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A company has decided to buy a local access rate of T1 and a CIR of 512Kbps from a certain Telco (ISP). Which of the following would best describe how the traffic sent will be delivered?
any rate from 512Kbps up to 1.544Mbps is guaranteed to be delivered
the first 512Kbps traffic is guaranteed to be delivered, any rate above and up to the T1 rate may or may not be delivered
any rate up to T1 rate of 1.544Mbps is guaranteed to be delivered, any traffic above the T1 rate is dropped
the first 512Kbps traffic up to 1.544Mbps is guaranteed to be delivered
Committed Information Rate (CIR) is the rate at which a Frame Relay switch is able to transfer data. It is the guaranteed rate of traffic that can be delivered within a Local Access Rate (LAR). For example, a CIR of 512Kbps is guaranteed to be delivered. Any rate above (burst) the CIR up to the LAR may or may not be delivered. The reason for this is that a traffic marked as DE or Discard Eligible will be discarded if the network suffers traffic congestion. So any rate above 512Kbps (up to 1.544Mbps; T1) which is also called "burst" are marked with a DE bit set (1). (CCNA: Cisco Certified Network Associate FastPass By Todd Lammle. Pg. 53)
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