Hello welcome to the world of networking.In case of CCNA we can do all most all labs in your home with the help of simulators.Both Packet Tracer and GNS3 is good in aspect of CCNA.But best is follow these steps..
a) For learners new to CCENT / CCNA - Packet Tracer's advantage is that it restricts the number of commands that can be viewed at any mode. Therefore, the student should feel less overwhelmed (or distracted) as he/she progresses through the CCENT / CCNA curriculum.
b) After the learner reaches a good confidence level and have done several labs using PT. Then, she/he can consider using GNS3 for a more realistic IOS feel. GNS3 runs the actual IOS so that the learner will be exposed the all the commands on the actual router.
c) Please note though that GNS3 requires much more hardware resources (CPU, RAM etc) to do the more complex labs. For example : A simple lab with 3 routers that are running OSPF may cause GNS3 to give "mixed results -- errors" if the hardware requirement (Processor and RAM) are not sufficient.
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