Cisco CCNA (200-301) — All Questions
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In a controller-based (SDN) network architecture, which plane does the centralized controller primarily assume from the individual network devices?
- a.Data (forwarding) plane
- b.Control plane✓
- c.Management plane only
- d.Physical layer
SDN separates the control plane from the data plane, centralizing control-plane decisions such as routing and topology in a controller. The controller programs the devices, which continue to forward traffic in their data plane. A southbound interface (for example, OpenFlow or NETCONF) carries instructions from the controller down to the devices.
A configuration management tool applies a desired state to network devices without requiring an agent installed on each device, connecting over SSH and using YAML playbooks. Which tool is described?
- a.Ansible✓
- b.Puppet
- c.Chef
- d.SNMP
Ansible is agentless, pushing configuration over SSH and defining desired state in human-readable YAML playbooks, which makes it popular for network automation. Puppet and Chef traditionally use an agent-based, pull model with their own domain-specific languages. All three enforce consistent, repeatable configuration across many devices.