You and your network admin should follow the instructions described in these KB articles and not any others if you're unsure:
VMware KB: Host requirements for link aggregation for ESX and ESXi
For LACP deployments (only with 5.1 and dvSwitches):
You would need dot1q trunk mode if you're tagging multiple VLANs across the links (which is common for ESX(i) hosts with multiple networks on the same NICs).