Please explain with correct examples 1 What are the differen

Please, explain with correct examples.

1) What are the differences between physical and logical address, and why do we need logical addresses?

2) Discuss IPv4 and IPv6 according to its capabilities to address a single device on any network in the world and how it correlates to the Internet of Things (IoT).

Solution

solution (a)-----------

BASIS FOR COMPARISON   LOGICAL ADDRESS   PHYSICAL ADDRESS

Basic    It is the virtual address generated by CPU   The physical address is a location in a memory unit.

Address Space   Set of all logical addresses generated by Set of all physical addresses mapped to the
CPU in reference to a program is referred corresponding logical addresses is referred as Physical Address.
as Logical Address Space.
  
Visibility   The user can view the logical address of The user can never view physical address of program
a program.
  
Access   The user uses the logical address to The user can not directly access physical address.
access the physical address.  

Generation   The Logical Address is generated by the CPU   Physical Address is Computed by MMU

Why do we need IP address?

ans) IP address allows you to look for the particular device which is having that IP address right
now while you are trying to reach it using a piece of software.IP address is used to deliver
the packets to an network by using network layer. it will be change when we are moving to another network.

Solution (b)----------

IPv4 and IPv4 Addressing Concepts :-

IPv4 IPv6

Mulitcast address space at 224.0.0.0/4 Multicast address space at FF00::/8
Has broadcast addresses for all devices No such concept in IPv6 (uses multicast groups)
Uses 0.0.0.0 as unspecified address Uses :: as unspecified address
Uses 127.0.0.1 as loopback address Uses ::1 as loopback address
Supports globally unique “public” addresses Supports globally unique unicast addresses
Uses 10.0.0.0/8, 172.16.0.0/16, and 192.168.0.0/16 as Uses FD00::/8 as unique local addresses
“private” addresses.

It has often been said that IPv6 and the Internet of Things are strongly aligned, to the extent that
claims are made they are mutually reliant. An Internet of Things needs the massively expanded protocol
address space that only IPv6 can provide, while IPv6 needs to identify a compelling use case to provide
a substantive foundation to justify the additional expenditures associated with a widespread deployment
of this new protocol that only the Internet of Things can provide. A good example of
this circular line of argument of mutual dependence is found in this ZDNet report of IPv6’s new “Killer App”.