Spanning-tree port type network and normal

Network Port:-

Switchport connected to other switches and bridges via point to point link should be configured as network port. 

It can be enable per interface basis we well as in global mode.

As soon as we configure network port, it enables the bridge assurance.

Bridge assurance is used to prevent unidirection link. Port on which bridge assurance is configured, send BPDU no matter it is in alternate and backup port. It the port didn't receive BPDU from other end it will move in blocking state and will resume the running state when it start receiving the BPDUs.

       If network port is configured on the switchport connected to a host, it will move it to blocking state as it will not receive the BPDU from host machine.

  Normal port :-

Switchport which will go through all STP stages. It is the default switchport state.

Switchport connected to switchport or bridge is configured as normal port. One exception is VPC peer link which is configured by default as network port.

It is used as the backup compatibility for the switches which do not support switchport type network.