Which IEEE Standard Protocol is Initiated After DTP Completion in a Switch over FastEthernet?

C

DTP (Dynamic Trunking Protocol) is a Cisco proprietary protocol used to negotiate trunking between switches. It is used to dynamically negotiate whether to send frames tagged with VLAN information or not.

When a switch port is configured for Dynamic Trunking Protocol (DTP), it sends DTP frames to the adjacent switch port to initiate trunk negotiation. If the adjacent switch port also supports DTP, it responds with its own DTP frames to negotiate the trunk link.

Once the DTP negotiation is successful, the switch port is configured as a trunk port, and frames can be sent with VLAN information. At this point, the switch port begins to use the IEEE 802.1Q protocol to tag frames with VLAN information.

Therefore, the IEEE standard protocol initiated as a result of successful DTP completion in a switch over FastEthernet is 802.1Q. Option C (802.1Q) is the correct answer.

Option A (802.3ad) is the IEEE standard for Link Aggregation Control Protocol (LACP), which is used to bundle multiple physical links into a single logical link for increased bandwidth and redundancy.

Option B (802.1w) is the IEEE standard for Rapid Spanning Tree Protocol (RSTP), which is an improvement over the original Spanning Tree Protocol (STP) to provide faster convergence times.

Option D (802.1d) is the IEEE standard for the original Spanning Tree Protocol (STP), which is used to prevent loops in a switched network by blocking redundant paths.