solve these asap

2) (2 points) In addition to Data Link error control (on a link-by-link basis), error control is also required at the Transport layer (end-to-end) because a. We don't trust the Data link c. One can never be too sure layer mechanisms d. The data flow observed at b. We must cover buffer end-to-end is always read/write errors within different than the one nodes observed on a link-by-link 3) (2 points) As examined in class, multiplexing can be performed in the following domains (could be many) a. Time e. Wavelength b. Space f. Behavior c. Frequency d. Phase h. Amplitude g. Code