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Q2. Which protocol does SNMP use for transport?
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A. TCP over IP B. UDP over IP C. FTP over IP D. ICMP
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Correct answer: B
Explanation:
The Simple Network Management Protocol (SNMP) is essentially a request-reply protocol running over UDP (ports 161 and 162). SNMP runs between a management station (smart) and an agent (dumb).
Version 1 SNMP supports five possible PDUs:
GetRequest / SetRequest supplies a list of objects and, possibly, values they
are to be set to (SetRequest). In either case, the agent returns a GetResponse.
GetResponse informs the management station of the results of a GetRequest or SetRequest by returning an error indication and a list of variable/value bindings.
GetNextRequest is used to perform table transversal, and in other cases where the management station does not know the exact MIB name of the object it desires.
Trap is the only PDU sent by an agent on its own initiative. It is used to notify the management station of an unusual event that may demand further attention (like a link going down). In version 2, traps are named in MIB space.
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