Packet transmission with network topologies

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Default-person Gagana B (Author)

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networks 

Tagged by Gagana B over 7 years ago

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WHAT IS IT?

Network is an ordered interconnection of autonomous computers that allows the computers to exchange data. Topology of the network or Network topology is the arrangement of links, nodes and other components of a network that may be depicted physically or logically. This model attempts to model network topologies like star, bus, tree, mesh and ring and also the local area network, metropolitan area network and wide area network architectures and how packet transmission occurs in each of them.

HOW IT WORKS

Star configuration: The turtles move forward at an angle of 45 degrees to each other, and leave a trail as they do so. A star network consists of one central switch, hub or computer, which act as a conduit to transmit messages. This consists of a central node, to which all other nodes are connected; this central node provides a common connection point for all nodes through a hub. Advantages of this network include - better performance, easy detection of faults, and no distruptions while connecting or removing devices. Disadvantages of the configuration includes - limited capacity of nodes, expenses.

Ring configuration: With n turtles which move 72 degrees with respect to each other, only n-1 turtles move to the each time to represent the next node. A ring network is a network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring. Data travel from node to node, with each node along the way handling every packet. Advantages of the network include ease of isolation of faults and ease of adding and removing devices due to point line configuration. The disadvantages are - communication delay since bandwidth is shared among all links and difficulty in configuration.

Bus configuration: All turtles are assembled on to a straight line and alternatively made to move upwards and downwards to represent a linear sequence of buses. The bus is the data link in a bus network. The bus can only transmit data in one direction, and if any network segment is severed, all network transmission ceases.The advantages of this type of network includes - ease of connection, lesser length of cable required and the disadvantages include - requirement of terminators on both ends, difficulty in debugging, and makes the configuration slow.

Tree configration: The turtles split up into 3 parts and split up again into a pattern to represent the tree topology.Tree Topology integrates the characteristics of Star and Bus Topology. In Tree Topology, the number of Star networks are connected using Bus. This main cable seems like a main stem of a tree, and other star networks as the branches. It is also called Expanded Star Topology. The advantages are - ease in error detection, easy expansion and disadvantages are - maintainance and scalability.

Mesh configuration: The turtles are assembled onto a grid or matrix format where each node is connected to adjacent nodes. A mesh network is a network topology in which each node (called a mesh node) relays data for the network. All nodes cooperate in the distribution of data in the network. The advatages include - ability to withstand high traffic, ability to expand and modify without disrupting other nodes. The disadvantages of the topology are - difficulty in maintainance and reducdancy issues.

Fully connected configuration - The turtles are assembled onto a network such that every node is connected to every other node. The advatages include - ability to connect directly with any other node. The disadvantages of the topology are - it doesn't scale well.

Local Area Network - A local area network is a computer network that interconnects computers within a limited area such as a home, school, computer laboratory, or office building, using network media.

Metropolitan Area Network - A metropolitan area network (MAN) is computer network larger than a local area network, covering an area of a few city blocks to the area of an entire city, possibly also including the surrounding areas.

Wide Area Network - A wide area network (WAN) is a network that covers a broad area (i.e., any telecommunications network that links across metropolitan, regional, national or international boundaries) using leased telecommunication lines.

THINGS TO NOTICE

When the star topology button is clicked, the setup procedures run creating 10 turtles arranging themselves to form a star network after setting their headings and moving accordingly and packet transmission occurs thereafter.

When the ring topology button is clicked, the go procedures execute creating 6 turtles arranging themselves in form of a ring network after setting their headings and moving accordingly and packet transmission occurs thereafter.

When the bus topology button is clicked, the bus procedures execute creating 10 turtles arranging themselves in form of a straight line where the turtles are made to move upwards and downwards to simulate the configuration and packet transmission occurs thereafter.

When the tree topology button is clicked, the tree procedures execute creating 12 turtles arranging themselves to split up in to 3 branches in the first step and unevenly thereon in order to simulate the configuration and packet transmission occurs thereafter.

