Which two statements are true regarding the default VLAN in EX Series switches?

The first statement is true because in EX Series switches, all switch ports that have not been explicitly assigned to a user-defined VLAN will indeed belong to the default VLAN, which is VLAN 1 by default. This concept is crucial for network management, as it establishes a baseline where any unassigned ports will still participate in the network through this default configuration.

While one might consider that the default VLAN providing a default behavior is important, the statements regarding the possibility of changing the VLAN ID or the characteristics of tagged traffic do not hold true. Therefore, a deeper understanding of default VLAN behavior and its role in various configurations is beneficial for managing a network effectively. The focus must ultimately be maintained on how unassigned ports behave regarding VLAN membership, which is clearly articulated in the true statement regarding the default VLAN.