Notes  on  Hybrid  topology:   Hybrid  topology  is  an  integration  of  two  or  more  different  topologies  to  form   a  resultant  topology  which  has  many  advantages  (as  well  as  disadvantages)   of  all  the  constituent  basic  topologies  rather  than  having  characteristics  of   one  specific  topology.  This  combination  of  topologies  is  done  according  to  the   requirements  of  the  organization.     For  example,  if  there  is  a  ring  topology  in  one  office  department  while  a  bus   topology  in  another  department,  connecting  these  two  will  result  in  Hybrid   topology.  Star-­‐Ring  and  Star-­‐Bus  networks  are  most  common  examples  of   hybrid  network.       These  are  two  examples  of  hybrid  topology:       Star-­‐Bus:  The  star  bus  topology  is  combined  with  the  linear  bus  in  large   networks.  In  such  cases  the  linear  bus  provides  a  backbone  that  connects   multiple  stars.       Star  Ring:  The  Star  Ring  is  a  combination  of  ring  and  star  topologies.  The   hubs  in  a  star  ring  are  connected  in  a  star  pattern  by  the  main  hub.     Advantages  of  Hybrid  Network  Topology   1) Reliable:  Unlike  other  networks,  fault  detection  and  troubleshooting  is   easy  in  this  type  of  topology.  The  part  in  which  fault  is  detected  can  be   isolated  from  the  rest  of  network  and  required  corrective  measures  can   be  taken,  without  affecting  the  functioning  of  rest  of  the  network.     2)  Scalable:  It  is  easy  to  increase  the  size  of  network  by  adding  new   components,  without  disturbing  existing  architecture.     3)  Flexible:  Hybrid  Network  can  be  designed  according  to  the   requirements  of  the  organization  and  by  optimizing  the  available   resources.  Special  care  can  be  given  to  nodes  where  traffic  is  high  as  well   as  where  chances  of  fault  are  high.     4)  Effective:  Hybrid  topology  is  the  combination  of  two  or  more   topologies,  so  we  can  design  it  in  such  a  way  that  strengths  of  constituent   topologies  are  maximized  while  there  weaknesses  are  neutralized.  For   example  we  saw  Ring  Topology  has  good  data  reliability  (achieved  by  use   of  tokens)  and  Star  topology  has  high  tolerance  capability  (as  each  node  is   not  directly  connected  to  other  but  through  central  device),  so  these  two   can  be  used  effectively  in  hybrid  star-­‐ring  topology.       Disadvantages  of  Hybrid  Topology   1)  Complexity  of  Design:  One  of  the  biggest  drawbacks  of  hybrid  topology  is   its  design.  It  is  not  easy  to  design  this  type  of  architecture  and  it  is  a  tough  job   for  designers.  Configuration  and  installation  process  needs  to  be  very   efficient.   2)  Costly  Hub:  The  hubs  used  to  connect  two  distinct  networks,  are  very   expensive.  These  hubs  are  different  from  usual  hubs,  as  they  need  to  be   intelligent  enough  to  work  with  different  architectures  and  should  be   function  even  if  a  part  of  network  is  down.   3)  Costly  Infrastructure:  As  hybrid  architectures  are  usually  larger  in  scale,   they  require  a  lot  of  cables;  cooling  systems,  and  sophisticate  network   devices.         Assignment #4: 20 points Using the book, Hybrid Topology Documentation (located under Files), and your research, complete the following network design: • • • 300 tables represent 300 computers 2 story-restaurant represent 2 computer labs located at different floors of a 2 story building. 150 computers are located in a computer lab at the first floor of the building while another 150 computers are placed in another computer lab at the second floor of the same building. You will have to sketch your network design for 300 computers in a two-story building. Design your network based on what you have learned e.g. linear bus, ring, star, and tree, notes given and the task given. *** If you can not sketch it out on the computer, you can turn it in in person next class OR you can submit a write up explaining your network using a minimum of 250 words.       Instructions  for  Activity  7:     - 300 tables represent 300 computers 2 storey-restaurant represent 2 computer labs located at different floors of a 2 storey building. 150 computers are located in a computer lab at the first floor of the building while another 150 computers are placed in another computer lab at the second floor of the same building. You will have to sketch your network design for 300 computers in a two-storey building. Teacher will provide notes on hybrid topology and you will be asked to come out with your own version of hybrid computer network topology. Design your network based on what you have learned e.g. linear bus, ring, star, and tree, notes given and the task given.  
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