When the mesh topology button is clicked, the mesh procedures are executed, creating 10 turtles arranging themselves in form of a grid or a 3X3 matrix to simulate the configuration and packet transmission occurs thereafter..

THINGS TO TRY

I suggest users and netlogo enthusiasts to try out other network topologies if any, and try the same above topologies to represent the same in different ways and orientations. Also try packet transmissions for different nodes and you may also randomise them.

NETLOGO FEATURES

Simple concepts of netlogo like creating turtles, changing shapes and colours and leaving a trail etc. are extensively used.

RELATED MODELS

See other models in the sample tab under Networks category.

CREDITS AND REFERENCES

The model itself and for the NetLogo software: Wilensky, U. (2005). NetLogo Small Worlds model. http://ccl.northwestern.edu/netlogo/models/SmallWorlds. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL. Wilensky, U. (1999). NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.

Comments and Questions

Please start the discussion about this model! (You'll first need to log in.)

Click to Run Model

;Project by Gagana B

to setup
  ;;
  ;;driver function to setup the world
  ;;
   clear-all
end 

to lan
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Local Area Network Architecture ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  
  set-default-shape turtles "circle" ;Setting default shape of turtle to circle
  create-turtles 8                   ;Creating 8 turtles
  ask turtles[set color gray]        ;Setting color of turtles to gray
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 7[set heading 0]
  ask turtle 0[set heading 0]
  ask turtle 1[set heading 45]
  ask turtle 2[set heading 90]
  ask turtle 3[set heading 135]
  ask turtle 4[set heading 180]
  ask turtle 5[set heading 225]
  ask turtle 6[set heading 270]
  ;making the turtles leave a trail
  ask turtles [set pen-mode "down"]
  ;defining the movement of turtles to form a lan network 
  ask turtle 1[forward 15]
  ask turtle 2[forward 15]
  ask turtle 3[forward 15]
  ask turtle 4[forward 15]
  ask turtle 5[forward 15]
  ask turtle 6[forward 15]
end 

