Computer Networking
A decrease in magnitude of current, voltage, a power of a signal in transmission between points, is known as

Carrier
Amplitude
Attenuation
Aloha
None of these

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Computer Networking
The packets switching concept was first proposed

All of these
in the late 1980s for the Defense Ministry of US.
in the early 1960s for military communication systems, mainly to handle speech
None of these
in the late 1950s for Defense Ministry of US

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Computer Networking
When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?

Only configured VLAN's are allowed on the link.
By default, all VLANs are allowed on the trunk.
No VLAN's are allowed, you must configure each VLAN by hand.
Only extended VLAN's are allowed by default.

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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."

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

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