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A call-back system requires that a user with an id and
password call a remote server through a dial-up line, then
the server disconnects and:
A. dials back to the user machine based on the user id and
password using a telephone number from its database.
B. dials back to the user machine based on the user id and
password using a telephone number provided by the user
during this connection.
C. waits for a redial back from the user machine for
reconfirmation and then verifies the user id and password
using its database.
D. waits for a redial back from the user machine for
reconfirmation and then verifies the user id and password
using the sender's database.
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Answer: A
A call-back system in a net centric environment would mean
that a user with an id and password calls a remote server
through a dial-up line first, and then the server
disconnects and dials back to the user machine based on the
user id and password using a telephone number from its
database. Although the server can depend upon its own
database, it cannot know the authenticity of the dialer when
the user dials again. The server cannot depend upon the
sender's database to dial back as the same could be manipulated.
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