Help describing this network situation

abcsundayabcsunday Registered Users Posts: 4 ■□□□□□□□□□
this is my problem/question
what is it called when two computers transmit at the same time along a network

i have no idea how to answer this question

thanks guys

Comments

  • Jon_CiscoJon_Cisco Member Posts: 1,772 ■■■■■■■■□□
    Is there any context to this question? My first though is it creates a collision but that is not necessarily the answer to your question. Is this referring to a single network segment. On a network lots of computers are always talking. Is there a term for it I don't really know. I'm not trying to answer your question for you just give you something to think about. Good Luck!
  • cyberguyprcyberguypr Senior Member Mod Posts: 6,926 Mod
    Homework? I'm assuming you are talking about CSMA/CD. I hate to be that guy but I can't believe you didn't Google this. Just did it and saw the answer with everything from simple to extremely thorough explanations.
  • abcsundayabcsunday Registered Users Posts: 4 ■□□□□□□□□□
    thanks for help for the tips i will double check on google
  • abcsundayabcsunday Registered Users Posts: 4 ■□□□□□□□□□
    i was thinking about "Full Duplex" or "collision" not sure.. are they the same ? i m really confused
  • cwshellhamercwshellhamer Member Posts: 90 ■■□□□□□□□□
    When two hosts "talk" at the same time on the same CD (collision domain) it causes a collision on the switch/hub. After the collision occurs they both wait a random amount of time and try to re-transmit until the frame is sent successfully.

    remember switches & hubs are collision domains
    routers are broadcast domains because they prevent collisions from happening. How? Wish i could tell you lol
    HAVE: A+
    Working on: N+, CCENT
    Associates Degree: Lincoln Technical Institute ( DO NOT GO!)
    Bachelors degree in progress: Computer Information Systems and Cyber security - Strayer University
  • Disgruntled3lfDisgruntled3lf A+, Net+, Sec+, CCNA, CCNA Security, Linux+, CDIA, Project+, LPIC-1, GCIH, GIAC Advisory Board, WGU Member Posts: 77 ■■■□□□□□□□
    REMOVED UNNECESSARY QUOTED REPLY FROM PREVIOUS POST Close but incorrect. Every device plugged into a hub is part of one big collision domain because a hub sends every packet out every port, less the one it came in on. Each port of a switch is a collision domain because a switch will look at it's internal table and only forward a packet out the port that is associated with the destination mac address. Every device on a switch is on a single broadcast domain. IE if I had a 24 port swithch with 24 devices I would have 24 collision domains and one broadcast domain. If I had two switches like above and connected them together directly I would have 48 collision domains and 1 broadcast domain. However, if I put a router between them I would have 48 collision domains (24 per switch) and 2 broadcast domains. As Jeremy Cioara says, " a router has 2 purposes in life. To route traffic and stop broadcasts." Edit: Felt like a jerk not ansering the OQ. I would say in that context (N+) it would be a collision.
  • markulousmarkulous Member Posts: 2,394 ■■■■■■■■□□
    @=cwshellhamer

    Just to clarify here...Hubs are a single collision domain whereas a switch has a collision domain on each port. It's one reason why you never want to use a hub on a network.

    Also, while a router does have separate collision domains on each port, you use routers to separate broadcast domains and switches to add additional collision domains.
  • cwshellhamercwshellhamer Member Posts: 90 ■■□□□□□□□□
    @Disgruntled3lf

    you had to cut that out of the book lol. Thanks for correcting/clarifying
    HAVE: A+
    Working on: N+, CCENT
    Associates Degree: Lincoln Technical Institute ( DO NOT GO!)
    Bachelors degree in progress: Computer Information Systems and Cyber security - Strayer University
  • abcsundayabcsunday Registered Users Posts: 4 ■□□□□□□□□□
    @Disgruntledelf

    thanks so much to explain this for me . from this way its so easy to understand what is collision domain

    again thanks so much
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