200-301 Question 179
Single answerYou are configuring a new switch in your network and notice that some devices connected to the switch are not communicating with each other. Upon investigation, you find that all interfaces are assigned to VLAN 1 by default. Which of the following statements about the default VLAN is correct?
- A
VLAN 1 is the default VLAN for all ports on a Cisco switch unless explicitly assigned to another VLAN.
- B
The default VLAN cannot be used for management traffic, such as accessing the switch via Telnet or SSH.
- C
VLAN 1 can be deleted from the switch to prevent its use in the network.
- D
By default, all untagged traffic on trunk ports is assigned to VLAN 1.
Show answer and explanation
Correct answer: A
Explanation
VLAN 1 is the default VLAN for all switch ports on Cisco switches unless explicitly configured otherwise. It is a reserved VLAN and cannot be deleted. While it is commonly used for management traffic and untagged traffic on trunk ports, those behaviors can be reconfigured. Understanding the role and limitations of VLAN 1 is essential for effective switch management.
- A. Correct.
Correct. VLAN 1 is the default VLAN for all switch ports on a Cisco switch unless they are explicitly assigned to another VLAN. This is a fundamental behavior of Cisco switches.
- B. Incorrect.
Incorrect. VLAN 1 is often used for management traffic unless another VLAN is explicitly configured for that purpose. This statement is misleading.
- C. Incorrect.
Incorrect. VLAN 1 cannot be deleted from a Cisco switch. It is a reserved VLAN and always exists on the device.
- D. Incorrect.
Incorrect. Although VLAN 1 is often used as the default VLAN for untagged traffic, this behavior can be changed by configuring a different native VLAN on trunk ports.