to wan
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Wide Area Network Architecture ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  
  set-default-shape turtles "circle" ;Setting default shape of turtle to circle
   create-turtles 36                 ;Creating 36 turtles
  ask turtles[set color cyan]        ;Setting color of turtles to cyan
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 7[set heading 0]
  ask turtle 0[set heading 0]
  ask turtle 1[set heading 45]
  ask turtle 2[set heading 90]
  ask turtle 3[set heading 135]
  ask turtle 4[set heading 180]
  ask turtle 5[set heading 225]
  ask turtle 6[set heading 270]
  ask turtle 8[set heading 325]
  ask turtle 9[set heading 325]
  ask turtle 10[set heading 325]
  ask turtle 11[set heading 325]
  ask turtle 12[set heading 325]
  ask turtle 13[set heading 325]
  ask turtle 14[set heading 325]
  ask turtle 15[set heading 325]
  ask turtle 16[set heading 205]
  ask turtle 17[set heading 205]
  ask turtle 18[set heading 205]
  ask turtle 19[set heading 205]
  ask turtle 20[set heading 205]
  ask turtle 21[set heading 205]
  ask turtle 22[set heading 205]
  ask turtle 23[set heading 205]
  ask turtle 24[set heading 60]
  ask turtle 25[set heading 60]
  ask turtle 26[set heading 60]
  ask turtle 27[set heading 60]
  ask turtle 28[set heading 60]
  ask turtle 29[set heading 60]
  ask turtle 30[set heading 150]
  ask turtle 31[set heading 150]
  ask turtle 32[set heading 150]
  ask turtle 33[set heading 150]
  ask turtle 34[set heading 150]
  ask turtle 35[set heading 150]
  ;making the turtles leave a trail
  ask turtles [set pen-mode "down"]
  ;defining the movement of turtles
  ;;
  ;;Setting up and connecting many lAN's and Wan's to make a WAN
  ;;
  ask turtle 1[forward 5]
  ask turtle 2[forward 5]
  ask turtle 3[forward 5]
  ask turtle 4[forward 5]
  ask turtle 5[forward 5]
  ask turtle 6[forward 5]
  ask turtle 8[forward 14]
  ask turtle 9[forward 14]
  ask turtle 10[forward 14]
  ask turtle 11[forward 14]
  ask turtle 12[forward 14]
  ask turtle 13[forward 14]
  ask turtle 14[forward 14]
  ask turtle 15[forward 14]
  ask turtle 16[forward 12]
  ask turtle 17[forward 12]
  ask turtle 19[forward 12]
  ask turtle 18[forward 12]
  ask turtle 20[forward 12]
  ask turtle 21[forward 12]
  ask turtle 22[forward 12]
  ask turtle 23[forward 12]
  ask turtle 24[forward 10]
  ask turtle 25[forward 10]
  ask turtle 26[forward 10]
  ask turtle 27[forward 10]
  ask turtle 28[forward 10]
  ask turtle 29[forward 10]
  ask turtle 30[forward 10]
  ask turtle 31[forward 10]
  ask turtle 32[forward 10]
  ask turtle 33[forward 10]
  ask turtle 34[forward 10]
  ;;
  ;;setting heading of turtles
  ;;
  ask turtle 8[set heading 0]
  ask turtle 9[set heading 45]
  ask turtle 10[set heading 90]
  ask turtle 11[set heading 135]
  ask turtle 12[set heading 180]
  ask turtle 13[set heading 225]
  ask turtle 14[set heading 270]
  ask turtle 15[set heading 325]
  ;;making the turtles leave a trail as they move
  ask turtles [set pen-mode "down"]
  ;;defining movement of turtles
  ask turtle 9[forward 5]
  ask turtle 10[forward 5]
  ask turtle 11[forward 5]
  ask turtle 12[forward 5]
  ask turtle 13[forward 5]
  ask turtle 14[forward 5]
  ask turtle 15[forward 5]
  ;;
  ;;setting heading of turtles
  ;;
  ask turtle 16[set heading 0]
  ask turtle 17[set heading 45]
  ask turtle 18[set heading 90]
  ask turtle 19[set heading 135]
  ask turtle 20[set heading 180]
  ask turtle 21[set heading 225]
  ask turtle 22[set heading 270]
  ask turtle 23[set heading 325]
  ask turtle 23[set heading 0]
  ;;defining movement of turtles
  ask turtle 23[forward 5]
  ask turtle 17[forward 5]
  ask turtle 18[forward 5]
  ask turtle 19[forward 5]
  ask turtle 20[forward 5]
  ask turtle 21[forward 5]
  ask turtle 22[forward 5]
  ;;
  ;;setting heading of turtles
  ;;
  ask turtle 24[set heading 0]
  ask turtle 25[set heading 45]
  ask turtle 26[set heading 90]
  ask turtle 27[set heading 135]
  ask turtle 28[set heading 180]
  ask turtle 29[set heading 225]
  ;;defining movement of turtles
  ask turtle 25[forward 3]
  ask turtle 26[forward 3]
  ask turtle 27[forward 3]
  ask turtle 28[forward 3]
  ask turtle 29[forward 3]
  ;;
  ;;setting heading of turtles
  ;;
  ask turtle 30[set heading 0]
  ask turtle 31[set heading 90]
  ask turtle 32[set heading 135]
  ask turtle 33[set heading 180]
  ask turtle 34[set heading 225]
  ask turtle 35[set heading 270]
  ;;defining movement of turtles
  ask turtle 30[forward 3]
  ask turtle 31[forward 3]
  ask turtle 32[forward 3]
  ask turtle 33[forward 3]
  ask turtle 34[forward 3]
  ask turtle 35[forward 3]
end 

