Cisco CCNP Certification

Cisco Exam Tutorial Root Bridge Election

Error detection schemes check errors in the data packets by reading which field
frame IDs?

A. MTU
B. PDU
C. FCS
D. Flag
E. MAC
F. BRI

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Answer: C

Explanation:
Frame Check Sequence (FCS) field
Ethernet uses a CyclicRedundancyCheck (CRC) algorithm to detect transmission errors.
The FrameCheckSequence field is filled (using a CRC) by the sending host. If the
receiving host detects a wrong CRC, it will throw away that packet.
Incorrect Answers:

A. MTU is the Maximum Transmission Unit, which is set to 1500 bytes by default for
ethernet packets.
B, D. This is not part of the data packet.
E. This is the Media Access Control, which is used most often to describe the layer 2
physical address of a device.
F. BRI is related to an ISDN connection, describing a ciircuit with 2 bearer channels and
a single data channel. It has absolutely nothing to do with error correction in a data
packet.

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