What is the Network Layer of the OSI reference model primarily
responsible for?

A.
SMTP Gateway services

B.
LAN bridging

C.
Internetwork packet routing

D.
Signal regeneration and repeating

Explanation:
Although many routers can perform most of the functions above, the
OSI Network layer is primarily responsible for routing.
* LAN bridging, is a Data Link Layer function.
* gateways, most commonly function at the higher layers.
* signal regeneration and repeating, is primarily a Physical layer function. Source: CCNA Study
Guide by Todd Lammle, Donald Porter, and James Chellis (Sybex, 1999).