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In preparation of your CCNA exam, we want to make sure we cover the various concepts that we could see on your Cisco CCNA exam. So to assist you, below we will discuss one of the more difficult CCNA concepts; Dial on Demand. As you progress through your CCNA exam studies, I am sure with repetition you will find this topic becomes easier. So even though it may be a difficult concept and confusing at first, keep at it as no one said getting your Cisco certification would be easy!

Short for Dial-on-Demand Routing. DDR is a routing technique developed by Cisco that allows a user to utilize existing telephone lines, or public circuit-switched networks, to form a WAN instead of lines that are dedicated specifically to the WAN. DDR is typically implemented by users that do not need permanent, continuous links between sites on the WAN because the volume of traffic over the WAN is low and the transmissions are periodic as opposed to continuous. The connection only becomes active when data is sent to the remote site. When no data has been sent over the link for a specified amount of time, the link is disconnected.

Using DDR, a connection between sites is only established when a specific type of traffic initiates the call or when you a backup link is needed for redundancy or load sharing.

DDR is used in order to save on the costs of a dedicated WAN line for organizations that do not need permanent continuous connection and as a back-up by organizations that use the dedicated line for critical applications.


version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
hostname R2
aaa new-model
aaa authentication login default local
aaa authentication ppp default local
username admin privilege 15 password 7 < deleted>
username R3 password 7 < deleted>

!— For CHAP, passwords must be the same on both routers.

ip subnet-zero
isdn switch-type basic-5ess
interface Ethernet0
ip address
interface BRI0
ip address
encapsulation ppp
dialer map ip name R3 6663000
dialer-group 1
isdn switch-type basic-5ess
ppp authentication chap

ip classless
ip route
dialer-list 1 protocol ip permit
line con 0
stopbits 1
line aux 0
line vty 0 4

I hope you found this article to be of use and it helps you prepare for your Cisco CCNA certification. Achieving your CCNA certification is much more than just memorizing Cisco exam material. It is having the real world knowledge to configure your Cisco equipment and be able to methodically troubleshoot Cisco issues. So I encourage you to continue in your studies for your CCNA exam certification.