CISSP Identity and Access Management Practice Question
An LDAP distinguished name (DN) includes the attribute 'CN=John Doe,OU=Sales,DC=company,DC=com'. What does 'CN' stand for?
⚠ Common exam trap
CISSP often tests LDAP attribute abbreviations, so the trap is confusing CN (Common Name) with C (Country Name) or assuming CN relates to certificates rather than the directory attribute.
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
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Common Name
In an LDAP distinguished name, CN stands for Common Name, which identifies the object (e.g., a user or group) by its common name attribute. In 'CN=John Doe,OU=Sales,DC=company,DC=com', CN=John Doe is the leaf RDN identifying the user. This is standard LDAP/X.500 naming.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Country Name
Why it's wrong here
The attribute 'C' is the standard X.500 and LDAP attribute type designated for representing the Country Name within a Distinguished Name (DN). In contrast, 'CN' specifically denotes the Common Name. Using 'CN' for 'Country Name' would be an incorrect application of the attribute type, as LDAP schemas strictly define the purpose and permissible values for each attribute to maintain directory integrity and interoperability.
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Common Name
Why this is correct
'CN' stands for Common Name, which is a fundamental attribute type used in LDAP Distinguished Names (DNs) to identify the most specific or common name of an entry within its immediate parent container. This attribute is widely employed for various object classes, such as users (e.g., "cn=John Doe"), groups, servers, or other resources, providing a human-readable identifier for the directory object. It forms a crucial part of the Relative Distinguished Name (RDN) for many entries.
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Certificate Name
Why it's wrong here
While digital certificates contain subject names that often utilize the 'CN' attribute (e.g., "CN=www.example.com"), 'Certificate Name' itself is not a defined or standard attribute type within the LDAP schema for constructing a Distinguished Name. LDAP DNs are used to uniquely identify entries within a directory service, such as users or devices, not to directly name or reference the certificates themselves as an attribute type in a DN component.
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Container Name
Why it's wrong here
Although LDAP directories are structured hierarchically using "containers" like Organizational Units ('OU') or Organizations ('O'), 'Container Name' is not a recognized or standard attribute type for inclusion in a Distinguished Name (DN). Attributes such as 'OU' and 'O' are specifically defined to represent organizational units and organizations, respectively, serving as the actual container attributes within the directory tree structure, unlike the generic term 'Container Name'.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official ISC2 exam blueprint
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