The data-link layer, in reference to the OSI model, specifies
Options: data link procedures that provide for the exchange of data via frames that can be sent and received, the interface between the X.25 network and packet mode device, the virtual circuit interface to packet-switched service, All of the above
When referring to instruction words, a mnemonic is:
Options: a short abbreviation for the operand address, a short abbreviation for the operation to be performed, a short abbreviation for the data word stored at the operand address, shorthand for machine language
A supertype/subtype hierarchy has which of the following features?
Options: Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype., Attributes are assigned at the highest logical level., Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype., Attributes are assigned at the lowest logical level.