to man
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Metropolitan Area Network Architecture ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  
  set-default-shape turtles "circle" ;Setting default shape of turtle to circle
  create-turtles 24                   ;Creating 24 turtles
  ask turtles[set color magenta]        ;Setting color of turtles to magenta
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 7[set heading 0]
  ask turtle 0[set heading 0]
  ask turtle 1[set heading 45]
  ask turtle 2[set heading 90]
  ask turtle 3[set heading 135]
  ask turtle 4[set heading 180]
  ask turtle 5[set heading 225]
  ask turtle 6[set heading 270]
  ask turtle 8[set heading 325]
  ask turtle 9[set heading 325]
  ask turtle 10[set heading 325]
  ask turtle 11[set heading 325]
  ask turtle 12[set heading 325]
  ask turtle 13[set heading 325]
  ask turtle 14[set heading 325]
  ask turtle 15[set heading 325]
  ask turtle 16[set heading 205]
  ask turtle 17[set heading 205]
  ask turtle 18[set heading 205]
  ask turtle 19[set heading 205]
  ask turtle 20[set heading 205]
  ask turtle 21[set heading 205]
  ask turtle 22[set heading 205]
  ask turtle 23[set heading 205]
  ;making the turtles leave a trail
  ask turtles [set pen-mode "down"]
  ;defining the movement of turtles
  ;;
  ;;Setting up and connecting many LAN's to make a MAN
  ;;
  ask turtle 1[forward 5]
  ask turtle 2[forward 5]
  ask turtle 3[forward 5]
  ask turtle 4[forward 5]
  ask turtle 5[forward 5]
  ask turtle 6[forward 5]
  ask turtle 8[forward 14]
  ask turtle 9[forward 14]
  ask turtle 10[forward 14]
  ask turtle 11[forward 14]
  ask turtle 12[forward 14]
  ask turtle 13[forward 14]
  ask turtle 14[forward 14]
  ask turtle 15[forward 14]
  ask turtle 16[forward 12]
  ask turtle 17[forward 12]
  ask turtle 19[forward 12]
  ask turtle 18[forward 12]
  ask turtle 20[forward 12]
  ask turtle 21[forward 12]
  ask turtle 22[forward 12]
  ask turtle 23[forward 12]
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 8[set heading 0]
  ask turtle 9[set heading 45]
  ask turtle 10[set heading 90]
  ask turtle 11[set heading 135]
  ask turtle 12[set heading 180]
  ask turtle 13[set heading 225]
  ask turtle 14[set heading 270]
  ask turtle 15[set heading 325]
  ;;tracking the movement of turtles
  ask turtles [set pen-mode "down"]
  ;;defining movement of turtles
  ask turtle 9[forward 5]
  ask turtle 10[forward 5]
  ask turtle 11[forward 5]
  ask turtle 12[forward 5]
  ask turtle 13[forward 5]
  ask turtle 14[forward 5]
  ask turtle 15[forward 5]
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 16[set heading 0]
  ask turtle 17[set heading 45]
  ask turtle 18[set heading 90]
  ask turtle 19[set heading 135]
  ask turtle 20[set heading 180]
  ask turtle 21[set heading 225]
  ask turtle 22[set heading 270]
  ask turtle 23[set heading 325]
  ask turtle 23[set heading 0]
  ;;defining movement of turtles
  ask turtle 23[forward 5]
  ask turtle 17[forward 5]
  ask turtle 18[forward 5]
  ask turtle 19[forward 5]
  ask turtle 20[forward 5]
  ask turtle 21[forward 5]
  ask turtle 22[forward 5]
end 

to line
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Line Configuration ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;
  
  set-default-shape turtles "circle" ;Setting default shape of turtle to circle
  create-turtles 10                   ;Creating 10 turtles
  ask turtles[set color violet]      ;Setting color of turtles to violet
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 0[set heading 90]
  ask turtle 1[set heading 90]
  ask turtle 2[set heading 90]
  ask turtle 3[set heading 90]
  ask turtle 4[set heading 90]
  ask turtle 5[set heading 270]
  ask turtle 6[set heading 270]  
  ask turtle 7[set heading 270]
  ask turtle 8[set heading 270]
  ;making the turtles leave a trail
  ask turtles [set pen-mode "down"]
  ;defining the movement of turtles
  ask turtle 1[forward 2]
  ask turtle 2[forward 4]
  ask turtle 3[forward 6]
  ask turtle 4[forward 8]
  ask turtle 5[forward 2]
  ask turtle 6[forward 4]
  ask turtle 7[forward 6]
  ask turtle 8[forward 8]
  loop
  [ packetline ;;calling function packetline
    stop
  ]
end 

