Network Layer
- The network layer handles communication
with device on logically separate networks that are connected to form
internetworks.
- Because internetworks can be large and
can be constructed of different types of networks.
- The network layer utilizes algorithm that
guide packets from their source to their destination networks.
- Within the network layer each network in
the internetworks is assigned a network address that is used to route
packets.
- The network layer manages the process of
addressing [networking] and delivering packets on internetworks.
- On the layer network, it is impractical
to deliver network data solely by means of physical address.
- Larger networks require a means of
routing and filtering packets to reduce network traffic and minimize
transmission time.
- The network layer uses logical network
address to route packets to specific networks on an internet layer.
- The network layer also support service
address, the operating system on most computers can run several processes at
once.
- These service addresses are included with
the physical and logical network address in the data frame.
- Some service address, called well known
addresses is universally defined for a given type of networks.
These well known addresses are often used for
service that is shared between many different vendors.