AKS networking (kubenet, Azure CNI) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is kubenet in AKS networking?

Kubenet is a basic network plugin in AKS that uses Kubernetes' own network model. It assigns IP addresses to pods from a private address space and uses network address translation (NAT) to communicate outside the cluster.

beginner

What does Azure CNI provide in AKS networking?

Azure CNI assigns IP addresses to pods directly from the Azure Virtual Network, allowing pods to have full network connectivity and be treated like regular Azure resources with their own IPs.

intermediate

What is a key difference between kubenet and Azure CNI in AKS?

Kubenet uses NAT and private IPs for pods, limiting direct access, while Azure CNI assigns real Azure VNet IPs to pods, enabling direct connectivity and better integration with Azure services.

intermediate

Why might you choose kubenet over Azure CNI in AKS?

You might choose kubenet for simpler setups or when you want to conserve IP addresses in your Azure VNet, as it uses fewer IPs by NATing pod traffic through node IPs.

intermediate

What is a limitation of Azure CNI in AKS related to IP address management?

Azure CNI requires enough free IP addresses in the Azure VNet for all pods, which can limit scalability if the subnet is small or IPs are scarce.

Which AKS networking option assigns IP addresses to pods from the Azure Virtual Network?

A kubenet

B Calico

C Flannel

D Azure CNI

Azure CNI assigns IP addresses directly from the Azure VNet to pods.

What does kubenet use to allow pods to communicate outside the cluster?

A Direct IP routing

B Load balancer

C Network Address Translation (NAT)

D VPN tunneling

Kubenet uses NAT to translate pod IPs to node IPs for external communication.

Which networking option in AKS requires more IP addresses from the Azure VNet?

A Azure CNI

B kubenet

C Both require the same

D Neither requires IP addresses

Azure CNI assigns IPs to each pod from the VNet, needing more IPs.

If you want pods to have direct network access like regular Azure resources, which AKS networking should you choose?

A kubenet

B Azure CNI

C Host networking

D Bridge networking

Azure CNI allows pods to have direct IPs on the Azure VNet.

Which AKS networking option is simpler and conserves IP addresses?

A kubenet

B Azure CNI

C Calico

D Weave

Kubenet is simpler and uses NAT, conserving IP addresses.

Explain the main differences between kubenet and Azure CNI networking options in AKS.

Think about how pods get their IP addresses and how they connect to the network.

Describe a scenario where choosing kubenet over Azure CNI would be beneficial in AKS.

Consider IP address availability and network complexity.