;;function packetline

to packetline
  ;;
  ;;packet transmission in line configuration
  ;;
  ask turtle 9[set pen-mode "up"]
  ask turtle 9[set color blue] ;;setting color of packet to blue
  ask turtle 9[set heading 0]
  ask turtle 9[setxy -6 0]     ;;defining the start point of the packet
  ask turtle 9[set heading 90]
  ask turtle 9[forward 12] 
end 

to fullnetwork
   clear-all
   
   ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   ;; Fully Connected Configuration ;;
   ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   
   set-default-shape turtles "circle" ;Setting default shape of turtle to circle
   create-turtles 7                   ;Creating 7 turtles
   ask turtles[set color orange]      ;Setting the color of all turtles to orange
   ;;
   ;;setting the heading of turtles as per their appearance in fully connected topology
   ;;
   ask turtle 0[set heading 270]
   ask turtle 3[set heading 270]
   ask turtle 1[set heading 90]
   ask turtle 4[set heading 90]
   ask turtle 2[set heading 180]
   ask turtles[set pen-mode "down"]  ;Setting pen mode to down so that turtles leave a trail as they move
   ;;
   ;;defining movement of turtles
   ;; 
   ask turtle 0[forward 5]
   ask turtle 3[forward 5]
   ask turtle 1[forward 5]
   ask turtle 4[forward 5]
   ask turtle 2[forward 5]
   ;;setting heading of turtle 4
   ask turtle 3[set heading 135]
   ;;setting movement of turtle 4
   ask turtle 3[forward 7]
   ;;setting heading of turtle 5
   ask turtle 4[set heading 225]
   ;;setting movement of turtle 5
   ask turtle 4[forward 7]
   loop
   [ packetfull ;;calling function packetfull
     stop
   ]
end 

;;function packetfull

to packetfull
  ;;
  ;;function to show packet transmission in fully connected network
  ;;
  ask turtle 6[set color blue] ;;setting color of packet to blue
  ask turtle 6[set pen-mode "up"]
  ask turtle 6[set heading 0]
  ask turtle 6[setxy -5 0]  ;;defining the start point of the packet
  ask turtle 6[set heading 90]
  ask turtle 6[forward 10]
end 

to star
   clear-all 
     
   ;;;;;;;;;;;;;;;;;;;;;;;;
   ;; Star Configuration ;;
   ;;;;;;;;;;;;;;;;;;;;;;;;
   
   set-default-shape turtles "circle" ;Setting default shape of turtle to circle
   create-turtles 10                   ;Creating 10 turtles
   ask turtles[set color red]         ;Setting the color of all turtles to red
   ;;
   ;;setting the heading of turtles as per appearance in star topology
   ;;
   ask turtle 0[set heading 0] 
   ask turtle 1[set heading 45]
   ask turtle 2[set heading 90]
   ask turtle 3[set heading 135]
   ask turtle 4[set heading 180]
   ask turtle 5[set heading 225]
   ask turtle 6[set heading 270]
   ask turtle 7[set heading 315]
   ask turtle 8[set heading 0]
   ask turtles[set pen-mode "down"]  ;Setting pen mode to down so that turtles leave a trail as they move
   ;;
   ;;defining movement of turtles
   ;; 
   ask turtle 1[forward 10]
   ask turtle 2[forward 10]
   ask turtle 3[forward 10]
   ask turtle 4[forward 10]
   ask turtle 5[forward 10]
   ask turtle 6[forward 10]
   ask turtle 7[forward 10]
   ask turtle 8[forward 10]
      loop
   [
   packetstar ;;calling function packetstar
   stop
   ]
end 

