When designing a WAN that will be carrying real-time traffic, what are two important reasons to consider serialization delay? (Choose two)

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.

Serialization delay is variable because it is a function of both the line rate of the interface and the size of the packet; a larger packet on the same line rate produces a proportionally longer delay, directly impacting jitter-sensitive real-time traffic. Understanding this variability is essential when designing QoS mechanisms such as link fragmentation and interleaving for WAN links.

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.

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.

Serialization delay depends on both the line rate and the packet size together - neither factor alone determines the actual delay, which is calculated as packet size in bits divided by line rate in bits per second. This dual dependency means that even on higher-speed links, large data packets competing with small real-time packets can impose significant and variable serialization delays.