[zh] update zh/docs/concepts page, fix 23920

content/zh/docs/concepts/services-networking/_index.md

@@ -1,4 +1,19 @@
 ---
 title: "服务、负载均衡和联网"
-weight: 80
+weight: 60
+description: Kubernetes 网络背后的概念和资源。
 ---
+
+<!--
+Kubernetes networking addresses four concerns:
+- Containers within a Pod use networking to communicate via loopback.
+- Cluster networking provides communication between different Pods.
+- The Service resource lets you expose an application running in Pods to be reachable from outside your cluster.
+- You can also use Services to publish services only for consumption inside your cluster.
+-->
+
+Kubernetes 网络解决四方面的问题：
+- 一个 Pod 中的容器之间通过本地回路（loopback）通信。
+- 集群网络在不同 pod 之间提供通信。
+- Service 资源允许你对外暴露 Pods 中运行的应用程序，以支持来自于集群外部的访问。
+- 可以使用 Services 来发布仅供集群内部使用的服务。