Flaws in CCNA 640-801 practice exam

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This test is very thorough and well-made, but I found some things that should be taken care of:

Question 59: (QID=1311)
After a failure of the serial link you discover that the ISDN backup link did not work.
What could be the cause of the problem? Click exhibit for ISDN topology, configurations and ISDN status.

Exhibit 1 R1 PPP Configuration
Exhibit 2 R2 PPP Configuration
Exhibit 3 ISDN Status
Click to view exhibit
1. The ISDN switch type is configured twice
2. There is no SPID configured
3. The hostname of one of the routers is configured incorrectly
4. The password is configured incorrectly on one of the routers
CorrectWrong!
Correct answer(s): 4
Explanation: In this setup, the ppp chap hostname alias-r1 command is configured on Router 1. Router 1 uses "alias-r1" as its hostname for CHAP authentication instead of "r1." The Router 2 dialer map name should match Router 1's ppp chap hostname; otherwise, two B channels are established, one for each direction. The problem is the password, Cisco passwords are case sensitive. © Cisco Inc.