diff --git a/docs/09-Networking/20-CoreDNS-in-Kubernetes.md b/docs/09-Networking/20-CoreDNS-in-Kubernetes.md
index 4f720480..9b76d3c9 100644
--- a/docs/09-Networking/20-CoreDNS-in-Kubernetes.md
+++ b/docs/09-Networking/20-CoreDNS-in-Kubernetes.md
@@ -1,152 +1,141 @@
-# CoreDNS in kubernetes
+# CoreDNS in Kubernetes
- Take me to [Lecture](https://kodekloud.com/courses/certified-kubernetes-administrator-with-practice-tests/lectures/9808285)
+ - Take me to [Lecture](https://kodekloud.com/courses/certified-kubernetes-administrator-with-practice-tests/lectures/9808285)
- #### Solution
+In this section, we will take a look at **CoreDNS in the Kubernetes**
- 1. Check the Solution
-
+## To view the Pod
- ```
- CoreDNS
- ```
-
-
- 2. Check the Solution
+```
+$ kubectl get pods -n kube-system
+NAME READY STATUS RESTARTS AGE
+coredns-66bff467f8-2vghh 1/1 Running 0 53m
+coredns-66bff467f8-t5nzm 1/1 Running 0 53m
+```
-
+## To view the Deployment
- ```
- 2
- ```
-
+```
+$ kubectl get deployment -n kube-system
+NAME READY UP-TO-DATE AVAILABLE AGE
+coredns 2/2 2 2 53m
+```
- 3. Check the Solution
+## To view the configmap of CoreDNS
-
+```
+$ kubectl get configmap -n kube-system
+NAME DATA AGE
+coredns 1 52m
+```
- ```
- 10.96.0.10
- ```
-
+## CoreDNS Configuration File
- 4. Check the Solution
+```
+$ kubectl describe cm coredns -n kube-system
-
+Corefile:
+---
+.:53 {
+ errors
+ health { lameduck 5s
+ }
+ ready
+ kubernetes cluster.local in-addr.arpa ip6.arpa {
+ pods insecure
+ fallthrough in-addr.arpa ip6.arpa
+ ttl 30
+ }
+ prometheus :9153
+ forward . /etc/resolv.conf
+ cache 30
+ loop
+ reload
+}
+```
- ```
- /etc/coredns/Corefile
+## To view the Service
- OR
+```
+$ kubectl get service -n kube-system
+NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
+kube-dns ClusterIP 10.96.0.10 53/UDP,53/TCP,9153/TCP 62m
+```
- kubectl -n kube-system describe deployments.apps coredns | grep -A2 Args | grep Corefile
- ```
-
+## To view Configuration into the kubelet
- 5. Check the Solution
+```
+$ cat /var/lib/kubelet/config.yaml | grep -A2 clusterDNS
+clusterDNS:
+- 10.96.0.10
+clusterDomain: cluster.local
-
+```
- ```
- Configured as a ConfigMapObject
- ```
-
+## To view the fully qualified domain name
- 6. Check the Solution
+- With the `host` command, we will get fully qualified domain name (FQDN).
-
+```
+$ host web-service
+web-service.default.svc.cluster.local has address 10.106.112.101
- ```
- CoreDNS
- ```
-
+$ host web-service.default
+web-service.default.svc.cluster.local has address 10.106.112.101
- 7. Check the Solution
+$ host web-service.default.svc
+web-service.default.svc.cluster.local has address 10.106.112.101
-
+$ host web-service.default.svc.cluster.local
+web-service.default.svc.cluster.local has address 10.106.112.101
+```
- ```
- coredns
- ```
-
+## To view the `/etc/resolv.conf` file
- 8. Check the Solution
+```
+$ kubectl run -it --rm --restart=Never test-pod --image=busybox -- cat /etc/resolv.conf
+nameserver 10.96.0.10
+search default.svc.cluster.local svc.cluster.local cluster.local
+options ndots:5
+pod "test-pod" deleted
+```
-
+## Resolve the Pod
- ```
- cluster.local
- ```
-
+```
+$ kubectl get pods -o wide
+NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
+test-pod 1/1 Running 0 11m 10.244.1.3 node01
+nginx 1/1 Running 0 10m 10.244.1.4 node01
- 9. Check the Solution
+$ kubectl exec -it test-pod -- nslookup 10-244-1-4.default.pod.cluster.local
+Server: 10.96.0.10
+Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
-
+Name: 10-244-1-4.default.pod.cluster.local
+Address 1: 10.244.1.4
+```
- ```
- Ok
- ```
-
+## Resolve the Service
- 10. Check the Solution
+```
+$ kubectl get service
+NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
+kubernetes ClusterIP 10.96.0.1 443/TCP 85m
+web-service ClusterIP 10.106.112.101 80/TCP 9m
-
+$ kubectl exec -it test-pod -- nslookup web-service.default.svc.cluster.local
+Server: 10.96.0.10
+Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
- ```
- web-service
- ```
-
+Name: web-service.default.svc.cluster.local
+Address 1: 10.106.112.101 web-service.default.svc.cluster.local
- 11. Check the Solution
+```
-
-
- ```
- web-serivce.default.pod
- ```
-
- 12. Check the Solution
+#### References Docs
-
-
- ```
- web-service.payroll
- ```
-
-
- 13. Check the Solution
-
-
-
- ```
- web-service.payroll.svc.cluster
- ```
-
-
- 14. Check the Solution
-
-
-
- ```
- kubectl edit deploy webapp
-
- Search for DB_Host and Change the DB_Host from mysql to mysql.payroll
-
- spec:
- containers:
- - env:
- - name: DB_Host
- value: mysql.payroll
- ```
-
-
- 15. Check the Solution
-
-
-
- ```
- kubectl exec -it hr nslookup mysql.payroll > /root/nslookup.out
- ```
-
\ No newline at end of file
+- https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#services
+- https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pods