JN0-106 Networking Fundamentals Practice Question
Which TWO statements about IPv4 addressing are correct?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The network 169.254.0.0/16 is used for link-local addressing.
Option B is correct because 169.254.0.0/16 is the APIPA (Automatic Private IP Addressing) range, reserved for link-local addressing when a host cannot obtain an address via DHCP. Option E is correct because 127.0.0.1 falls within the 127.0.0.0/8 loopback range, used by a host to send traffic to itself for testing the TCP/IP stack. Option A is incorrect because a /24 mask yields 256 total addresses but only 254 usable host addresses, since the network and broadcast addresses are reserved. Option C is incorrect because 192.168.0.0/16 is part of the private RFC 1918 range, not a public address. Option D is incorrect because 10.0.0.0/8 is also an RFC 1918 private address block, not publicly routable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A /24 subnet mask provides 256 usable host addresses.
Why it's wrong here
A /24 subnet mask (255.255.255.0) creates a block of 256 IPv4 addresses in total, but the first address is the network identifier and the last is the directed broadcast address. Therefore only 254 addresses are actually usable for assigning to hosts. The statement incorrectly treats the entire 256-address block as usable, which would cause address planning errors.
- ✓
The network 169.254.0.0/16 is used for link-local addressing.
Why this is correct
The 169.254.0.0/16 range is reserved for link-local addressing per RFC 3927. Devices automatically assign themselves an address in this range when they fail to obtain one from a DHCP server, enabling communication only within the local subnet. These addresses are not routable on the internet, and packets destined to them are confined to the local link.
- ✗
The address 192.168.0.0/16 is a public address.
Why it's wrong here
192.168.0.0/16 is one of the three private IPv4 address blocks defined in RFC 1918, along with 10.0.0.0/8 and 172.16.0.0/12. Addresses in this range are intended for use within private networks and are not globally routable; they must be translated via NAT to access the public internet. Therefore calling it a public address is incorrect.
- ✗
The address 10.0.0.0/8 is a public address.
Why it's wrong here
The 10.0.0.0/8 block is the largest private address space defined in RFC 1918, covering over 16 million addresses. Because it is private, it is not assigned to any organization for public use and cannot be routed on the internet; it is commonly used internal network addressing. The statement that it is public is incorrect.
- ✓
The address 127.0.0.1 is a loopback address.
Why this is correct
The entire 127.0.0.0/8 range is reserved for loopback addressing, and 127.0.0.1 is the standard loopback address on virtually every host. Packets addressed to 127.0.0.1 are looped back within the sending device and never leave the network interface. This allows local testing of IP stack functionality without external network connectivity.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JN0-106 exam.