Cisco
300-415 · Question #142
300-415 Question #142: Real Exam Question with Answer & Explanation
The correct answer is D: Four data packets, one parity packet. In a single FEC (Forward Error Correction) block in Cisco SD-WAN, there are typically four data packets and one parity packet.
Policies
Question
How many packets are in a single FEC block?
Options
- AOne data packet, one parity packet
- BOne data packet, four parity packets
- CTwo data packets, one parity packet
- DFour data packets, one parity packet
- EThe value is configurable in the policy.
Explanation
In a single FEC (Forward Error Correction) block in Cisco SD-WAN, there are typically four data packets and one parity packet.
Common mistakes.
- A. This option describes a 1+1 FEC scheme, which is not the default or common FEC block structure in Cisco SD-WAN.
- B. This option describes a 1+4 FEC scheme, which would generate too many parity packets for typical SD-WAN deployments and is not the standard.
- C. This option describes a 2+1 FEC scheme, which is not the default or common FEC block structure in Cisco SD-WAN.
- E. While some parameters of FEC might be tunable or chosen, the question asks about how many packets are in a single FEC block, implying the standard or common configuration, which is 4 data packets and 1 parity packet in Cisco SD-WAN.
Concept tested. Cisco SD-WAN FEC block structure
Topics
#FEC#SD-WAN#Packet loss mitigation#Data policy
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