This SNOW-CSA practice question tests your understanding of database administration and cmdb. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO attributes are essential for identifying configuration items in the CMDB to ensure uniqueness? (Choose exactly 2.)
MAC address
Network interface MAC addresses are globally unique.
Asset tag
Why wrong: Asset tags may not be assigned to all CIs, e.g., software.
Name
Why wrong: Name may not be unique; could be hostname, often not unique.
Serial number
Typically unique per device.
IP address
Why wrong: IP addresses can change or be shared (NAT).
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
MAC address
Option A (MAC address) is correct because a MAC address is a globally unique hardware identifier assigned to network interfaces by the manufacturer, making it a reliable and immutable attribute for uniquely identifying configuration items (CIs) such as servers, switches, and workstations in the CMDB. In ServiceNow, the MAC address is often used as a deduplication key to prevent duplicate CIs, especially when discovered via network probes or agents. Its uniqueness is guaranteed at the hardware level, unlike attributes that can be changed or reassigned.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
MAC address
Why this is correct
Network interface MAC addresses are globally unique.
Related concept
Read the scenario before looking for a memorised answer.
Asset tag
Why it's wrong here
Asset tags may not be assigned to all CIs, e.g., software.
Name
Why it's wrong here
Name may not be unique; could be hostname, often not unique.
Serial number
Why this is correct
Typically unique per device.
Related concept
Read the scenario before looking for a memorised answer.
IP address
Why it's wrong here
IP addresses can change or be shared (NAT).
Common exam traps
The trap here is that candidates often confuse 'uniqueness' with 'common usage' and select IP address or name because they are frequently used in daily operations, but the exam specifically tests the understanding that MAC addresses and serial numbers are hardware-level, immutable identifiers that guarantee uniqueness across the entire CMDB.
Detailed technical explanation
Under the hood, ServiceNow’s CMDB uses the MAC address as a primary deduplication field in the Identification and Reconciliation Engine (IRE), which matches discovered CIs against existing records based on a set of identification rules. For example, when a network switch is discovered via SNMP, its MAC address is compared against the cmdb_ci_switch table to avoid creating a duplicate. In real-world scenarios, a server with multiple NICs will have multiple MAC addresses, but the CMDB typically uses the first discovered or primary MAC for identification, and the IRE can be configured to use a combination of MAC and serial number for higher accuracy.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the SNOW-CSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Database Administration and CMDB — This question tests Database Administration and CMDB — Read the scenario before looking for a memorised answer..
The correct answer is: MAC address — Option A (MAC address) is correct because a MAC address is a globally unique hardware identifier assigned to network interfaces by the manufacturer, making it a reliable and immutable attribute for uniquely identifying configuration items (CIs) such as servers, switches, and workstations in the CMDB. In ServiceNow, the MAC address is often used as a deduplication key to prevent duplicate CIs, especially when discovered via network probes or agents. Its uniqueness is guaranteed at the hardware level, unlike attributes that can be changed or reassigned.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This SNOW-CSA practice question is part of Courseiva's free ServiceNow 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 SNOW-CSA exam.
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