Computer Networking
The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is

6200 bps
31000 bps
9600 bps
None of these
34000 bps

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Computer Networking
In Cisco's Unified Wireless Solution, what is the split-MAC architecture?

The split-MAC architecture uses MAC addresses on the wireless network and IP addresses on the wired network.
The split-MAC architecture uses MAC addresses to create a forward/filter table and break up collision domains.
The split-MAC architecture allows the splitting of 802.11 protocol packets between the AP and the controller to allow processing by both devices.
The split-MAC architecture uses MAC addresses to create a forward/filter table and break up broadcast domains.

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Computer Networking
The packets switching concept was first proposed

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

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