Service providers and large enterprises can use features such as MPLS 元VPNs to tunnel traffic from one site to another forwarding the traffic over the providers core IPv4 network using label switching. The same concepts apply to other vendors (and their certifications) that include MPLS such as Juniper and HP. Cisco Service Provider related CCNA CCNP and CCIE certifications. Live gear with an IOS image supporting MPLS could be used instead of the GNS3 emulation GNS3 and a Cisco IOS image (12.x or 15.x) which includes the MPLS feature set
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