Cisco Enterprise Network Core Technologies (ENCOR) 2025 – 400 Free Practice Questions to Pass the Exam

Layer 2 trunks can carry 802.1P marking, which is crucial for quality of service (QoS) in Ethernet networks. The 802.1P standard allows for prioritization of traffic by marking frames with a 3-bit priority code point (PCP), enabling the network to manage bandwidth and optimize performance for more critical data types.

In a Layer 2 trunking environment, multiple VLANs (Virtual Local Area Networks) can be carried over a single physical link, which means that the 802.1P markings can be preserved across these trunks, allowing switches to effectively manage QoS based on the priority tags associated with each frame.

Layer 1 trunks, on the other hand, operate at the physical layer and carry raw bit streams without understanding of frame formats or QoS markings. Layer 3 trunks involve routing and typically deal with IP packets rather than link-layer frames, thus are not relevant for carrying 802.1P markings. Layer 4, which deals with transport layer protocols, also does not directly relate to the marking used for local area network traffic prioritization.

Consequently, the ability of Layer 2 trunks to process these priority markings makes them the correct answer in this context.