(A) In IPv4 addressing, a block of address can be define as x.y.z.t/n in which…
2024
(A) In IPv4 addressing, a block of address can be define as x.y.z.t/n in which x.y.z.t define one of the address and /n define the mask
(B) The first address in the block can be found by setting the rightmost 32-n bits to 0s
(C) Address of class C is used for multicast communication
(D) There are five classes in IPv4 address
(E) Supernetting combine several networks into one large network
Choose the correct answer from the options given below:
- A.
(A), (B) and (C) Only
- B.
(A), (B), (D) and (E) Only
- C.
(A), (C), (D) and (E) Only
- D.
(C), (D) and (E) Only.
Attempted by 673 students.
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Correct answer: B
Explanation: Evaluate each statement.
In IPv4 addressing, a block can be defined as x.y.z.t/n where x.y.z.t is an address and /n is the prefix length (network mask). This is correct (CIDR notation).
The first address in the block is found by setting the rightmost 32−n bits to 0. That yields the network address (for example, 192.168.1.10/24 → network 192.168.1.0). This is correct.
The claim that Class C addresses are used for multicast is incorrect. Multicast addresses are in Class D (224.0.0.0–239.255.255.255).
There are five IPv4 address classes historically (A, B, C, D, and E); this statement is correct. Note that Class D is used for multicast and Class E is reserved.
Supernetting combines several networks into a larger network (used with CIDR to aggregate routes). This statement is correct.
Conclusion: The true statements are the ones describing CIDR notation, the rule to compute the first address by zeroing host bits, the existence of five IPv4 classes, and that supernetting aggregates networks. The correct answer is the choice that lists those four true statements.
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