400-007 · Question #72
You want to split an Ethernet domain in two. Which parameter must be unique in this design to keep the two domains separated?
The correct answer is D. VLAN ID. To split an Ethernet network into two separate broadcast domains, each domain must be assigned a unique VLAN ID, which is the tag that logically separates Layer 2 traffic at the switch level.
Question
You want to split an Ethernet domain in two. Which parameter must be unique in this design to keep the two domains separated?
Options
- AVTP domain
- BVTP password
- CSTP type
- DVLAN ID
How the community answered
(25 responses)- B8% (2)
- C4% (1)
- D88% (22)
Why each option
To split an Ethernet network into two separate broadcast domains, each domain must be assigned a unique VLAN ID, which is the tag that logically separates Layer 2 traffic at the switch level.
The VTP domain name controls which switches participate in sharing the VLAN database via VTP, but it does not itself segment or isolate Ethernet broadcast domains from each other.
A VTP password authenticates VTP neighbors to prevent unauthorized VLAN database synchronization, but it does not create or enforce any Layer 2 domain boundary.
The STP type (PVST+, RSTP, MST) determines how Layer 2 loops are prevented, but differing STP types between segments do not create logical separation of Ethernet broadcast domains.
A VLAN ID is the 802.1Q tag that defines broadcast domain membership at Layer 2. By assigning distinct VLAN IDs to each segment, switches forward frames only within the same VLAN, effectively creating two isolated Ethernet domains on the same physical infrastructure without requiring separate hardware.
Concept tested: VLAN ID as Layer 2 broadcast domain boundary
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swvlan.html
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