This assignment differs from past ones in that it isn't rooted in a research paper.
Whenever the IETF standardizes an Internet protocol, one requirement is that the corresponding RFC includes a Security Considerations section discussing different potential security issues that arise when using the protocol. RFC 3552 provides guidelines on how to write such a section.
Note: most of the RFC is a discussion of types of attacks rather than the particulars of writing security considerations. Accordingly, you might save yourself some time by reading sections 1-4 only lightly (or skipping them entirely and going straight to section 5), revisiting elements of them once you are focused on writing your own assessment.
For this assignment, choose any network protocol you're interested in (it doesn't have to be one that the IETF has standardized), other than (1) the examples from RFC 3552 (SMTP and VRRP), or (2) a security protocol. I recommend picking something simple. Feel free to pick an earlier version of the protocol, though if so, make clear which version you're assessing.
Your assessment here should be (reasonably) comprehensive. Note that security issues can often lurk in less-commonly-used functionality.