;;functioncall

to packetstar
   ;;
   ;;packet transmission in star configuration
   ;;
   ask turtle 9[setxy 0 10] ;;;;defining the start point of the packet
   ask turtle 9[set color blue] ;;setting colour of packet to blue
   ask turtle 9[set heading 180]
   ask turtles[set pen-mode "up"]
   ask turtle 9[forward 10]
   ask turtle 9[set heading 135]
   ask turtle 9[forward 10]
end  

to go
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Ring Configuration ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;
  
  set-default-shape turtles "circle" ;Setting default shape of turtle to circle
  create-turtles 7                   ;Creating 7 turtles
  ask turtles[set color yellow]      ;Set color to yellow
  ;;
  ;;Defining headings of different turtles
  ;;
  ask turtles[set heading 0]
  ask turtles [forward 10]
  ask turtles [set pen-mode "down"] ;Setting pen mode to down so that turtles leave a trail as they move
  ;;
  ;;making all turtles move to 72 degrees
  ;;
  ask turtle 1[set heading 72]
  ask turtle 2[set heading 72]
  ask turtle 3[set heading 72]
  ask turtle 4[set heading 72]
  ask turtle 5[set heading 72]
  ;;
  ;;Defining movement of turtles
  ;;
  ask turtle 1[forward 10]
  ask turtle 2[forward 10]
  ask turtle 3[forward 10]
  ask turtle 4[forward 10]
  ask turtle 5[forward 10]
  ;;
  ;;making remaining turtles move by 144 degrees
  ;;
  ask turtle 2[set heading 144]
  ask turtle 3[set heading 144]  
  ask turtle 4[set heading 144]
  ask turtle 5[set heading 144]
  ;;
  ;;Defining movement of turtles
  ;;   
  ask turtle 2[forward 10]
  ask turtle 3[forward 10]
  ask turtle 4[forward 10]
  ask turtle 5[forward 10]
  ;;
  ;;make remaining turtles move by 216 degrees
  ;;
  ask turtle 3[set heading 216]
  ask turtle 4[set heading 216]
  ask turtle 5[set heading 216]
  ;;
  ;;Defining movement of turtles
  ;;
  ask turtle 3[forward 10]
  ask turtle 4[forward 10]
  ask turtle 5[forward 10]
  ;;
  ;;move remaining turtles move by 288 degrees
  ;;
  ask turtle 4[set heading 288]
  ask turtle 5[set heading 288]
  ;;
  ;;Defining movement of turtles
  ;;
  ask turtle 4[forward 10]
  ask turtle 5[forward 10]
  ;;
  ;;moving the last turtles back to 0 degrees
  ;;
  ask turtle 5[set heading 360]
  ;;
  ;;defining movement of turtle
  ;;
  ask turtle 5[forward 10]
  loop
  [ packetring ;;calling function packetring
    stop
  ]
end 

to packetring
  ask turtle 6[set pen-mode "up"]
  ask turtle 6[set color blue] ;;setting colour of packet to blue
  ask turtle 6[set heading 72]
  ask turtle 6[forward 10]
  ask turtle 6[set heading 144]
  ask turtle 6[forward 10]
end 

to bus
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;
  ;; Bus Configuration ;;
  ;;;;;;;;;;;;;;;;;;;;;;;
  
