LAYER 2 vs LAYER 3 BROADCAST


hai everyone…
I’m confused with layer 2 broadcast and layer 3 broadcast…can u plz xplain with real scenario …thank in advance…

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    You and 2 others like this.
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    Yogesh Kokadwar Bhai mere layer 2 broadcast hota he Lekin layer 3 multicast hota he normally
    3 hrs · Like · 1
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    Muhammad Khan 255.255.255.255 layer 3 b.cast
    ff:ff:ff:ff:ff layer 2 b.cast..
    In simple words
    2 hrs · Like · 3
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    Binoj Sasidharan Layer 2 broadcasts are sent to the broadcast mac address ffff:ffff:ffff if ethernet and so can be received by any device in the same broadcast domain . Layer 3 broadcasts are sent to the broadcast network address, which for an ip network of 10.1.1.0/24 would be 10.1.1.255. If the IP network was over ethernet, a layer 3 broadcast would also result in a layer 2 broadcast
    • 2 hrs · Like · 1
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      Abhi Singh Broadcast frames usually have a hosts MAC/IP address in the SA field.
      An example of a layer 2 broadcast is an ARP Request.
      in an ARP request Host A [IP=10.1.1.5 MAC=AA:B2.CD] knows the destination IP I want [10.1.1.11], but do not know the destination MAC address, so it is a unicast L3/broadcast L2.
      Frame [dMAC=ff:ff:ff][sMAC=AA:B2:CD][dIP=10.1.1.11][sIP=10.1.1.5][PDU]
      An example of a layer 3 broadcast is DHCP DISCOVER. My host knows its own MAC but doesn’t know my IP, I don’t know the destination IP or MAC so is broadcast L3 and broadcast L2
      Frame [dMAC=ff:ff:ff][sMAC=AA:B2:CD][dIP=255.255.255.255][sIP=0.0.0.0][PDU]
      2 hrs · Like · 4
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      Abhi Singh Please advise Sumit Sharma Sir…
      1 hr · Unlike · 1
    •  
      Abhi Singh Need your input here…
      1 hr · Unlike · 1
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      Sumit Sharma LAYER 2 BROADCAST
      ==> broadcast L2 frame has the dst MAC set to ff-ff-ff-ff-ff-ff.
      ==> Means broadcast will be done in a particular subnet only.
      So, Broadcast will stay inside the boundary of a single network or single subnet, where broadcast originated

 

 

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3 comments

  1. Hello Sumit sir..How r u ?

    I have one doubt..

    We have HP device in our network… Device is reachable. ICMP enabled. We can also see the mac-address of device. But we are unable to take telnet/SSH session of device. Even telnet is enable on the device. but right now, unable to take telnet seesion. What is the cause/problem for that.

    Like

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