Unicast
One station talking to another station
Broadcast
Send one piece of information to all other devices on the network
Broadcast domain
limits scope of broadcast
multicast
delivery information to interested system
Anycast
single destination IP address has multiple paths to two or more endpoints
One to one of many
Anycast DNS
Class A
Leading bits
1-127
Class B
Leading bits
128-191
Class C
Leading bits
192-223
Class D
224-239
Class E
240-254
CIDR notation
CIDR block
/24
/32
/16
VLSM
Variable Length Subnet Masks
Allow network admin to define their own mask