The lower layer protocols, such as the MAC and the physical ...

[@Brianna17]

The lower layer protocols, such as the MAC and the physical layer, do not have to build specific interfaces to the higher layer protocols, such as layer 3, in order to communicate.
 
  Indicate whether the statement is true or false

Question 2

Why has ISDN received a lukewarm welcome in the United States?
 
  A) costs of end equipment and upgrades
  B) too few technicians have studied it sufficiently to establish familiarity
  C) equipment failures
  D) too complicated
  E) all of the above are factors

[Gabe]

Answer to Question 1

TRUE

Answer to Question 2

A

[@Brianna17]

TYSM

[samiel-sayed]

Thanks for the timely response, appreciate it