For some Algorithms and systems that just mentioned briefly, are we expected to remember the detail of them? For example: ODL controller, ONOS controller, MD5, SHA-1, DES, AES.
You just need to remember them briefly!
What I mean is that you need to remember the whole idea of them if we skipped them quickly. For example, for MD5, you should remember that it is a hash function. We do not expect you to remember who many bits the hash is (because that specific number has no real meaning and learning value).
For ODL controllers, the main point that you should remember is the three layers in it and what is their main task. However, you do not need to remember to specific components of ONOS or ODL.