Computer Networking
The physical layer, in reference to the OSI model, defines

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

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Computer Networking
RS-449/442-A/423-A is

None of these
the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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Computer Networking
You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?

Broadcast storms will occur on the switched network.
The switches will automatically load-balance between the two links.
The MAC forward/filter table will not update on the switch.
The routing tables on the switches will not update.

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Computer Networking
What is a stub network?

A network with more than one exit point.
A network that has only one entry and exit point.
A network with more than one exit and entry point.
A network with only one entry and no exit point.

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