Data Link Layer
IP, AppleTalk, IPX
• tests Layer 2 connectivity • enabled by default on each interface • provides information on directly connected devices that have CDP enabled
datalink layer
Network layer
TCP operates at transport layer
CDP
None, they communicate to the layer 7, however they do not operate at that layer(application)
IGMP
generally layer 4, but SOCKS operates at layer 5, which allows it to work well with applications
Layer 7, Aplication
router operates on Layer 3 and can be used as a switch