Several of those answers are right, but not the 'most-right', A is not correct though. Automation doesn't reduce your hardware footprint at all, if anything it does quite the opposite.
https://www.cisco.com/c/en/us/solutions/collateral/executive-perspectives/network-automation-strategy-wp.html#BenefitsofNetworkAutomation
Security is a higher level of automation and falls under "security automation" and a ssuch is not one of the primary benefits of network automation. Faster, cheaper and more reliable deployment are your first candidates.
This changes the operating paradigm in many cases, with the controller determining many device-specific details:
■ The network engineer does not need to think about every command on every device.
■ The controller configures the devices with consistent and streamlined settings.
■ The result: faster and more consistent changes with fewer issues.
Some of the advantages include the following:
■ Uses new and improved operational models that allow the configuration of the network
rather than per-device configuration
■ Enables automation through northbound APIs that provide robust methods and modeldriven
data
■ Configures the network devices through southbound APIs, resulting in more consistent
device configuration, fewer errors, and less time spent troubleshooting the network
■ Enables a DevOps approach to networks
Going with C and E, a common security issue is misconfiguration, if you are using network automation, the chances of misconfiguration drops, thus increasing security by avoid security misconfigurations.
Ans. is B: op. cost is reduced due to automation of configuration, IOS update and group deployment of policies
Ans.2 is C: You can auto configure new device(s) based on their type/function which is more reliable than human configuration which is prone to errors.
D. is incorrect, the network devices and interconnections remain prone to failures. Automation ensure error free configuration/policy deployment/...etc and not that devices have less failures.
E. Security in traditional networks or controller networks is dependent on security configuration (either configured per device or automated).
Multiple processes is carried out from simple automation, delivering results in a timely and cost effective manner. Operational cost is therefore reduced.
Multiple processes are carried out from simple automation, delivering results in a timely and cost effective manner. Operational cost is therefore reduced.
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