Computer Networking
OSI model means:

Operating source interconnection
Open source interconnection
Operating system interconnection
Open systems interconnection

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Computer Networking
Which of the following summation operations is performed on the bits to check an error-detecting code?

Coder-decoder
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions
Checksum
Codec
Attenuation

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Computer Networking
The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?

A physical address that is randomly assigned each time the computer is started
A physical address that is assigned by the manufacturer
A logical address that identifies the workstation
The logical domain address for the workstation
An alias for the computer name

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

The administrator is pinging from the interface.
The administrator has the interface shut down.
The keepalives are different times.
No cable is attached.

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