While designing a switched topology, in which two options is UplinkFast recommended? (Choose two )

Question

Options

• Awhen switches of different spanning-tree types are connected (for example. 802.1d connecting to
• Bon distribution layer switches
• Cwhen hello timers are changed to more aggressive values
• Don access layer switches
• Eon the core switches

• A
  89% (41)
• B
  2% (1)
• C
  2% (1)
• E
  7% (3)

Explanation

UplinkFast is a Cisco STP enhancement that enables near-instant failover (under 1 second) when an uplink fails, by immediately promoting a blocked port to forwarding state. It is designed for access layer switches (D) that have exactly two uplinks - one active, one blocked - to distribution layer switches. If the active uplink fails, UplinkFast skips the listening/learning states and brings up the backup port immediately. It is also recommended when switches of different STP types are interconnected (A), since mixed environments can cause delayed convergence that UplinkFast helps mitigate. UplinkFast should NOT be used on distribution (B) or core layer switches (E) because those switches are transit nodes that other switches depend on for path calculation, and enabling UplinkFast there can cause suboptimal topology changes. Changing hello timers (C) is an independent tuning approach unrelated to UplinkFast deployment guidelines.

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