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The most frequent technique of configuring ISDN is with dialer maps, but dial data can also be configured on a logical interface. To pass the CCNA exam, you need to know how to configure and troubleshoot each dialer maps and dialer profiles. Dialer Profiles enable distinct dialing info to be configured onto logical interfaces. The logical interfaces might have distinct dialing destinations, diverse remote router names, etc., but theyll be utilizing the same physical interface. Dialer strings are used on dialer profiles. Note that every logical interface has a different IP address, a different remote router to dial, and a distinct dialer string, but they will be employing the very same physical interface to dial out. The commands dialer pool and dialer pool-member are employed to link the logical and physical interfaces. The quantity following each and every command must match for the logical interface to appropriately bind to the physical interface. R1(config)#interface dialer0 R1(config-if)#ip address 172.16.1.1 255.255.255. R1(config-if)#encapsulation ppp &lt;. The encapsulation type is placed on both the logical and physical interfaces.&gt; R1(config-if)#dialer remote-name Remote0 R1(config-if)#dialer pool 1 &lt; places logical interface into dialer pool&gt; R1(config-if)#dialer string 5551212  [http://www.purevolume.com/parade81cheese/posts/4313851/DIY+Burglar+Alarm+Kit%3A+Keeping+Your+Home+Safe+and+Sound+ advertisers]  &lt; number dialed to contact router Remote0&gt; R1(config-if)#dialer-group 1 &lt; links logical interface to dialer-list 1&gt; R1(config)#interface dialer1 R1(config-if)#ip address 172.16.1.2 255.255.255. R1(config-if)#encapsulation ppp R1(config-if)#dialer remote-name Remote1 R1(config-if)#dialer pool 1 R1(config-if)#dialer string 5551234 R1(config-if)#dialer-group 1 R1(config)#interface bri0 R1(config-if)#no ip address &lt; With dialer profiles, IP addresses are assigned to logical interfaces.&gt; R1(config-if)#encapsulation ppp &lt; The encapsulation type is place on both the logical and physical interfaces.&gt; R1(config-if)#dialer pool-member 1 &lt; The number associated with this command should match the number configured with the dialer pool number on the logical dialer interfaces.&gt; R1(config-if)#isdn spid1 0835866101 R1(config-if)#isdn spid2 0835866301 When configuring dialer profiles, the encapsulation sort really should be placed on each the physical BRI interface and the logical dialer interfaces. The SPIDs are configured on the physical interface as properly. Configuring dialer profiles can be a little tricky at initial, and the greatest way to master this skill is to get true hands-on practice in your personal CCNA / CCNP property lab or a rack rental service. Either way, hands-on is the very best practice. Best of luck in your CCNA reports!