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A)Describe different techniques that can be used to achieve scalability?
- “A distributed system is scalable
- when it improves is performance after adding resources”
- “Scalability is
- the ability of a system, network, or process, to handle growing amounts of work
- in a graceful manner or its ability to be enlarged to accommodate that growth”
- is very hard to achieve
- 1: Hiding Communication
- The difference between letting (a) a server or (b) a client check forms as they are being filled.
- 2: Distribution
- An example of dividing the DNS name space into zones.
B) Show how Rivest,Shamir, Adelson algorithm (RSA) works.
C) Describe and compare multithreaded server and single-threaded server implementations.
Single thread require time and memory to create the server.
When the time required to serve the request is less multithreaded servers are not convenient.
D) Assume a client calls an asynchronous RPC to a
server, and subsequently waits until the server returns a result using another
asynchronous RPC. Is this approach the same as letting the client execute a
normal RPC? .
- No, this is not the same. An asynchronous RPC returns an
- acknowledgment to the caller, meaning that after the first call by the client,
- an additional message is sent across the network. Likewise, the server is
- acknowledged that its
- response has been delivered to the client. Two
- asynchronous RPCs may be the
- same, provided reliable communication is guaranteed.
- This is generally not the
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