would invoke an ordinary local method Other RPC like techniques besides RPC and

Would invoke an ordinary local method other rpc like

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would invoke an ordinary local method Other RPC-like techniques (besides RPC and RMI) CORBA (Common Object Request Broker Architecture) DCOM (Distributed COM) 1 The University of Sydney Page 11 TCP/IP Intermediate nodes have no knowledge of TCP connections The IP packets that transfer the data in a TCP transmission do not necessarily take all the same physical routes 1 Distinct routes per TCP connection Socket (161.25.19.8:80) Socket (146.86.5.20:1625) 2 3 5 4 1 The University of Sydney Page 12 TCP/IP If segments get re-ordered during the transmission 1 TCP guarantees ordered delivery Socket (161.25.19.8:80) Socket (146.86.5.20:1625) 2 3 5 4 1
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6/5/18 4 The University of Sydney Page 13 TCP/IP If segments get re-ordered during the transmission The receiver exploits the sequence numbers to reorder segments before delivery at its higher layers 1 TCP guarantees ordered delivery (con’t) Socket (161.25.19.8:80) Socket (146.86.5.20:1625) 2 3 5 4 1 The University of Sydney Page 14 TCP/IP The sender takes care not to overwhelm the receiver Whenever the receiver receives a segment it records its number The receiver sends acknowledgments to the sender with the highest number seen and a window size, indicating the amount of data the sender can send before waiting for the next acknowledgment 1 TCP controls the flow Socket (161.25.19.8:80) Socket (146.86.5.20:1625) 2 3 5 1 ack(4, s) 4 The University of Sydney Page 15 TCP/IP The sender records the sequence numbers of the segments it has sent Upon reception of an acknowledgment it notes the successful receipts and deletes the appropriate numbers If any segment is not acknowledged within a timeout, then the sender retransmits it 1 TCP ensures retransmission Socket (161.25.19.8:80) Socket (146.86.5.20:1625) 2 3 5 4 1 1,2,3,4 received Routing
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6/5/18 5 The University of Sydney Page 17 Distance-vector routing algorithm Let’s run the algorithm on the network below : initially, all routing tables are empty 1 RIP Routing table of router A Dest. Dir Cost A local 0 A D B E C 1 6 3 4 2 5 Routing table of router B Dest. Dir Cost B local 0 Routing table of router C Dest. Dir Cost C local 0 Routing table of router D Dest. Dir Cost D local 0 Routing table of router E Dest. Dir Cost E local 0 The University of Sydney Page 18 Distance-vector routing algorithm Example : How is routing table A built from scratch? 1 RIP (con’t) Routing table of router A Dest. Dir Cost A local 0 B 1 1 D 3 1 A D B E C 1 6 3 4 2 5 T E T E T C T C T D T B The University of Sydney Page 19 Distance-vector routing algorithm Example : How is routing table A built from scratch? 1 RIP (con’t) Routing table of router A Dest. Dir Cost A local 0 B 1 1 C 1 2 D 3 1 E 1 2 A D B E C 1 6 3 4 2 5 T D T B T E T E The University of Sydney Page 20 Distance-vector routing algorithm Example : How is routing table A built from scratch? 2 RIP (con’t) Routing table of router A Dest. Dir Cost A local 0 B 1 1 C 1 2 D 3 1 E 1 2 A D B E C 1 6 3 4 2 5 T D ’’ T B ’’
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6/5/18 6 File System The University of Sydney Page 22 Time The make command automate the compilation of multiple files It examines the time at which all sources and object files were last modified
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  • routing protocol, Consistency model

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