FB DISCUSSIONS: WHY WE NEED IP ADDRESS ?


CISCO INTERVIEW
We have the MAC address to uniquely identify the network components ?
Then, why we need the IP address for identification ?
What is the logic ?
Complete Set Of Questions, click below
https://networkproxy.wordpress.com/…/company-interview-ques…/

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  • Chakkaravarthi Vinayagam In layered architecture we can’t route the packets with the help of #MAC_address if we do so our entire internet domain act as a single cluster. If we use #IP_address we can create multiple cluster like what we have in today internet domain. We can able to identify problems and avoid unnecessary routing into our private network.
  • Sajad Wani Bcoz , mac communication is limited to layer 2 of the device , for global identification we need ip address which works on layer 3 of the device
  • Rytesh Vishwakarma ip is used to locate the network
    Mac is used to locate the host on that network.
    While communicating with remote hosts we dont use the mac of the destination host instead we use the mac of our default gateway….
    Our ip takes us to that network afterwards we use arp to find the mac of the destination host.
    • Cisco Sahil Thats right .. Both are used for identification …. But there should be some logic behind using each & every term. Will check out ..
    • Ajay Kumar interfaces can be change while ip network ID remain same
    • Ajay Kumar when we trace someone……….. you can understand what we do or what we can
    • Cisco Sahil Here, we are talking about mechanism, which is perfectly right, as said in above comments. But friends we need some more strong logic to justify.
    • Rytesh Vishwakarma ip is used to locate the network Mac is used to locate the host on that network. While communicating with remote hosts we dont use the mac of the destination host instead we use the mac of our default gateway…. Our ip takes us to that network afterwards we use arp to find the mac of the destination host.
    • Aditya Uppalapati In case of multi layer switch we can use two commands to locate the switch port and router port
    • Cisco Sahil Ajay Kumar .. Yes you are right, using Layer 2 trace route & Layer 3 trace route, we can understand complete network. This is the mechanism to understand. But we need to go into background to understand the designing basics of MAC address & IP.
    • Usman Tahir we need the ip address to logically identify the hosts because the ip address is logical address to send traffic between the end to end hosts.
    • Usman Tahir in other words mac address is used to identify a host only on a link but ip address is used to identify a host within the whole network.
      • Bhasker Reddy Each sub interface can assign logical ip but we cant assign 1 mac address to ever sub interfaces
      • Sajad Wani Ya Rytesh ! Frame never leaves the default gateway , now the frame will be encapsulated(packet) with the Ip address and decapsulated on the other end.
      • Mohammed Yunus mac address is identification , and Ip is an address , for ex : post letter Name is identification (mac) and Address is IP , without name or address we cont send the letter , that’s like mac and Ip
      • Mohammed Yunus mac address is identification , and Ip is an address , for ex : post letter Name is identification (mac) and Address is IP , without name or address we cont send the letter , that’s like mac and Ip
      • Adel Issad We have the MAC @ to identify the network components but IP @ identify where is the component is in the network (identify the component end the subnet)
      • Sumit Sharma Complete set of questions given on below link
      • Sumit Sharma https://networkproxy.wordpress.com/…/company-interview…/

        BASED ON CANDIDATE’S EXPERIENCE’S DATE:…
        NETWORKPROXY.WORDPRESS.COM
        • Sumit Sharma UPDATED: 18-12-14
        • Sumit Sharma Dear Members, Thanks all for your inputs. Everyone got the right point. Mechanism explanation is absolutely right.
        • Fahad Ahmed If a device or a host is on another network, then we need to have its ip address as the routers need ip address of a machine to forward the packets.
        • Sumit Sharma One very good logic given by candidate: MAC address is used for identification, true, But MAC addresses cannot be summarized, Individually they could have made the routing table very large, which is impossible to be handled by the network devices. Whereas, IP’s can be summarized, this is what we are doing in our network, that’s why network devices are able to handle routing tables.
        • Jameel we need ip addresses to route traffic
        • Manish Sharma Hi….the reason could be for mac- address there is no hierarchy…..so it would be difficult to separate one network from another….but for IP addressing we can logically divide this and thus it is used …
        • Noor Mohamad Kanjwal mac address r like finger print… its uniq 4 every human but we use names to identfy them ..same way we use ip address to identfy ny device..its logical address easy to use n remember than mac address
          • Mohamed Salman this was my ques when i just started ccna and i ended up makin my own ans just as Sumit Sharma mentioned…but my way of thinkin ws ip address is kinda standard and everyone uses the same standard whc ends up doin SUMMERIZATION ..but when it comes in terms of MAC the 1st part is vender specific..if som new vender comes up tomm then he will make up his own range of MAC which would mess up things if we are communicating in wan in terms of MAC.. i hope i was able to keep my thought
          • Fahad Ahmed Sumit Mac address is used to identify a device or a host on LAN but IP address is used to identify a device or a host on Internet.
          • Asan Mydeen E S IP addresses (Network portion) are used to locate the networks whereas the Mac address are used to find the host within the Lan network (by ARP )
          • Priyanka Nath MAC address for Switched network.
            IP address for Rouing network.
          • Sumit Sharma Mohamed Salman .. You got the right logic .. !!
          • Sumit Sharma One thing: SCALABILITY: IP’s have standard format, MAC address don’t have ( Varies from vendor to vendor ). So, there cannot be summarization. Without summarization, Its not feasible at all to handle routing table in live environment. This is a strong reason, we are using ip’s.
            20 hrs · Like · 4
          • Fahad Ahmed But don’t mac address has 13 bits notation?
          • Abhay Karanwal a network consist of Ethernet cable, serial cable, FR PVCs and ATM PVCs, MPLS …… all the medium have different header type at layer two.

 

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