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CCDA Notes : cont... 48. Data Link Switching (DLSw) was introduced by IBM to overcome the limitations of  SRB networks. The Cisco implementation of DLSw is called DLSw+. Benefits of DLSW+ are over SRB are: Link layer acknowledgements and keep-alive messages of SNA do not have to travel over WAN link, DLSw+ traffic can be rerouted in case of link failures Prioritization of traffic over WAN links 49.  The permitted numbers for some important access-lists are: -         1-99: IP standard access list -         100-199 :IP extended access list -         600-699: AppleTalk Access list -         800-899 : IPX standard access list -         900-999 : IPX extended access list -         1000-1099: IPX SAP access list -         1100-1199: Extended 48-bit MAC address access list   The format for standard IPX access list is: access-list {number} {permit/ deny} {source} {destination}