Cisco
400-007 · Question #47
400-007 Question #47: Real Exam Question with Answer & Explanation
The correct answer is B: Serialization delays are variable because they depend on the line rate of the interface and on the. Serialization delay on WAN links carrying real-time traffic is variable because it is jointly determined by both the interface line rate and the packet size, making large packets on slow links a critical QoS concern.
Question
When designing a WAN that will be carrying real-time traffic, what are two important reasons to consider serialization delay? (Choose two)
Options
- ASerialization delays are invariable because they depend only on the line rate of the interface
- BSerialization delays are variable because they depend on the line rate of the interface and on the
- CSerialization delay is the time required to transmit the packet on the physical media.
- DSerialization delays are variable because they depend only on the size of the packet being
- ESerialization delay depends not only on the line rate of the interface but also on the size of the
Explanation
Serialization delay on WAN links carrying real-time traffic is variable because it is jointly determined by both the interface line rate and the packet size, making large packets on slow links a critical QoS concern.
Common mistakes.
- A. Serialization delay is not invariable; it changes with packet size even at a constant line rate, so claiming it depends only on line rate and is therefore fixed is factually incorrect.
- C. While this correctly defines serialization delay as the time to place a packet onto the physical media, it does not address the variability or dual dependency on line rate and packet size that makes it a critical design concern for real-time traffic.
- D. Serialization delay is not determined by packet size alone; it is the ratio of packet size to line rate, so omitting the line rate component provides an incomplete and misleading characterization of the delay.
Concept tested. WAN serialization delay variability for real-time QoS design
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