Terminals A, B, and C are connected to a mainframe computer. Only terminal C has

Question

Terminals A, B, and C are connected to a mainframe computer. Only terminal C has data to transmit. Show the sequence of messages sent between the mainframe and the three terminals using roll call polling.

Using roll call polling:

Mainframe polls terminal A

A responds No.

Mainframe polls B

B responds No.

Mainframe polls C

C responds with data

Mainframe acknowledges data.

But if the distance between the terminals and mainframe is high then hub polling is used.

Using Hub polling :

Mainframe polls A

A passes poll onto B

B passes poll onto C

C responds with data

Mainframe acknowledges data.

Provide technically feasible solution? Financially feasible? Politically feasible? Defend your position.

Explanation / Answer

Terminals A, B, and C are connected to a mainframe computer.

Using roll call polling:

Mainframe polls terminal A

A response No.

Mainframe polls B

B responds No.

Mainframe polls C

C responds with data

Mainframe acknowledges data.

But if the distance between the terminals and mainframe is high then hub polling is used.

Using Hub polling :

Mainframe polls A

A passes poll onto B

B passes poll onto C

C responds with data

Mainframe acknowledges data.

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