I have flag this Question for off topic But It was rejected. But it looks like a off topic because question does not contain any thing about Network engineering.
I flagged because of this point "
NE is a site for to ask and provide answers about professionally managed networks in a business environment. Your question falls outside the areas our community decided are on topic. Please visit the help center for more details. If you disagree with this closure, please ask on Network Engineering Meta.
But Someone can argue about this point in help center under on topic.
tools used by network professionals
I understand mentioned point in this way. "Packet Tracer is not professional simulator, Although it is professional question looks like a appearance of the packet tracer, It is not involving anything about NE. It could be resolution changes in his computer."