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For CCNP or CCIE, Packet Tracer is useless. You need CML (Cisco Modeling Labs) or real gear.

After logging in:

If you try to open Packet Tracer and get a message saying it "cannot be opened because it is from an unidentified developer," follow these steps:

Build your first VLAN, configure OSPF, or simulate a WAN failure. The only limit is your curiosity.