Version 4.1 - 3.7 TFTP
TFTP is a dirty little protocol. If you remember that, you're probably going to remember all you need to know about it. It is "dirty" because it is so totally unsecured (and runs over UDP 69). It does not send passwords in the clear - because it doesn't use usernames and passwords at all! If you think about what it was created to do, it all makes sense.
This protocol was created when you had workstations booting from the network and pulling down their config (or operating system). There are two uses that are important related to Cisco devices. The first use is for transferring files to/from Cisco devices. So you'll see this a lot in device management. The other place you'll see tftp is with Voice devices. IP Phones are going to pull down a device config over tftp. So as much as you wish it would disappear, tftp is going to be needed at various times and on various points of your network.
They may not ask you any direct questions on TFTP, but may ask something about how you would "secure" it. You want to only allow tftp between devices that need to use it. [There is no reason to allow tftp from the outside into your internal network.] There is a Cisco doc that covers TFTP with regards to CUCM.
Basically, anyone who has performed device upgrades and recovered from ROMMON by downloading an image file (tftpdnld), has probably enough experience to get through anything tftp related on this exam.