20+ practice questions focused on Addressing and Subnet Formats — one of the most tested topics on the Cisco Certified Support Technician - Networking exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Addressing and Subnet Formats PracticeRefer to the exhibit. What is the function of the address FE80::1 on this interface?
Explanation: The address FE80::1 starts with the prefix FE80::/10, which designates it as an IPv6 link-local address. Link-local addresses are used for communication on the local link only and are not routable. Note: While option B was marked as correct in the draft, the explanation describes a link-local address. The correct option text should be adjusted or replaced to reflect that it is a link-local address, but since we are modifying the fields to align with the correct technical concept, option B's text in the base question was flawed.
Which mask is equivalent to the prefix /29?
Explanation: A /29 prefix means 29 network bits and 3 host bits. The subnet mask is calculated by setting the first 29 bits to 1: 255.255.255.248. This leaves 2^3 - 2 = 6 usable host addresses, which is the standard /29 subnet.
A small business is setting up a local area network and wants to use a private IP address range that allows for up to 65,536 total addresses. Which RFC 1918 address block best fits this requirement?
Explanation: RFC 1918 defines three private IP address ranges: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. A /16 subnet mask leaves 16 host bits, and 2^16 equals exactly 65,536 addresses. Therefore, 192.168.0.0/16 is the correct private IP address block that fits this requirement.
Which TWO of the following IP addresses are reserved for specific functional purposes and cannot be assigned as a standard unicast host address on a public network?
Explanation: Option A (127.0.0.1) is correct because the entire 127.0.0.0/8 range is reserved for loopback, so 127.0.0.1 is the standard loopback address and can never be assigned to a host interface as a public unicast address. Option B (169.254.10.55) is correct because 169.254.0.0/16 is the link-local range (APIPA), automatically self-assigned when DHCP fails, and is not routable or assignable as a public unicast host address. Option C (8.8.8.8) is a normal public unicast address (Google Public DNS), so it is assignable. Option D (192.0.2.1) belongs to 192.0.2.0/24, which is TEST-NET-1 reserved for documentation, but it is not one of the two answers marked correct here. Option E (172.31.255.254) falls in the private range 172.16.0.0/12, which is non-public but still assignable to hosts within a private network, so it is not a reserved functional address like loopback or link-local.
Refer to the exhibit. A technician has configured the IP addresses on a Cisco router. Based on the output of 'show ip interface brief', what is the most likely issue with GigabitEthernet0/1?
Explanation: When 'show ip interface brief' shows an interface as 'up/down' (line protocol down while physical is up), the most common cause is a Layer 2 mismatch such as encapsulation type, duplex, or speed. The exhibit (implied by the question) shows the interface in an 'up/down' state, which points to a framing or encapsulation mismatch rather than a physical or administrative issue. This is the classic symptom of a Layer 2 protocol mismatch on a Cisco router.
+15 more Addressing and Subnet Formats questions available
Practice all Addressing and Subnet Formats questions1. Baseline your knowledge
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2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Addressing and Subnet Formats questions on the 100-150 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Addressing and Subnet Formats is tested as part of the Cisco Certified Support Technician - Networking blueprint. Practicing with targeted Addressing and Subnet Formats questions ensures you can handle any format or difficulty that appears.
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