Posts Tagged ‘switch’
August 15th, 2008 | 
Author: LAN Design:
The Hierarchical Network Model:
CCNA focuses on networks for SMBs (small, medium businesses).
A hierarchical design model is recommended.
Easier to manage and expand.
Problems are solved more quickly.
Hierarchical design divides the network into 3 layers.
Core, (CL).
Distribrution, (DL).
Access, (AL).
Each layer provides specific functions.
This “modularity” facilitates scalability and performance.
Access Layer, (AL): lowest
Interfaces with the end device (user).
Includes routers, switches, bridges, hubs and wireless APs.
Provides a means of connecting devices to the network and controlling which one communicate on the network.
Wide Area Networks and FRAME RELAY
Frame Realy is the #1 WAN technology worldwide.
Used by all sizes of customers because the Total Cost of Ownership is flexible.
Frame Relay reduces costs by using less equipment, less complexity, & easier implementation than leased lines. It also provides greater reliability, & resilience.
COST EFFECTIVENESS
Frame Relay solutions provide cost effectiveness & flexibility.
With dedicated lines, customers pay for an end to end connection including the local loop & network link.
1.With frame relay you pay for the local loop & for bandwidth.
The Distance between nodes isn’t important.
Lease lines – increments of 64kbs Frame Relay VC(Virtual Connection) are defined with greater granularity, increments as small as 4kbs can be used.
2.Frame Relay is also cost effective in that it shares bandwidth across a larger base of customers.
Using dedicated lines require more DSU/CSU & more complicated routing & switching