Computer Networking
In a PC to telephone hookup for long distance communication, modem is connected between the telephone line and

PC
None of these
synchronous port
asynchronous port
crossover cable

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Computer Networking
X.21 is

None of these
a very common bit-oriented data link protocol issued by ISO
a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media
network access standard for connecting stations to a circuit-switched network

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Computer Networking
You want to create a standard access list that denies the subnet of the following host: 172.16.144.17/21. Which of the following would you start your list with?

access-list 10 deny 172.16.136.0 0.0.15.255
access-list 10 deny 172.16.64.0 0.0.31.255
access-list 10 deny 172.16.48.0 255.255.240.0
access-list 10 deny 172.16.144.0 0.0.7.255

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