This chapter concludes the in-depth look at routing TCP/IP with exterior routing protocols and other techniques used in interdomain routing. You should know this material thoroughly before taking the CCIE exam. Routing TCP/IP is not the only topic covered on the exam, however. You need to study other protocols, such as SNA, IPX, and AppleTalk. If you have not already done so, you also need to study LAN and WAN switching.