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An ISP has requested a block of 1000 addresses. How many blocks are granted to it?
  • a)
    512
  • b)
    1000
  • c)
    1024
  • d)
    None of the mentioned
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
An ISP has requested a block of 1000 addresses. How many blocks are gr...
Explanation:
- An IP address is a 32-bit number that uniquely identifies a device on the internet.
- The IP address is divided into two parts: network address and host address.
- The network address is used to identify the network, while the host address is used to identify the device on that network.
- The IP address is divided into classes, and each class has a different number of network and host bits.
- The most commonly used classes are A, B, and C.
- Class A has 8 bits for network and 24 bits for host.
- Class B has 16 bits for network and 16 bits for host.
- Class C has 24 bits for network and 8 bits for host.
- An ISP that requests a block of 1000 addresses would require a Class C network, which has 256 possible network addresses and 256 possible host addresses.
- Therefore, the ISP would be granted 4 blocks of Class C networks, which is equal to 1024 addresses (4 x 256).
- Hence, the correct answer is option 'C' (1024).
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Community Answer
An ISP has requested a block of 1000 addresses. How many blocks are gr...
The number of blocks allotted can only be in the powers of 2.
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Which of the following statement is true for Power-of-2 allocators? Buddy System splits and recombines memory blocks in a predetermined manner during allocation and deallocation. No splitting of blocks takes place, also no effort is made to coalesce adjoining blocks to form larger blocks; when released, a block is simply returned to its free list. When a request is made for m bytes, the allocator first check the free list containing blocks whose size is 2i for the smallest value of i such that 2i ≥ m.if the free list is empty ,it checks the list containing blocks that are higher the next higher power of 2 in size on so on. an entire block is allocated to a request. When a request is made for m bytes. the system finds the smallest power of 2 that is ≥ m. Let this be 2i.if the list is empty, it checks the lists for block of size 2i+1.it takes one block off this list and splits it into two halves of size 2i.it put one of these blocks into the free list of size 2i,and uses the other block to satisfy the request.

Which of the following statement is true for buddy system allocators? Buddy System splits and recombines memory blocks in a predetermined manner during allocation and deallocation. No splitting of blocks takes place, also no effort is made to coalesce adjoining blocks to form larger blocks; when released, a block is simply returned to its free list. When a request is made for m bytes, the allocator first check the free list containing blocks whose size is 2i for the smallest value of i such that 2i ≥ m.if the free list is empty ,it checks the list containing blocks that are higher the next higher power of 2 in size on so on. an entire block is allocated to a request. When a request is made for m bytes. the system finds the smallest power of 2 that is ≥ m. Let this be 2i.if the list is empty, it checks the lists for block of size 2i+1.it takes one block off this list and splits it into two halves of size 2i.it put one of these blocks into the free list of size 2i,and uses the other block to satisfy the request.

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An ISP has requested a block of 1000 addresses. How many blocks are granted to it?a)512b)1000c)1024d)None of the mentionedCorrect answer is option 'C'. Can you explain this answer?
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