Access lists are not used just to determine which packets will be forwarded to a destination. On a slow network connection where bandwidth is at a premium, access lists are used to determine the order in which traffic is scheduled to leave the interface. Unfortunately, some of the packets may time out. Therefore, it is important to carefully plan the prioritization based on your understanding of the network. It is important to ensure that the most sensitive traffic (that is, traffic most likely to time out), such as IBM's Systems Network Architecture (SNA), is handled first.

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