  create-turtles 10                  ;Creating 10 turtles
  ;set-default-shape turtles "square" to represent nodes               
  ask turtle 1[set shape "square"]
  ask turtle 2[set shape "square"]
  ask turtle 3[set shape "square"]
  ask turtle 5[set shape "square"]
  ask turtle 6[set shape "square"]
  ask turtle 7[set shape "square"]
  ask turtle 0[set shape "square"]
  ;set-default-shape turtles "circle" for representing terminators of the bus topology   
  ask turtle 4[set shape "circle"]
  ask turtle 8[set shape "circle"]
  ask turtles[set color blue]        ;Setting color of turtles to blue
  ;;
  ;;Defining headings of turtles
  ;;
  ask turtle 0[set heading 90]
  ask turtle 1[set heading 90]
  ask turtle 2[set heading 90]
  ask turtle 3[set heading 90]
  ask turtle 4[set heading 90]
  ask turtle 5[set heading 270]
  ask turtle 6[set heading 270]  
  ask turtle 7[set heading 270]
  ask turtle 8[set heading 270]
  ;making the turtles leave a trail
  ask turtles [set pen-mode "down"]
  ;defining the movement of turtles
  ask turtle 1[forward 2]
  ask turtle 2[forward 4]
  ask turtle 3[forward 6]
  ask turtle 4[forward 8]
  ask turtle 5[forward 2]
  ask turtle 6[forward 4]
  ask turtle 7[forward 6]
  ask turtle 8[forward 8]
  ;movement of turtle 1 upwards
  ask turtle 1[set heading 0]
  ask turtle 1[forward 5]
  ;movement of turtle 2 downwards
  ask turtle 2[set heading 180]
  ask turtle 2[forward 5]
  ;movement of turtle 3 upwards
  ask turtle 3[set heading 0]
  ask turtle 3[forward 5]
  ;movement of turtle 6 downwards
  ask turtle 6[set heading 180]
  ask turtle 6[forward 5]
  ;movement of turtle 5 upwards
  ask turtle 5[set heading 0]
  ask turtle 5[forward 5]
  ;movement of turtle 7 upwards
  ask turtle 7[set heading 0]
  ask turtle 7[forward 5]
  ;movement of turtle 0 downwards
  ask turtle 0[set heading 180]
  ask turtle 0[forward 5]
  ;no movement defined for turtle 4 and 8 since they act as terminators or imply that the pattern continues
  loop
  [ packetbus ;;calling function packetbus
    stop
  ]
end 

to packetbus
  ;;
  ;;function to show the packet transmission in bus configuration
  ;;
  ask turtle 9[set pen-mode "up"]
  ask turtle 9[set color pink] ;;setting colour of packet to pink
  ask turtle 9[setxy -6 5] ;;defining the start point of the packet
  ask turtle 9[set heading 180]
  ask turtle 9[forward 5]
  ask turtle 9[set heading 90]
  ask turtle 9[forward 5.8]
  ask turtle 9[set heading 180]
  ask turtle 9[forward 5]
end 

to tree
    clear-all
    
    ;;;;;;;;;;;;;;;;;;;;;;;;
    ;; Tree configuration ;;
    ;;;;;;;;;;;;;;;;;;;;;;;;  
    
    create-turtles 12                ;Creating 12 turtles
    ask turtles[set color white]      ;Defining colour of turtles as white to maintain uniformity
    ask turtles[set shape "square"]
    ask turtles [set pen-mode "down"] ;Setting pen mode so that turtles leave a trail
    ;defining turtle heading and movement
    ask turtle 1[set heading 120]     
    ask turtle 1[forward 12]
    ask turtle 2[set heading 180]
    ask turtle 2[forward 7]
    ask turtle 3[set heading 240]
    ask turtle 3[forward 12]
    ask turtle 4[set heading 240]
    ask turtle 4[forward 12]
    ask turtle 5[set heading 240]
    ask turtle 5[forward 12]
    ask turtle 4[set heading 135]
    ask turtle 4[forward 5]
    ask turtle 5[set heading 225]
    ask turtle 5[forward 5]
    ask turtle 6[set heading 180]
    ask turtle 6[forward 7]
    ask turtle 7[set heading 180]
    ask turtle 7[forward 7]
    ask turtle 8[set heading 180]
    ask turtle 8[forward 7]
    ask turtle 6[set heading  180]
    ask turtle 6[forward 5]
    ask turtle 7[set heading 135]
    ask turtle 7[forward 5]
    ask turtle 8[set heading 225]
    ask turtle 8[forward 5]
    ask turtle 9[set heading 120]
    ask turtle 9[forward 12]
    ask turtle 10[set heading 120]
    ask turtle 10[forward 12]
    ask turtle 9[set heading 135]
    ask turtle 9[forward 5]
    ask turtle 10[set heading 225]
    ask turtle 10[forward 5]   
    loop
    [
      packettree ;;calling function packettree
      stop
    ] 
end 

