Cisco Career Track Advise

[Group Study]

Hello Friends...       I am planning to take reverse turn from routing & switching to wan switching, as i my work responsibilities are related more on wan technologies rather than routing or upper layers. I idea or suggestion would be appreciated.       I bought a book for CCNA WAN SW..looks great but bit upset as part II in it gives more hardware or installation details of IGX/BPX/MGX, I expect in exam there will no questions about fans & trays..   thanks rahul.