单选题Which statement is correct about logical units on Juniper Router interfaces?（）ALogical units are used only when a Layer 2 identifier is present such as a VLANBA logical unit of 0 is required when using a frame-relay DLCICA logical unit is always requiredDLogical units are not required unless ATM or 802.1Q VLAN tagging is configured.
单选题
Which statement is correct about logical units on Juniper Router interfaces?（）
A
Logical units are used only when a Layer 2 identifier is present such as a VLAN
B
A logical unit of 0 is required when using a frame-relay DLCI
C
A logical unit is always required
D
Logical units are not required unless ATM or 802.1Q VLAN tagging is configured.
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