Key Terms

Before you take the exam, be sure you’re familiar with the following terms:

20/80 rule	enterprise services
80/20 rule	hierarchy
access layer	layer 2 switching
application-specific integratedcircuits (ASICs)	layer 3 switching
bandwidth	layer 4 switching
Cisco hierarchical model	layered
collapsed core	local services
core block	Media Access Control (MAC)
core layer	multi-layer switching
data encapsulation	Open Systems Interconnection (OSI) model
distribution layer	remote services
	switch block