How to do it...

1. To the group_vars/network.yml file, add the following system parameters:

$ cat group_vars/network.yml
<-- Output Trimmed for brevity ------>
name_servers:
 - 172.20.1.250
 - 172.20.1.251
ntp_server: 172.20.1.17

2. Create a new playbook called pb_build_network.yml with the following information:

$ cat pb_build_network.yml
  ---
- name: "PLAY 1: Configure All Lan Switches"
  hosts: lan
  tags: lan
  tasks:
  - name: "Configure Hostname and Domain Name"
    ios_system:
      hostname: "{{ inventory_hostname }}"
      domain_name: "{{ domain_name }}"
      lookup_enabled: no
      name_servers: "{{ name_servers }}"
  - name: "Configure NTP"
    ios_ntp:
      server: "{{ ntp_server }}"
      logging: true
      state: present