Computer Networking
Baseband is

a signal all of whose energy is contained within a finite frequency range
None of these
the simultaneous transmission of data to a number of stations
All of these
transmission of signals without modulation

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

All of these
the virtual circuit interface to packet-switched service
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

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Computer Networking
Messages from one computer terminal can be sent to another by using data networks. The message to be sent is converted to an electronic digital signal, transmitted via a cable, telephone or satellite and then converted back again at the receiving end. What is this system of sending messages called?

None of these
Global network
Electronic newspaper
Electronic mail
Paperless office

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Computer Networking
If you wanted to deny FTP access from network 200.200.10.0 to network 200.199.11.0 but allow everything else, which of the following command strings is valid?

access-list 100 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftp
access-list 1 deny ftp 200.200.10.0 200.199.11.0 any any
access-list 198 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftpaccess-list 198 permit ip any 0.0.0.0 255.255.255.255
access-list 110 deny 200.200.10.0 to network 200.199.11.0 eq ftpaccess-list 111 permit ip any 0.0.0.0 255.255.255.255

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