@Desmond Sindatry Thank you for reaching out.
Enterprise SKU does not support VNET injection. No need to worry about outbound network access requirements. For inbound access to the cache from the client application, you should allow traffic on ports 10000 and 8500 - 8599 if using OSS Cluster mode. If using Enterprise Cluster mode, only port 10000 is required.
https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-premium-vnet
https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/quickstart-create-redis-enterprise
https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-best-practices-enterprise-tiers
Hope that helps.
Please do not forget to mark as accept answer if that answers your query.
Regards,
Oury