Terms you'll need to understand:
Firewalls, routers, and switches
Wireless
Modem
RAS
Telecom/PBX
VPN
IDS
Network Monitoring/Diagnostics
Workstations, servers, and mobile devices
Coaxial, UTP/STP, and fiber cable
Removable media
Security zones
VLAN
NAT
Tunneling
Techniques you'll need to master:
Understanding the basic security concepts of communication and network devices
Being familiar with the basic security concepts of media
Understanding the basic security concepts of network and storage media devices
Knowing the basic security concepts, strengths, and vulnerabilities of security topologies
Being able to explain the strengths and vulnerabilities of various security zones and devices