CCNP : Notes...
2.
The typical three-layer hierarchical internetworking model consists
of the following:
-
Core layer:
Core layer is responsible to provide an optimal and reliable
transport structure. The core layer is the backbone network of
the entire internetwork and may include LAN and WAN backbones.
Core layer usually consists of fully redundant paths with
technologies such as FDDI, Fast Ethernet, and/ or ATM.
-
Distribution
layer: Distribution layer is responsible to provide access to
the internetwork as well as to the servers. Distribution layer
sits between the Core layer and the Access layer. The policies
such as ACLs are implemented at the distribution layer.
Distribution layer is also known as workgroup layer.
-
Access
layer, provides the users, access to the resources on
internetwork.
In real world, a single device may be
functioning at both Access layer as well as distribution layer. This
is true for even Core layer.
3.
Network segmentation:
Network
congestion can be addressed by segmentation of the network. Network
segmentation, also called micro segmentation, can be done by using:
-
Bridges,
-
Routers, and
-
Switches.
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