Computer Networking
Which of the following is true when describing a multicast address?

Packets are delivered to all interfaces identified by the address. This is also called a one-to-many address.
Packets addressed to a unicast address are delivered to a single interface.
Identifies multiple interfaces and is only delivered to one address. This address can also be called one-to-one-of-many.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.

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Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
None of these
network access standard for connecting stations to a circuit-switched network
a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media

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Computer Networking
The network layer, in reference to the OSI model, provide

the interface between the X.25 network and packet mode device
None of these
All of these
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received

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