please take not that uplink and backbone fast is used in case of interface failure and the quickly kick in RSTP. Portfast being the correct answer allows you to jump listening and learning states which take about 30mins combined to process and place the port in forwarding state immediately which is a stable state.
UplinkFast is specifically designed to provide rapid connectivity restoration when a link goes down and then comes back up. It focuses on the rapid restoration of uplink ports. On the other hand, PortFast is generally used for access ports to speed up the STP process by bypassing the listening and learning phases.
What y'all smoking with C?
"UplinkFast is a Cisco specific feature that improves the convergence time of the Spanning-Tree Protocol (STP) in the event of the failure of an uplink. "
where does this states plugging in?
Answer is A
UplinkFast optimizes convergence when an uplink fails on an access layer switch. For good STP design, access layer switches should not become root or become transit switches. (A transit switch is a switch that forwards frames between other switches.) Figure 3-7 shows the actions taken when UplinkFast is enabled on a switch, and then when the Root Port fails.
https://www.ccexpert.us/routing-switching/portfast-uplinkfast-and-backbonefast.html
enable spanning-tree uplinkfast. This is a global command, you can’t configure it on the interface level.
When uplinkfast is enabled a non-designated port will go to forwarding state immediately if the root port fails. Instead of 30 seconds downtime connectivity is restored immediately.
So uplink is for when a root port fails,
The answer is D. Look carefully at the wordings: establishes a network connection immediately when "IT" is plugged in. It refers to a switch. Portfast is used for end devices not switch. The answer is C.
Uplinkfast is mainly used in a distribution or core layer.
https://www.cisco.com/c/es_mx/support/docs/lan-switching/spanning-tree-protocol/10575-51.html
Answer A
When you enable PortFast on a switch or trunk port, the port is immediately transitioned to the spanning tree forwarding state.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html
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