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Which of the following modes are valid when a switch port is used as a VLAN trunk?
  1. Blocking
  2. Dynamic auto
  3. Dynamic desirable
  4. Nonegotiate
  5. Access
  6. Learning
  • a)
    1, 2 and 6
  • b)
    2, 3 and 4
  • c)
    4, 5 and 6
  • d)
    2, 4, and 5
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following modes are valid when a switch port is used as a...
The valid modes of a VLAN trunk on a switch are dynamic auto, dynamic desirable, trunk (on), and nonegotiate.
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Which of the following modes are valid when a switch port is used as a...
Explanation:

When a switch port is used as a VLAN trunk, it means that the port will carry traffic for multiple VLANs. In this scenario, there are certain modes that can be used on the switch port to facilitate the trunking process. The valid modes for a VLAN trunk port are as follows:

Dynamic Auto:
- This mode allows the switch port to negotiate whether to form a trunk or operate as an access port.
- If the neighboring switch port is set to "Dynamic Desirable" or "Trunk", the port will form a trunk.
- If the neighboring switch port is set to "Access" or "Dynamic Auto", the port will operate as an access port.

Dynamic Desirable:
- This mode actively tries to form a trunk with the neighboring switch port.
- If the neighboring switch port is set to "Dynamic Auto", it will form a trunk.
- If the neighboring switch port is set to "Trunk" or "Access", it will negotiate the trunking process.

Nonegotiate:
- This mode disables the trunk negotiation process.
- The switch port will always operate as a trunk and will not attempt to negotiate with the neighboring switch port.

Access:
- This mode is not valid for a VLAN trunk.
- It is used to connect end devices to the switch port and restricts the port to a single VLAN.

Learning:
- This mode is not valid for a VLAN trunk.
- It is used in dynamic VLAN membership modes to dynamically learn VLAN assignments.

Blocking:
- This mode is not valid for a VLAN trunk.
- It is used in the Spanning Tree Protocol (STP) to prevent loops by blocking certain switch ports.

Therefore, the valid modes for a VLAN trunk port are Dynamic Auto, Dynamic Desirable, and Nonegotiate. These modes allow the switch port to negotiate trunking with the neighboring switch port or operate as a trunk without negotiation. Access, Learning, and Blocking modes are not applicable for VLAN trunk ports. Hence, the correct answer is option 'B' - 2, 3, and 4.
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Which of the following modes are valid when a switch port is used as a VLAN trunk? Blocking Dynamic auto Dynamic desirable Nonegotiate Access Learninga)1, 2 and 6b)2, 3 and 4c)4, 5 and 6d)2, 4, and 5Correct answer is option 'B'. Can you explain this answer?
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