Private vs public IP addresses in Computer Networks - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to identify the type of IP address used within a home network.

Computer Networks

A private IP address is typically assigned to devices [1] a local network.

Drag options to blanks, or click blank then click option'

Arandomly

Boutside

Cinside

Dglobally

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing private IPs with public IPs

Thinking private IPs are assigned globally

Private IP addresses are used inside local networks, like your home or office, to identify devices.

2fill in blank

medium

Complete the sentence to explain where public IP addresses are used.

Computer Networks

A public IP address is assigned to a device [1] the internet to allow communication globally.

Drag options to blanks, or click blank then click option'

Aon

Bunder

Coutside

Dinside

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'inside' or 'under' which don't fit the context

Confusing public IPs with private IPs

Public IP addresses are assigned to devices on the internet so they can communicate with other devices worldwide.

3fill in blank

hard

Fix the error in the statement about private IP address ranges.

Computer Networks

The IP range 192.168.0.0 to 192.168.255.255 is a [1] IP address range.

Drag options to blanks, or click blank then click option'

Aprivate

Bpublic

Cdynamic

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing private with public ranges

Thinking this range is dynamic or static by default

The range 192.168.0.0 to 192.168.255.255 is reserved for private IP addresses used within local networks.

4fill in blank

hard

Fill both blanks to complete the explanation about IP address visibility.

Computer Networks

Devices with a [1] IP address can be accessed [2] the internet, while those with a private IP cannot.

Drag options to blanks, or click blank then click option'

Apublic

Bprivately

Cover

Dlocally

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'privately' and 'locally' with 'over' internet

Choosing 'private' instead of 'public' for the first blank

Public IP addresses allow devices to be accessed over the internet, unlike private IP addresses which are only accessible locally.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension that maps IP types to their typical usage.

Computer Networks

ip_usage = [1]: 'Used within local networks', [2]: 'Assigned by ISP for internet access' for [3] in ['private', 'public']

Drag options to blanks, or click blank then click option'

A'private'

B'public'

Cip_type

Ddevice

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'device' instead of 'ip_type' as loop variable

Swapping 'private' and 'public' keys

Using unquoted keys

This dictionary comprehension creates a mapping where 'private' IPs are used locally and 'public' IPs are assigned by ISPs for internet access. The variable 'ip_type' iterates over the list.

Practice

1. Which of the following IP address ranges is reserved for private networks?

easy

A. 192.168.0.0 to 192.168.255.255

B. 8.8.8.8 to 8.8.8.255

C. 172.32.0.0 to 172.47.255.255

D. 1.1.1.1 to 1.1.1.255

Solution

1. Step 1: Identify private IP ranges

   Private IP addresses include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 ranges.

2. Step 2: Match given options to private ranges

   A and B are public ranges. C (172.32.0.0 to 172.47.255.255) is outside the private 172.16.0.0/12 range. D matches the private 192.168.0.0/16 range.

3. Final Answer:

   192.168.0.0 to 192.168.255.255 -> Option A

4. Quick Check:

   Private IP range = 192.168.x.x [OK]

Hint: Private IPs start with 10., 172.16-31., or 192.168. [OK]

Common Mistakes:

• Confusing public IPs like 8.8.8.8 as private
• Not knowing the specific private IP ranges
• Assuming all IPs starting with 1 or 8 are private

2. Which of the following is a valid public IP address?

easy

A. 192.168.1.1

B. 8.8.8.8

C. 172.20.10.5

D. 10.0.0.1

Solution

1. Step 1: Identify private IP addresses

   10.0.0.1, 192.168.1.1, and 172.20.10.5 are all within private IP ranges.

2. Step 2: Check which IP is outside private ranges

   8.8.8.8 is a public IP address used by Google DNS servers.

3. Final Answer:

   8.8.8.8 -> Option B

4. Quick Check:

   Public IP example = 8.8.8.8 [OK]

Hint: Public IPs are not in private ranges like 10., 172.16-31., 192.168. [OK]

Common Mistakes:

• Choosing private IPs as public by mistake
• Not recognizing common public IPs like 8.8.8.8
• Assuming all IPs starting with low numbers are private

3. Consider a device with IP address 192.168.1.10. What type of IP address is this?

medium

A. Loopback IP address

B. Public IP address

C. Broadcast IP address

D. Private IP address

Solution

1. Step 1: Identify the IP address range

   192.168.1.10 falls within the 192.168.0.0 to 192.168.255.255 range, which is reserved for private networks.

2. Step 2: Understand IP address types

   Private IPs are used inside local networks and are not routable on the internet. This matches the given IP.

3. Final Answer:

   Private IP address -> Option D

4. Quick Check:

   192.168.x.x = Private IP [OK]

Hint: 192.168.x.x always means private IP [OK]

Common Mistakes:

• Confusing private IP with public IP
• Thinking 192.168.x.x is loopback or broadcast
• Not knowing IP address classifications

4. A network administrator assigns the IP address 172.32.0.1 to a device. What is the issue with this assignment?

medium

A. 172.32.0.1 is outside the private IP range and should be public

B. 172.32.0.1 is a loopback address and cannot be assigned to devices

C. 172.32.0.1 is a private IP address and cannot be used publicly

D. 172.32.0.1 is a broadcast address and cannot be assigned

Solution

1. Step 1: Check the private IP range for 172.x.x.x

   The private range for 172 is from 172.16.0.0 to 172.31.255.255. The IP 172.32.0.1 is just outside this range.

2. Step 2: Understand implications of IP outside private range

   Since 172.32.0.1 is outside the private range, it is considered a public IP and must be assigned carefully to avoid conflicts.

3. Final Answer:

   172.32.0.1 is outside the private IP range and should be public -> Option A

4. Quick Check:

   172.16-31.x.x = Private, 172.32.x.x = Public [OK]

Hint: 172.16 to 172.31 is private; 172.32 is public [OK]

Common Mistakes:

• Assuming all 172.x.x.x are private
• Confusing broadcast or loopback with this IP
• Not checking exact private IP range boundaries

5. You want to set up a home network that connects multiple devices but does not expose them directly to the internet. Which IP address type should you use and why?

hard

A. Public IP addresses, because they allow direct internet access

B. Broadcast IP addresses, because they send data to all devices

C. Private IP addresses, because they keep devices hidden from the internet

D. Loopback IP addresses, because they test network connections

Solution

1. Step 1: Understand the purpose of private IP addresses

   Private IPs are used inside local networks to allow devices to communicate without being directly visible on the internet.

2. Step 2: Match network setup needs to IP type

   For a home network that should not expose devices directly, private IP addresses are ideal to provide local connectivity and security.

3. Final Answer:

   Private IP addresses, because they keep devices hidden from the internet -> Option C

4. Quick Check:

   Home networks use private IPs for local security [OK]

Hint: Use private IPs for local networks hidden from internet [OK]

Common Mistakes:

• Choosing public IPs and risking exposure
• Confusing broadcast or loopback IPs with usable device IPs
• Not understanding network security basics