You have been tasked with configuring a SOHO network in which all ports on the public untrusted network will be forwarded to one workstation connected to the LAN.

Which of the following features will you configure on the SOHO router to accomplish this task?

A. Port forwarding
B. MAC filtering
C. Demilitarized zone
D. Quality of service

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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