Introduction
The CompTIA Network+ (N10-008) certification is a globally recognized credential that validates an IT professional's ability to design, configure, manage, and troubleshoot wired and wireless networks. One of the key topics covered in the exam is IP addressing, including the identification of valid public IP addresses.
In this article, we will explore:
- What are Public IP Addresses?
- Key Differences Between Public and Private IP Addresses
- Three Valid Public IP Addresses (With Examples)
- How This Topic is Covered in the CompTIA Network+ Exam
- Why Study4Pass is the Best Resource for CompTIA Network+ Preparation
By the end of this guide, you will have a clear understanding of public IP addressing and how to approach related questions in the N10-008 exam.
Understanding Public IP Addresses
A public IP address is a unique identifier assigned to a device connected to the internet. These addresses are globally routable, meaning they can be accessed from anywhere on the internet. Public IPs are assigned by Internet Assigned Numbers Authority (IANA) and distributed through Regional Internet Registries (RIRs).
Characteristics of Public IP Addresses:
- Globally unique – No two devices on the internet can have the same public IP.
- Assigned by ISPs – Internet Service Providers allocate public IPs to customers.
- Used for internet communication – Essential for accessing websites, servers, and online services.
Public vs. Private IP Addresses
Before identifying valid public IPs, it's important to distinguish them from private IP addresses, which are used within local networks (LANs).
Private IP Address Ranges (RFC 1918):
- 10.0.0.0 – 10.255.255.255 (Class A)
- 172.16.0.0 – 172.31.255.255 (Class B)
- 192.168.0.0 – 192.168.255.255 (Class C)
Any IP address outside these ranges (and not reserved for special purposes) is considered a public IP address.
Three Valid Public IP Addresses (Exam Focus)
The CompTIA Network+ Exam may ask you to identify valid public IP addresses from a given list. Below are three examples of valid public IPs:
1. 8.8.8.8
- Why is it valid?
- This is a well-known Google DNS server address.
- It falls outside private IP ranges and is routable on the internet.
2. 203.0.113.45
- Why is it valid?
- Part of the TEST-NET-3 range (203.0.113.0/24), reserved for documentation but still a public IP.
- Not in any private or reserved IP block.
3. 198.51.100.22
- Why is it valid?
- Belongs to TEST-NET-2 (198.51.100.0/24), used for examples but still a public IP.
- Not part of RFC 1918 private ranges.
Invalid Public IP Examples (For Comparison)
- 192.168.1.1 → Private (Class C)
- 10.0.0.1 → Private (Class A)
- 172.16.0.1 → Private (Class B)
How CompTIA Network+ (N10-008) Tests This Concept?
The exam may present questions in various formats:
- Multiple-choice: "Which of the following is a valid public IP address?"
- Drag-and-drop: Matching IPs to public or private categories.
- Performance-based: Configuring a router with correct public IP settings.
Study Tips for IP Addressing in N10-008:
- Memorize private IP ranges (10.x.x.x, 172.16.x.x – 172.31.x.x, 192.168.x.x).
- Recognize reserved IPs (e.g., 127.0.0.1 for loopback, 169.254.x.x for APIPA).
- Practice subnetting to differentiate public vs. private IPs.
Why Study4Pass is the Best for CompTIA Network+ Preparation?
Preparing for the CompTIA Network+ (N10-008) exam requires high-quality study materials, practice tests, and expert guidance. Study4Pass is a leading platform that offers:
- Up-to-Date Study Guides – Aligned with the latest N10-008 exam objectives.
- Realistic Practice Exams – Simulate the actual test environment.
- Detailed Explanations – Understand why an answer is correct or incorrect.
- Interactive Learning Tools – Flashcards, quizzes, and video tutorials.
- Pass Guarantee – Confidence-backed preparation with proven results.
By using Study4Pass, you gain access to structured learning paths that make mastering IP addressing, subnetting, and network troubleshooting much easier.
Conclusion
Understanding public IP addresses is crucial for the CompTIA Network+ (N10-008) exam. The three valid public IP examples discussed (8.8.8.8, 203.0.113.45, 198.51.100.22) help clarify what makes an IP publicly routable.
For comprehensive exam preparation, Study4Pass provides the best resources, including practice tests, study notes, and expert tips to ensure you pass on your first attempt.
Start your Network+ journey today with Study4Pass and achieve certification success!
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Actual Exam Questions For CompTIA's N10-008 Certification.
Sample Questions For CompTIA N10-008 Official Exam Guide
1. Which three of the following are valid public IP addresses? (Choose three.)
A) 192.168.1.1
B) 203.0.113.5
C) 172.16.0.1
D) 8.8.8.8
E) 10.0.0.1
2. Select the three valid public IP addresses from the list below. (Choose three.)
A) 10.1.1.1
B) 255.255.255.0
C) 198.51.100.25
D) 192.168.100.50
E) 77.88.99.10
3. Which three IP addresses are considered valid public IPs? (Choose three.)
A) 172.16.200.10
B) 192.0.2.56
C) 8.8.8.8
D) 10.1.10.20
E) 128.199.25.10
4. Choose three valid public addresses from the following options. (Choose three.)
A) 192.168.50.1
B) 100.100.100.100
C) 172.30.20.1
D) 8.8.4.4
E) 127.0.0.1
5. From the following list, select three valid public IP addresses. (Choose three.)
A) 203.0.113.12
B) 10.10.0.1
C) 192.168.50.50
D) 8.8.4.4
E) 172.31.255.255