Wildcard Certificates for Multi-Subdomain Cost Efficiency

SY0-701 By islever Editorial Last updated

Explain the importance of using appropriate cryptographic solutions.

Short answer

A Implement wildcard certificates to secure a domain and all its subdomains with a single certificate, reducing cost and management overhead.

Question

A security administrator is working to find a cost-effective solution to implement certificates for a large number of domains and subdomains owned by the company. Which of the following types of certificates should the administrator implement?
  1. Wildcard Correct Answer
  2. Client certificate
  3. Self-signed
  4. Code signing

Key Takeaways

Tests knowledge of SSL/TLS certificate types, specifically identifying wildcard certificates as the optimal choice for securing numerous subdomains under one primary domain name.

Wildcard certificates secure a domain and all its subdomains with a single certificate, providing a cost-effective solution for managing multiple domains.

Common mistake: Learners often confuse wildcard certificates with self-signed certificates, mistakenly choosing self-signed to save costs despite ignoring the critical requirement for trusted public validation in most enterprise scenarios.

Expert Analysis

Why the Answer Is Correct

A wildcard certificate is designed to secure a base domain and an unlimited number of subdomains (e.g., *.example.com covers mail.example.com, www.example.com, etc.). This makes it the most cost-effective option for a company owning many subdomains, as only one certificate purchase and management cycle are required instead of individual ones for each subdomain.

Why the Other Options Are Wrong

Self-signed certificates (C) are free but not trusted by default by browsers or clients, requiring manual distribution and trust establishment, which is impractical for large-scale public-facing services. Code signing certificates (D) are used to verify the identity of software publishers, not to encrypt web traffic. Client certificates (B) authenticate users to servers, not the server's identity to clients.

Community Comment Notes

The majority of voters correctly identified Wildcard certificates due to their ability to cover multiple subdomains efficiently. One user raised a concern about the plural 'domains' in the question, suggesting that if multiple distinct root domains were involved, wildcard certificates might not be cost-effective without buying multiple wildcards. However, in certification exam contexts, 'domains and subdomains' typically implies a hierarchy under a single registered domain where wildcards are standard practice. Another commenter incorrectly defined 'wildcard' as a file search pattern, confusing the computing term with the cryptographic context.

Exam Strategy

When a question mentions 'cost-effective' and 'multiple subdomains', immediately consider wildcard certificates. Always distinguish between securing a single domain (standard SSL), multiple subdomains of one domain (wildcard), and multiple distinct domains (SAN/UCC).

Frequently Asked Questions

Why not use Self-Signed certificates to save money?

Self-signed certs are not trusted by clients/browsers by default, causing security warnings. They require manual trust installation on every device, which is unscalable for large enterprises.

What if the company owns multiple distinct root domains?

If multiple distinct root domains are needed, a Single Wildcard won't work. You would need either multiple wildcard certificates or a Subject Alternative Name (SAN) certificate.

More SY0-701 FAQ →

Community Votes

A
100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 6 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 6

  1. ProudFather 👍 3 Answered A
    A wildcard certificate can be used to secure multiple subdomains under a single domain name. This makes it a cost-effective solution for organizations with a large number of subdomains. By purchasing a single wildcard certificate, the organization can secure all subdomains with a single certificate, reducing the need for multiple individual certificates.
  2. baronvon 👍 2 Answered A
    A. Wildcard Wildcard certificates allow you to secure a domain and all of its subdomains with a single certificate. This can be a cost-effective solution for managing certificates for a large number of domains and subdomains.
  3. scholi 👍 1
    A wildcard is a character or symbol used in computing to represent one or more characters in a string, allowing for flexible searching, matching, and filtering. Wildcards are commonly used in various contexts such as file searching, pattern matching, and access control. Wildcards are used to search for files or directories that match a certain pattern.
  4. scholi 👍 1
    Wildcards are used to search for files or directories that match a certain pattern. (Asterisk): Represents zero or more characters. Example: .txt matches all files with a .txt extension. ? (Question Mark): Represents exactly one character. Example: file?.doc matches file1.doc, fileA.doc, etc.
  5. f59f364 👍 1 Answered C
    Not sure about wildcard. It can service one domain, and question says "domainS". If you by multiple wildcard certificates, it is not cost effective. I will go with C, self-signed, it doesn't say that service using certificate is public.
Show 1 more comment
  1. AndyK2 👍 1 Answered A
    Covers multiple subdomains with single certificate Cost-effective for large number of domains

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