to packettree
  ;;
  ;;function to show transmission of packet in tree configration 
  ;;
  ask turtle 11[set color blue] ;;setting colour of packet to blue
  ask turtle 11[set pen-mode "up"]
  ask turtle 11[set heading 180]
  ask turtle 11[setxy -4 -10] ;;defining the start point of the packet
  ask turtle 11[set heading 45]
  ask turtle 11[forward 5]
  ask turtle 11[set heading 0]
  ask turtle 11[forward 7]
  ask turtle 11[set heading 125]
  ask turtle 11[forward 12]
  ask turtle 11[set heading 220]
  ask turtle 11[forward 4.7]
end      

to mesh
  clear-all
  
  ;;;;;;;;;;;;;;;;;;;;;;;;
  ;; Mesh Configuration ;;
  ;;;;;;;;;;;;;;;;;;;;;;;;
  
  ;;
  ;;arbitrary connection of nodes
  ;;
  create-turtles 10 ;Creating 10 turtles
  ask turtles[set color green] ;setting color as green to maintain uniformity in colour
  ask turtles[set pen-mode "down"] ;making the turtles leave a trail
  ;;
  ;;defining heading and movement for turtles
  ;;
  ask turtle 1[set heading 0]
  ask turtle 1[forward 8]
  ask turtle 2[set heading 90]
  ask turtle 2[forward 8]
  ask turtle 3[set heading 180]
  ask turtle 3[forward 8]
  ask turtle 4[set heading 270]
  ask turtle 4[forward 8]
  ask turtle 5[set heading 0]
  ask turtle 5[forward 8]
  ask turtle 6[set heading 90]
  ask turtle 6[forward 8]
  ask turtle 7[set heading 180]
  ask turtle 7[forward 8]
  ask turtle 8[set heading 270]
  ask turtle 8[forward 8]
  ask turtle 5[set heading 270]
  ask turtle 5[forward 8]
  ask turtle 6[set heading 0]
  ask turtle 6[forward 8]
  ask turtle 7[set heading 90]
  ask turtle 7[forward 8]
  ask turtle 8[set heading 180]
  ask turtle 8[forward 8]
  ask turtle 1[set heading 90]
  ask turtle 1[forward 8]
  ask turtle 1[set heading 270]
  ask turtle 1[forward 8]
  ask turtle 5[set heading 180]
  ask turtle 5[forward 8]
  ask turtle 5[set heading 360]
  ask turtle 5[forward 8]
  ask turtle 8[set heading 90]
  ask turtle 8[forward 8]
  ask turtle 8[set heading 270]
  ask turtle 8[forward 8]
  ask turtle 7[set heading 0]
  ask turtle 7[forward 8]
  ask turtle 7[set heading 180]
  ask turtle 7[forward 8] 
  loop
[
 packetmesh ;;calling function packetmesh
 stop 
]
end 

;;packetmesh function

to packetmesh
  ;;
  ;;function to show packet transmission in mesh topology
  ;;
  ask turtle 9[set pen-mode "up"]
  ask turtle 9[set color blue] ;;setting color of packet to blue
  ask turtle 9[set heading 0]
  ask turtle 9[setxy -8 8] ;;defining the start point of the packet
  ask turtle 9[set heading 90]
  ask turtle 9[forward 8]
  ask turtle 9[set heading 180]
  ask turtle 9[forward 16]
  ask turtle 9[set heading 90]
  ask turtle 9[forward 8]
end 

There is only one version of this model, created over 7 years ago by Gagana B.

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