© 2006 Cisco Systems, Inc. All rights reserved. ICND v2.37-1 Module Summary ISDN uses end-to-end digital technology to allow for faster call setup times.

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© 2006 Cisco Systems, Inc. All rights reserved. ICND v Module Summary ISDN uses end-to-end digital technology to allow for faster call setup times. DDR routes packets and exchanges routing updates on an as-needed basis. DDR addresses the need for periodic network connections over a circuit-switched WAN service.

© 2006 Cisco Systems, Inc. All rights reserved. ICND v2.37-2