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ACM Transactions on Computer Systems (TOCS)
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Journal of the ACM (JACM)
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Journal of the ACM (JACM)
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ACM Transactions on Computer Systems (TOCS)
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Communications of the ACM
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IEEE Internet Computing
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In this paper, we propose a strategy to improve scalability of replicated services in mobile agent systems by using an appropriate passive replication protocol for each replicated service according to whether the service is deterministic or non-deterministic. For this purpose, two passive replication protocols are introduced for nondeterministic and deterministic services respectively. They both allow visiting mobile agents to be forwarded to and execute their tasks on any node performing a service agent, not necessarily the primary agent. Additionally, in the second protocol for deterministic services, after a backup service agent has received each mobile agent request and obtained its delivery sequence number from the primary service agent, the backup is responsible for processing the request and coordinating with the other replica service agents. Therefore, our strategy using the two proposed protocols can promise better scalability of replicated services a large number of mobile agents attempt to access in mobile agent systems.