Computer Networking
The data-link layer, in reference to the OSI model, specifies

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

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

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