Which of the following defines a rack located in an office building between the main rack and other office equipment?
A. DSU
B. MDF
C. CSU
D. IDF
Answer: D. IDF
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Provide an overview of the MPLS technology.
What will be an ideal response?
Answer the following:
(a) The equivalence
where a1 and a2 are disjoint subsets of a satisfying a = a1
U a2 holds under certain conditions on a1, a2, and c. State the conditions.
(b) Using the schema:
Sailors(sid: integer, sname: string, rating: integer, age: real)
key - sid
Boats(bid: integer, bname: string, color: string)
key - bid
Reserves(sid: integer, bid: integer, day: date)
key - sid, bid, day
(c) Consider the SELECT statement:
SELECT S.sname, S.rating
FROM Sailors S, Reserves R
WHERE S.sid = R.sid AND R.day = '5/11/98'
which uses the schema of (7b). Express it as an unoptimized relational algebra expression
using the operators natural join, select, and project.
(d) Give an equivalent relational algebra expression for the same query that can be evaluated
more eciently. Explain why you expect more ecient evaluation (no numbers).

Once a playlist is created, you do not need to add songs to the list.
Answer the following statement true (T) or false (F)
An organization has an internal PKI that utilizes client certificates on each workstation. When deploying a new wireless network, the security engineer has asked that the new network authenticate clients by utilizes the existing client certificates. Which of the following authentication mechanisms should be utilized to meet this goal?
A. EAP-FAST B. LEAP C. PEAP D. EAP-TLS