Cisco Cisco Email Security Appliance X1050 Guida Utente

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Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
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Appendix B      Assigning Network and IP Addresses
The number of Cisco IronPort appliance interfaces that you choose to connect and how you address them 
should be dictated by the complexity of your underlying network. It is not necessary to connect multiple 
interfaces if your network topology or data volumes do not call for it. It is also possible to keep the 
connection simple at first as you familiarize yourself with the gateway and then increase the connectivity 
as volume and network topology require it.