Understanding nonegotiate , turn of DTP on Switch

Understanding : nonegotiate.

Switch#show int g0/1 switchport
Name: Gig0/1
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: negotiated
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)


Switch(config-if)#switchport ?
  access         Set access mode characteristics of the interface
  mode           Set trunking mode of the interface
  native         Set trunking native characteristics when interface is in
                 trunking mode
  nonegotiate    Device will not engage in negotiation protocol on this
                 interface
  port-security  Security related command
  trunk          Set trunking characteristics of the interface
  voice          Voice appliance attributes
  <cr>
Switch(config-if)#switchport nonegotiate
Command rejected: Conflict between 'nonegotiate' and 'dynamic' status.
Switch(config-if)#switchport mode access
Switch(config-if)#switchport nonegotiate
Switch(config-if)#



Switch#show int g0/1 switchport
Name: Gig0/1
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: negotiated
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none


Example 2 :

Switch#show int g0/2 switchport
Name: Gig0/2
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: down
Administrative Trunking Encapsulation: negotiated
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none

Switch(config)#int g0/2
Switch(config-if)#switchport nonegotiate
Command rejected: Conflict between 'nonegotiate' and 'dynamic' status.
Switch(config-if)#switchport mode ?
  access   Set trunking mode to ACCESS unconditionally
  dynamic  Set trunking mode to dynamically negotiate access or trunk mode
  trunk    Set trunking mode to TRUNK unconditionally
Switch(config-if)#switchport mode dynamic ?
  auto       Set trunking mode dynamic negotiation parameter to AUTO
  desirable  Set trunking mode dynamic negotiation parameter to DESIRABLE
Switch(config-if)#switchport mode dynamic desirable
Switch(config-if)#switchport nonegotiate
Command rejected: Conflict between 'nonegotiate' and 'dynamic' status.
Switch(config-if)#switchport mode trunk
Switch(config-if)#switchport nonegotiate
Switch(config-if)#no switchport mode trunk
Command rejected: An interface must be configured to the Access or Trunk    modes to be configured to NoNegotiate.