We continue our discussion on the Riverbed Optimization System. We noted that its a powerful WAN accelerator. We review some of the technical concepts. The Riverbed Optimization System (RiOS) operates as a transparent TCP Proxy. RiOS implements the logical single end to end TCP connection with three back to back TCP connections. These connections are established in a one-to-one ratio with no encapsulation, traffic mixing, or tunnel configuration. The two outer connections look the same as a simple logical end to end connection to both the client and the server while the inner connection is invisible. This inner connection lets RiOS perform a variety of performance improvements for transmissions across the WAN. Due to this design of TCP connections across WAN, there is no disruption or reconfiguration of clients, servers or routers. For each of the software clients across the branch office computers, RiOS replace the original end to end TCP connections with two or three back to back connections. The server side connections appear the same as its original connections while the RiOS optimized connection accelerates WAN traffic directly over the remote compute device.
By referring to the proxy as transparent, it is implied that the source and the destination IP header information is maintained as the optimized traffic flows through the device. In the event that this may not jive with the various network rules and firewalls, RiOS provides three visibility modes: Correct Addressing, Correct Addressing Plus Port Transparency and Full IP address and Port Transparency.
Correct Addressing refers to a mode in which the RiOS addresses optimized traffic across the WAN to accurately reflect the source, destination, and nature of each packet. The IP addresses are meaningful only to those appliances while that of the unoptimized traffic is relevant only to LAN.
Correct Addressing plus Port Transparency introduces "spoofing" for the traffic sent over the WAN. The WAN traffic is still addressed to and from the appliance's IP addresses - only the port information is spoofed.
With Full IP address and Port Transparency, RiOS offers a complete address spoofing operations. Here the optimized traffic is addressed identically to unoptimized traffic on the LAN.

#codingexercise




Double  GetNthRootProductOddRaisedPPlusQAndEvenRaisedPMinusQ (Double [] A,Double  p, Double q)



{



If ( A== null) return 0;

By


Return A.NthRootProductOddRaisedPPlusQAndEvenRaisedPMinusQ(p, q);



}

In light of the coding exercises, perhaps I want to draw attention to an actual interview question.
This interview question made you think if you wanted a different data structure.
Entries are placed in a singly linked list that may have duplicates but can also be compared. We want the most efficient algorithm to sort them descending.