Worker Node Components: Proxy - kube-proxy

The kube-proxy is the network agent which runs on each node, control plane and workers, responsible for dynamic updates and maintenance of all networking rules on the node. 
It abstracts the details of Pods networking and forwards connection requests to the containers in the Pods. 

The kube-proxy is responsible for TCP, UDP, and SCTP stream forwarding or random forwarding across a set of Pod backends of an application,
and it implements forwarding rules defined by users through Service API objects.


Worker Node Components: Add-ons
Add-ons are cluster features and functionality not yet available in Kubernetes, therefore implemented through 3rd-party pods and services.

DNS
Cluster DNS is a DNS server required to assign DNS records to Kubernetes objects and resources.
Dashboard 
A general purpose web-based user interface for cluster management.
Monitoring 
Collects cluster-level container metrics and saves them to a central data store.
Logging 
Collects cluster-level container logs and saves them to a central log store for analysis.