Which one of the following is true regarding VLANs?
2025
Which one of the following is true regarding VLANs?
- A.
Two VLANs are configured by default on all Cisco switches.
- B.
VLANs only work if you have a complete Cisco switched internetwork. No off-brand switches are allowed.
- C.
You should not have more than 10 switches in the same VTP domain.
- D.
VTP is used to send VLAN information to switches in a configured VTP domain.
Show answer & explanation
Correct answer: D
VLANs (Virtual LANs) divide a switched network into separate broadcast domains at Layer 2. Because every switch would otherwise need each VLAN configured on it individually, Cisco's VLAN Trunking Protocol (VTP) lets participating (client- or server-mode) switches within the same VTP domain automatically learn and synchronize VLAN information — VLAN IDs and names — that a VTP server switch advertises over trunk links.
Applying this to the statements given: the claim that VTP sends VLAN information to switches in a configured VTP domain is exactly how VTP operates, so that statement is the true one.
Cisco switches do not come with exactly two VLANs configured by default — only VLAN 1 is available for regular use out of the box — so the claim of two default VLANs does not hold.
VLAN operation follows the vendor-neutral IEEE 802.1Q standard, so a switched network can mix Cisco and non-Cisco switches — VLANs are not restricted to an all-Cisco internetwork.
VTP domain size has no fixed cap of 10 switches; the practical limit depends on network design and management practice, not a hard-coded switch count.
So among the four statements, only the one describing VTP propagating VLAN information across a configured domain is technically accurate.