Computer Networking
RS-449/442-A/423-A is

a set of physical layer standards developed by EIA and intended to replace RS-232-
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
the ratio of the number of data units in error to the total number of data units
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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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 172.16.136.0 0.0.15.255
access-list 10 deny 172.16.64.0 0.0.31.255

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