Pawan, the L1/L2 ports are not in use on the Nexus 5ks. Those ports are only used on the UCS 6120 Fabric Interconnects for clustering of two 6120s. The 6120 and Nexus 5010s use the same hardware so that is why those ports are on the 5k. The mgmt 1 port is not used either, not sure what Cisco has planned for it but right now there isn't a way to make use of it.