SSCP Access Controls Practice Question
A company is implementing single sign-on (SSO) for its internal applications. Which TWO of the following protocols are commonly used for SSO?
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
✓
Kerberos
Kerberos and SAML are both widely used for SSO. Kerberos is common in Windows domains, while SAML is used for web-based federated SSO. LDAP is a directory protocol, OAuth is for authorization (though OIDC adds authentication), and RADIUS is for network access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Kerberos
Why this is correct
Kerberos provides SSO within a domain.
- ✗
OAuth
Why it's wrong here
OAuth is for authorization, not authentication by itself.
- ✗
LDAP
Why it's wrong here
LDAP is a directory access protocol, not SSO.
- ✗
RADIUS
Why it's wrong here
RADIUS is for network authentication, not SSO.
- ✓
SAML
Why this is correct
SAML is a federated SSO protocol.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.