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IP Address Basics (IPv4 & IPv6)

Introduction

An IP address is a unique identifier assigned to devices connected to a network. Questions on IPv4 and IPv6 are very common in banking, SSC, and technical awareness exams because they test basic networking knowledge and factual clarity.

Pattern: IP Address Basics (IPv4 & IPv6)

Pattern

An IP address uniquely identifies a device on a network, and it exists mainly in two versions: IPv4 and IPv6, which differ in length, format, and capacity.

Step-by-Step Example

Question

Which of the following correctly describes an IPv4 address?

Options:
A. 32-bit numeric address
B. 64-bit hexadecimal address
C. 128-bit numeric address
D. Alphabet-only address

Solution

  1. Step 1: Recall IPv4 characteristics

    IPv4 was the first widely used version of IP addressing.

  2. Step 2: Match bit length and format

    IPv4 uses a 32-bit numeric address written in dotted decimal format.

  3. Final Answer:

    32-bit numeric address → Option A

  4. Quick Check:

    Example 192.168.1.1 confirms IPv4 format ✅

Quick Variations

• Address written as four numbers separated by dots → IPv4

• Address written in hexadecimal with colons → IPv6

• Introduced to solve IP address shortage → IPv6

Trick to Always Use

  • Step 1 → Dots and numbers → IPv4
  • Step 2 → Colons and hexadecimal → IPv6
  • Step 3 → Larger address space → IPv6

Summary

Summary

  • An IP address uniquely identifies a device on a network.
  • IPv4 uses a 32-bit addressing system.
  • IPv6 uses a 128-bit addressing system.
  • IPv6 was introduced to overcome IPv4 address exhaustion.

Example to remember:
192.168.1.1 → IPv4, 2001:db8::1 → IPv6

Practice

(1/5)
1. Which IP version uses dotted decimal notation such as 10.0.0.1?
easy
A. IPv4
B. IPv6
C. Both IPv4 and IPv6
D. Neither IPv4 nor IPv6

Solution

  1. Step 1: Identify the notation style

    Dotted decimal notation uses numbers separated by dots.

  2. Step 2: Match with IP version

    IPv4 addresses are written in dotted decimal format.

  3. Final Answer:

    IPv4 → Option A

  4. Quick Check:

    10.0.0.1 is a standard IPv4 address ✅
Hint: Dots with numbers always indicate IPv4.
Common Mistakes: Assuming IPv6 also uses dots.
2. Which IP version was introduced mainly to overcome the shortage of available IP addresses?
easy
A. IPv6
B. IPv4
C. ARP
D. MAC addressing

Solution

  1. Step 1: Identify the problem

    The question refers to exhaustion of IP addresses.

  2. Step 2: Match with the solution

    IPv6 was introduced to provide a much larger address space.

  3. Final Answer:

    IPv6 → Option A

  4. Quick Check:

    128-bit addressing solves IPv4 shortage ✅
Hint: Address shortage problem = IPv6.
Common Mistakes: Thinking IPv4 was upgraded to solve the issue.
3. Which of the following formats represents an IPv6 address?
easy
A. 172.16.0.1
B. 2001:0db8:85a3::8a2e:0370:7334
C. 255.255.255.0
D. 192.168.10.5

Solution

  1. Step 1: Observe the address format

    The address uses hexadecimal values separated by colons.

  2. Step 2: Match with IP version

    IPv6 addresses are written in hexadecimal with colon separators.

  3. Final Answer:

    2001:0db8:85a3::8a2e:0370:7334 → Option B

  4. Quick Check:

    Colon-separated hexadecimal confirms IPv6 ✅
Hint: Colons + hex digits = IPv6.
Common Mistakes: Mistaking subnet masks for IPv6.
4. How many bits are used in an IPv6 address?
medium
A. 32 bits
B. 64 bits
C. 128 bits
D. 256 bits

Solution

  1. Step 1: Recall IPv6 specification

    IPv6 was designed with a much larger address size.

  2. Step 2: Identify correct bit length

    IPv6 uses a 128-bit addressing system.

  3. Final Answer:

    128 bits → Option C

  4. Quick Check:

    Large address space confirms 128-bit IPv6 ✅
Hint: IPv6 always means 128 bits.
Common Mistakes: Confusing IPv6 with 64-bit architecture.
5. Which IP version supports a much larger number of devices due to its address capacity?
medium
A. IPv4 only
B. Both IPv4 and IPv6 equally
C. IPv4 with subnetting
D. IPv6

Solution

  1. Step 1: Compare address capacities

    The question focuses on the number of supported devices.

  2. Step 2: Match with IP version

    IPv6 provides an extremely large address pool.

  3. Final Answer:

    IPv6 → Option D

  4. Quick Check:

    128-bit addressing supports massive device growth ✅
Hint: More devices needed = IPv6.
Common Mistakes: Assuming subnetting fully solves IPv4 limits.

Mock Test

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