They ask everything about the layer 2 and layer 3 concepts. Be strong in switching concepts, BGP, NAT, VLAN, VTP, OSPF, MPLS, IPsec tunnels and subnetting. Also know your resume well as they will ask everything from it. They asked many questions about the area concept of ospf, NAT, VTP and VLAN. I was also given an IP address and was asked to find if it was a usable IP . You can crack the interview if you know your concepts well.
