Computer Networking
Which statement describes a spanning-tree network that has converged?

All switch and bridge ports are either blocking or looping.
All switch and bridge ports are assigned as either root or designated ports.
All switch and bridge ports are in either the forwarding or blocking state.
All switch and bridge ports are in the forwarding state.

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Computer Networking
X.21 is

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

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Computer Networking
The main difference between TCP and UDP is

TCP is an Internet protocol where as UDP is an ATM protocol
All of these
UDP is connection oriented where as TCP is datagram service
None of these
UDP is a datagram where as TCP is a connection oriented service

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