Computer Networking
Which of the following modes are valid when a switch port is used as a VLAN trunk?1. Blocking2. Dynamic auto3. Dynamic desirable4. Nonegotiate5. Access6. Learning

4, 5 and 6
1, 2 and 6
2, 3 and 4
2, 4, and 5

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Computer Networking
X.21 is

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

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