How do you prepare for companies like Cisco if you are an embedded systems student at BITS?

Embedded interview are more like on concepts and programming.

Conceptually for networking companies like Cisco you can prepare on protocols tcp-Ip, UDP , client and server concepts, OSI model etc

And programming wise it will be more on embedded C prepare on pointers,bitwise twiddling ,data structures.

You may expect Linux or RTOS and controller Architectures related questions