101 · Question #567
Ethernet frame FCS errors occur when which calculation fails?
The correct answer is B. CRC. Ethernet FCS errors are detected when the receiver's recalculated CRC value does not match the FCS field appended by the sender, indicating frame corruption during transmission.
Question
Ethernet frame FCS errors occur when which calculation fails?
Options
- AFSCM
- BCRC
- CCSR
- DHSTS
How the community answered
(26 responses)- B88% (23)
- C8% (2)
- D4% (1)
Why each option
Ethernet FCS errors are detected when the receiver's recalculated CRC value does not match the FCS field appended by the sender, indicating frame corruption during transmission.
FSCM is not a recognized algorithm or standard in IEEE 802.3 or any Ethernet framing specification.
The Frame Check Sequence field in an IEEE 802.3 Ethernet frame contains a 32-bit CRC-32 value computed over the frame's address, type, and data fields. The receiving NIC independently computes the CRC over the same fields and compares it to the FCS value - if they differ, an FCS error is reported, flagging the frame as corrupted during transit.
CSR stands for Certificate Signing Request in PKI contexts, and has no role in Ethernet frame integrity verification.
HSTS is HTTP Strict Transport Security, a web application security header policy that operates at Layer 7 and is entirely unrelated to Layer 2 frame error detection.
Concept tested: Ethernet Frame Check Sequence and CRC-32 error detection
Source: https://standards.ieee.org/ieee/802.3/10422/
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