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Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

$ cat ansible.cfg

[defaults]
 inventory=hosts
 retry_files_enabled=False
 gathering=explicit
 host_key_checking=False

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

- name: Configure ACL on IOS-XR
  hosts: all
  serial: 1
  tags: deploy
  tasks:
    - name: Backup Config
      iosxr_config:
        backup:
      when: not ansible_check_mode
    - name: Deploy ACLs
      iosxr_config:
        src: acl_conf.cfg
        match: line
      when: not ansible_check_mode

Any command-line input or output is written as follows:

$ python3 -m venv dev
$ source dev/bin/activate

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."

Warnings or important notes appear like this.

Tips and tricks appear like this.