A network administrator connects two Cisco Catalyst switches via their GigabitEthernet0/1 interfaces. Switch-A is configured with `switchport mode dynamic desirable`, while Switch-B remains in its default `dynamic auto` mode. What is the correct chronological sequence of operational events during Dynamic Trunking Protocol (DTP) negotiation to establish an IEEE 802.1Q trunk link?
- 1Switch-A generates and transmits a DTP frame on GigabitEthernet0/1 actively requesting to form a trunk link.
- 2Switch-B receives the DTP frame on its `dynamic auto` interface and parses the incoming negotiation parameters.
- 3Switch-B transmits a DTP acknowledgment frame confirming agreement to establish a trunk link.
- 4Both switches compare supported trunking encapsulation types and agree upon IEEE 802.1Q operation.
- 5Both switch interfaces transition their operational mode from access to trunk and begin forwarding multi-VLAN traffic.
Cevap
The correct sequence is: Switch-A transmits a DTP frame requesting a trunk, Switch-B receives and parses the DTP frame, Switch-B transmits a DTP acknowledgment frame, both switches agree upon IEEE 802.1Q encapsulation, and finally both switch interfaces transition to the operational trunk state.
The correct order follows the DTP state machine negotiation flow. A port in `dynamic desirable` mode actively sends DTP request frames to its link partner. The neighboring port in `dynamic auto` mode receives and processes this request, responding with a DTP acknowledgment frame to consent to trunking. Following parameter exchange, both switches negotiate the trunk encapsulation (IEEE 802.1Q) and finally transition both interface operational states to trunking.
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Anahtar Kavram
Dynamic Trunking Protocol (DTP) negotiation flow between dynamic desirable and dynamic auto interface modes in IEEE 802.1Q trunking.
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