Posts Tagged ‘frame’
August 26th, 2008 | 
Author: Key Elements of Ethernet Networks:
CSMA/CD – Only used with half-duplex (hubs).
Full-duplex switches do not use CSMA/CD.
Ethernet signals are sent to every host in the LAN.
Carrier Sense:
All devices must listen before transmitting.
If signal detected (CS), wait before transmitting.
If no tfc detected, can transmit.
While transmitting – must listen for collisions.
Multi-access:
If 2 devices transmit at the same time = collision.
Collision Detection:
Other devices (not involved in collision), and transmitting devices, detect collision.
Tags: study, vtp, 802.1q, guides, switch, cisco
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
Tags: 802.1q, router, guides, vlan, wan, ip