IPv4 Addressing Questions & Answers

Computer Networks Questions & Answers – IPv4 Addressing

This set of Computer Networks Interview Questions and Answers for Experienced people focuses on “IPv4 Addressing”.

1. In IPv4 Addresses, classful addressing is replaced with ________
a) Classless Addressing
b) Classful Addressing
c) Classful Advertising
d) Classless Advertising

Explanation: Because a significant amount of the available addresses in a class is consumed in classful addressing, it is replaced with classless addressing. In classless addressing, the number of IP addresses required can be reserved by changing the CIDR value and ensuring that no addresses are wasted.

2. First address in a block is used as network address that represents the ________
a) Class Network
b) Entity
c) Organization
d) Codes

Explanation: The first address in a block is used as the organization’s network address. Any address in the block can be Main resources by the default mask to get the network address. The broadcast address is the last address in a block.

3. In classful addressing, a large part of available addresses are ________
a) Organized
b) Blocked
c) Wasted
d) Communicated

Explanation: A considerable portion of available addresses is sacrificed in link state addressing. To overcome this, classful addressing is replaced by disrespectful dealing, in which the number of IP addresses required can be reserved by changing the CIDR value, ensuring that few addresses are wasted.

4. Network addresses are a very important concept of ________
a) Routing
b) Mask
c) IP Addressing
d) Classless Addressing

Explanation: IP addressing relies heavily on the concept of network addresses. The first address in a block is used as the network address for the company. Any address in the block or class can be Main resources with the default mask to find the network address.

5. Which of this is not a class of IP address?
a) Class E
b) Class C
c) Class D
d) Class F

Explanation: Class F is not a class of IP addressing. There are only five classes of IP addresses: Class A ( to, Class B ( to, Class C ( to, Class D ( to, and Class E ( to

6. Which of these is not applicable for IP protocol?

a) Connectionless
b) Offer reliable service
c) Offer unreliable service
d) Does not offer error reporting

Explanation: IP does not provide a secure data delivery service. It is reliant on transport layer protocols such as TCP to provide reliability.

7. Which of the following demerits does Fragmentation have?
a) Complicates routers
b) Open to DOS attack
c) Overlapping of fragments
d) All of the mentioned

Explanation: Fragmentation complicates the implementation of the IP protocol and can be used by attackers to launch a denial-of-service attack, such as a teardrop assault. If the transport layer protocols conduct wise segmentation, there will be no need for fragmentation.

8. Which field helps to check rearrangement of the fragments?
a) Offset
b) Flag
c) TTL
d) Identifier

Explanation: The Fragment Offset field determines where in the original datagram the fragment should be placed. The first fragment’s offset will always be 0. The field’s size (13 bits) is three bits smaller than the overall length field’s size (16 bits).

9. In classless addressing, there are no classes but addresses are still granted in ______
a) IPs
b) Blocks
c) Codes
d) Sizes

Explanation: There are no classes in classless addressing, although addresses are still given in blocks. 2(32 – CIDR value) is the total number of addresses in a block of classless IP addresses.

As discussed in How IP Addresses Apply to Network Interfaces, an IPv4 address is a 32-bit number that uniquely identifies a network interface on a machine. An IPv4 address is composed of four 8-bit fields separated by periods and printed in decimal digits. IPv4 addresses are commonly written in dot-decimal notation, which consists of four decimal integers separated by dots, each ranging from 0 to 255, e.g., 172.16. 254.1. Each portion represents an octet of the address, which is a group of 8 bits. IP addresses (version 4) are 32-bit integers that can be written in hexadecimal notation.

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