1.1.c Explain general network challenges

1.1.c [ii] Out of order packets

Using per-packet load balancing to share the traffic load across available paths to a given destination can lead to out-of-order packets for a given data flow.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 980-981).  . Kindle Edition.