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DV and LS Routing Algorithm Implementation in ns2

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#Create a simulator object set ns [new Simulator] #Tell the simulator to use dynamic routing $ns rtproto DV/LS #Open the nam trace file set nf [open out.nam w] $ns namtrace-all $nf #Define a 'finish' procedure proc finish {} {         global ns nf         $ns flush-trace #Close the trace file         close $nf #Execute nam on the trace file         exec nam out.nam &         exit 0 } #Create seven nodes for {set i 0} {$i < 7} {incr i} {         set n($i) [$ns node] } #Create links between the nodes for {set i 0} {$i < 7} {incr i} {         $ns duplex-link $n($i) $n([expr ($i+1)%7]) 1Mb 10ms DropTail } #Create a UDP agent and attach it to node n(0) set udp0 [new Agent/UDP] $ns attach-agent $n(0) $udp0 # Create a CBR traffic source and attach it to udp0 set cbr0 [new Application/Traffic/CBR] $cbr0 se...
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Data Communication Basics

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DATA COMMUNICATIONS : When we communicate, we are sharing information. This sharing can be local or remote. Between individuals, local communication usually occurs face to face, while remote communication takes place over distance. The term telecommunication, which includes telephony, telegraphy, and television, means communication at a distance (tele is Greek for "far"). The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable. For data communications to occur, the communicating devices must be part of a communication system made up of a combination of hardware (physical equipment) and software (programs). The effectiveness of a data communications system depends on four fundamental characteristics: delivery, accuracy, timeliness, and jitter. I. Delivery. The system must deliver data to t...
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Implementation of 2PL Protocol in java

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Implementation of 2PL Protocol in java. import java.io.*; import java.util.*; class Account {     String name;     int amount,lock;         Account(String name,int amount,int lock)     {     this.name=name;     this.amount=amount;     this.lock=lock;     }         public void deposit(int amt)     {         amount +=amt;     }         public void withdraw(int amt)     {         if((amount-amt)<0)         {             System.out.println("Transaction Cannot proceed : Not Enough Balance in Account"+name);             System.exit(0);         ...
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