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CCIE Security Exam Certification Guide by Henry Benjamin

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Basic ISDN Configuration (0.5 Hours)

ISDN switch information:

  • ISDN switch type: basic-5ess.

  • ISDN numbering:

    - R1: 0298017705

    - R4: 0296307050

  • SPIDs are not required.

Configure the ISDN interfaces on R1 and R4 as follows:

  • When R1's S0 goes down, R1 should place an outgoing call to R4.

  • R4 cannot call R1 under any circumstance.

  • Use PPP encapsulation and the strongest authentication available.

  • Never bring up more than one B channel to ensure that costs are kept to a minimum.

  • When the Frame Relay link is restored, bring down the ISDN link after 25 minutes.

  • When the ISDN is active, all routers must be able to ping and telnet the local ISDN interfaces on R1 and R4.

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