Computer Networking
You are unsuccessful in telnetting into a remote device. What could the problem be?1. IP addresses are incorrect.2. Access control list is filtering Telnet.3. There is a defective serial cable.4. The VTY password is missing.

All of these
2 and 4 only
3 only
1 only

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

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

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