1) what are the two main functions of a datagram-based network layer? what additional functions does a vc-based network layer have? 2) list and describe the atm network service models. 3) compare and contrast link-state and distance-vector routing algorithms. 4) discuss how a hierarchical organization of the internet has to scale to millions of users. 5) it is necessary that every autonomous system use the same intra-autonomous routing algorithm? why or why not?

Fast answer i need for apex ! smartphones should be banned from the classroom in public schools so that students cannot cheat on test so easily? which is an example of a counter argument to the thesis above? a.the classroom is a place for learning not for making phone calls b. smartphones are useful learning tools in the modern classroom c.banning smartphones will not students pay attention to teachers any better d. banning smartphones would decreased incidents of theft