (IPAM)

7. **What is Cilium's default IPAM mode?**
   * A) Kubernetes Host Scope
   * B) Cluster Scope
   * C) CRD-based
   * D) AWS ENI
8. **What is the recommended IPAM mode when using Cilium on AWS EKS?**
   * A) Kubernetes Host Scope
   * B) Cluster Scope
   * C) AWS ENI
   * D) CRD-based
9. **What Kubernetes feature does Cilium's IPAM 'PodCIDR' mode utilize?**
   * A) NodeSpec.PodCIDR
   * B) NodeSpec.CIDR
   * C) NodeSpec.Subnet
   * D) NodeSpec.IPRange

## Services and Load Balancing

10. **Which feature is NOT provided by Cilium's kube-proxy replacement mode?**
    * A) ClusterIP service support
    * B) NodePort service support
    * C) LoadBalancer service support
    * D) Service mesh functionality
11. **What algorithms does Cilium use for service load balancing?**
    * A) Round robin
    * B) Least connections
    * C) IP hash
    * D) All of the above
12. **What does Cilium's Global Service feature enable?**
    * A) Globally distributed service access
    * B) Service load balancing across multiple clusters
    * C) Global IP address allocation
    * D) Global network policy application

## Network Policies

13. **What does the 'toCIDR' rule in Cilium network policies allow?**
    * A) Traffic to specific IP address ranges
    * B) Traffic to specific domain names
    * C) Traffic to specific services
    * D) Traffic to specific ports
14. **What does the 'world' entity mean in Cilium network policy 'toEntities' rules?**
    * A) All internal cluster endpoints
    * B) All external networks
    * C) All nodes
    * D) All namespaces
15. **Which protocol is NOT supported in Cilium's L7 policies?**
    * A) HTTP
    * B) gRPC
    * C) Kafka
    * D) SMTP

## Advanced Networking Concepts

16. **What protocols can be used in Cilium's Transparent Encryption feature?**
    * A) IPsec
    * B) WireGuard
    * C) Both A and B
    * D) TLS
17. **What technology does Cilium's Multi-cluster feature use?**
    * A) Cluster Federation
    * B) Cluster Mesh
    * C) Multi-cluster Networking
    * D) Global Cluster
18. **What is possible through Cilium's BGP support?**
    * A) Route exchange with external routers
    * B) External IP advertisement for LoadBalancer services
    * C) Direct routing between clusters
    * D) All of the above
19. **What is the main purpose of Cilium's Egress Gateway feature?**
    * A) Preserving the source IP address of external traffic
    * B) Changing the destination IP address of external traffic
    * C) Encrypting external traffic
    * D) Blocking external traffic
20. **Which statement is correct about Cilium's Host Routing feature?**
    * A) Routing between host network and Pod network
    * B) Direct routing between hosts
    * C) Host network interface protection
    * D) Host-based load balancing