JN0-102 · Question #66
Which statement is true about logical units?
The correct answer is B. A logical unit is required for transit interfaces. Logical units are essential for configuring IP addresses and other layer 3 properties on an interface, especially when that interface is intended to forward traffic.
Question
Which statement is true about logical units?
Options
- ALogical units are similar to VLANs used by other vendors.
- BA logical unit is required for transit interfaces.
- CFrame Relay encapsulation supports one logical unit.
- DLink speed and duplex are configured in the logical unit properties.
How the community answered
(24 responses)- A4% (1)
- B92% (22)
- D4% (1)
Why each option
Logical units are essential for configuring IP addresses and other layer 3 properties on an interface, especially when that interface is intended to forward traffic.
While both logical units and VLANs involve segmentation, logical units in Junos OS are primarily about creating multiple logical interfaces on a single physical port for different protocols or routing instances, whereas VLANs are a Layer 2 segmentation technology.
For an interface to function as a transit interface and carry IP traffic, it must have at least one logical unit configured with an IP address, as logical units represent the logical endpoints for layer 3 protocols on a physical interface.
Frame Relay encapsulation supports multiple logical units, with each logical unit typically corresponding to a Data Link Connection Identifier (DLCI).
Link speed and duplex settings are physical layer properties configured at the physical interface level, not within the logical unit properties, which primarily deal with Layer 3 and higher layer settings.
Concept tested: Junos OS logical units and transit interfaces
Source: https://www.juniper.net/documentation/us/en/software/junos/interfaces-fundamentals/topics/topic-map/logical-interfaces-overview.html
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