When Layer 2 (L2) Connection mode is enabled, which parameters are used in addition to the standard 4-tuple?

When Layer 2 (L2) Connection mode is enabled, which parameters are used in addition to the standard 4-tuple?

• A. The IP address and subnet mask
• B. Only the MAC address
• C. The Layer 2 parameters: channel number, MAC address, and VLAN ID
• D. Only VLAN ID

Answer: (C)

Layer 2 Connection mode adds data-link layer metadata to distinguish a connection beyond the standard four-tuple. In this mode, you still consider the core identifiers, but you also bring in Layer 2 details: the channel number, the MAC address, and the VLAN ID. The channel number differentiates multiple logical channels within the same MAC/VLAN, the MAC address pinpoints the exact device on the local network, and the VLAN ID ensures traffic is scoped to the correct broadcast domain. IP addresses and subnet masks belong to the Layer 3 (and above) realm and aren’t part of the Layer 2 augmentation here. Relying on just the MAC address or just the VLAN ID wouldn’t uniquely identify a connection in L2 mode without the channel context, so all three Layer 2 parameters are used together with the standard 4-tuple.

Layer 2 Connection mode adds data-link layer metadata to distinguish a connection beyond the standard four-tuple. In this mode, you still consider the core identifiers, but you also bring in Layer 2 details: the channel number, the MAC address, and the VLAN ID. The channel number differentiates multiple logical channels within the same MAC/VLAN, the MAC address pinpoints the exact device on the local network, and the VLAN ID ensures traffic is scoped to the correct broadcast domain. IP addresses and subnet masks belong to the Layer 3 (and above) realm and aren’t part of the Layer 2 augmentation here. Relying on just the MAC address or just the VLAN ID wouldn’t uniquely identify a connection in L2 mode without the channel context, so all three Layer 2 parameters are used together with the standard 4-tuple.