JN0-102 · Question #184
What are three physical interface properties? (Choose three.)
The correct answer is A. payload scrambling C. FCS D. link speed. Physical interface properties include payload scrambling, Frame Check Sequence (FCS) mechanisms, and link speed.
Question
What are three physical interface properties? (Choose three.)
Options
- Apayload scrambling
- Bvirtual circuit identifier
- CFCS
- Dlink speed
- EIP address
How the community answered
(60 responses)- A93% (56)
- B3% (2)
- E3% (2)
Why each option
Physical interface properties include payload scrambling, Frame Check Sequence (FCS) mechanisms, and link speed.
Payload scrambling is a physical layer technique used to ensure sufficient bit transitions for clock recovery and reduce EMI, making it a physical interface property.
A virtual circuit identifier (VCI) is a Layer 2 (e.g., ATM) or Layer 2.5 (e.g., MPLS) identifier for a logical connection, not a direct physical interface property.
Frame Check Sequence (FCS) is a field in data link layer frames that ensures data integrity over the physical medium by detecting transmission errors, making it a property closely tied to physical transmission.
Link speed (e.g., 1 Gbps, 10 Gbps) is a fundamental characteristic of the physical layer that determines the rate at which data is transmitted over the interface.
An IP address is a Layer 3 (network layer) property used for logical addressing and routing, distinct from the physical characteristics of an interface.
Concept tested: Junos physical interface properties
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-interfaces/topics/topic-map/interfaces-physical-overview.html
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