200-301: Cisco Certified Network Associate

Optical-fiber cabling supports higher bandwidth and data-rate options than copper cabling, and it can transmit signals over much longer distances because it uses light rather than electrical signaling. Copper cabling is limited by greater attenuation and electromagnetic interference and is also the medium used for PoE, whereas fiber is not.

Cisco DNA Center improves on traditional campus management by centrally discovering and onboarding existing network devices in brownfield environments, which reduces manual per-device setup and makes adoption of controller-based management much easier. Network assurance, extensibility, and cluster high availability are important features, but straightforward autodiscovery of existing campus elements is the clearest direct advantage in this comparison.

The root bridge in Spanning Tree Protocol is elected using the lowest Bridge ID. Bridge ID comparison uses the lowest bridge priority first, and if there is a tie, the lowest MAC address wins. The lowest listed priority is 8192, shared by SW4 and SW2. Between those two, SW2 has the lower MAC address (00:ac:f0:9b:dc:72), so it has the lowest Bridge ID and is elected the root bridge.

In Cisco OSPF, the network command enables OSPF on interfaces whose IP addresses fall within the address range defined by the network address and wildcard mask. The wildcard 0.0.0.63 matches a /26 block, so network 192.168.12.64 0.0.0.63 area 0 covers addresses from 192.168.12.64 to 192.168.12.127. The interfaces in that range are 192.168.12.65, 192.168.12.121, and 192.168.12.125, which correspond to FastEthernet0/1, Serial0/0, and Serial0/1.102.

The HTTP PUT method is used to create or replace the representation of a resource at the target URI. Standards documentation describes PUT as replacing the state of the target resource, and it is idempotent, which rules out the choices describing it as nonidempotent, read-only, or used to display a website.