Which switch port will be in a blocking state? (Click the Exhibit(s) button to view the switch port diagram.)

Last Updated on August 7, 2021 by Admin 3

Which switch port will be in a blocking state? (Click the Exhibit(s) button to view the switch port diagram.)

200-301 Part 05 Q13 057
200-301 Part 05 Q13 057
  • SwitchA Fa0/1
  • SwitchA Fa0/2
  • SwitchB Fa0/1
  • SwitchB Fa0/2
Explanation:
SwitchB will be forwarding on F0/1, and blocking on F0/2.

SwitchA will become the STP root bridge due to its lower MAC address. All ports on the root bridge will become designated ports in a forwarding state. SwitchB has redundant connectivity to the root bridge, and must block one of its interfaces to prevent a switching loop. STP will use its operations to determine which of the redundant interfaces on SwitchB to block to prevent a switching loop

Both interfaces are the same speed (FastEthernet), and thus their cost to the root is the same.

Finally, the interface with the lowest number will become the forwarding port. F0/1 has a lower port number than F0/2, so F0/1 becomes a forwarding port, and F0/2 becomes a blocking port.

Note: Unlike STP, Rapid Spanning Tree Protocol (RSTP) uses the term “discarding” for a switch port that is not forwarding frames.

Objective:
LAN Switching Fundamentals
Sub-Objective:
Describe and verify switching concepts

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