Hello,
After doing a silent install of remote agent you will not have to reboot the server even if it prompts you can choose to reboot the server later, but it is recommended that you reboot the server once after the installation of remote agent.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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Thanks,