You can find the material posted on the lab pages.
Most important, L4 packet rewrites: lab 8 (life-in-packet-l4) at https://cmpe080n-spring16-01.courses.soe.ucsc.edu/system/files/secure-attachments/life-in-packet-l4.pdf
Next: L2/l3/l4 formats (lab 5) valid l2-l4 formats at https://cmpe080n-spring16-01.courses.soe.ucsc.edu/system/files/secure-attachments/valid%20l2-4%20formats.pdf
L2/l3/l4 recognize the CORRECT format for each, and which is the source or destination in a packet.
Also, recognize and identify which ports go with which services (e.g. web service or http). Material from last week.
Technically, any and all prior material can be covered.
But i'd concentrate on the above.
All of the above was also discussed and covered in class (specifically tuesday, with details happening after 5pm on tuesday).