Question 140
A microservice must verify the identity of an internal database proxy, and the proxy must verify the calling workload. Which TLS design meets both needs?
- Disabling certificate revocation checks without replacement controls
- Mutual TLS with validated client and server certificates
- Plain TCP over a private network without authentication
- Server-only TLS plus anonymous workload access
Explanation
Correct Answer
B:mTLS authenticates both ends of the connection and encrypts traffic, allowing policy to bind a workload identity to database access.
Incorrect Answers
A:Avoiding revocation awareness weakens management of compromised identities and does not add client authentication.
C:Private addresses do not prevent interception or compromised internal processes from impersonating callers.
D:Server authentication secures destination identity but does not by itself authenticate individual calling microservices.
Question 141
A sender's SMTP server opportunistically upgrades to STARTTLS, but the recipient domain does not require encrypted transport. What is the important limitation?
- STARTTLS automatically prevents recipients from forwarding messages
- Opportunistic TLS can fall back unless stronger enforcement is configured
- STARTTLS always encrypts messages after delivery to the inbox
- STARTTLS proves that the human sender wrote the message
Explanation
Correct Answer
B:Without authenticated transport policies, interception or downgrade conditions can lead to delivery without guaranteed encryption.
Incorrect Answers
A:Transport encryption does not control how a recipient handles plaintext after delivery.
C:SMTP transport encryption protects a hop, not necessarily data at rest or every subsequent mail transport step.
D:Channel security between servers is not an end-user digital signature verifying authorship of mail content.
Question 142
A legal team wants sensitive attachments readable only by specified recipients, including after transport servers handle the email. Which protection is most relevant?
- Add a plain-text confidentiality disclaimer
- Disable recipient certificate verification
- Rely exclusively on SMTP TLS between the first two servers
- End-to-end message encryption such as S/MIME when deployed correctly
Explanation
Correct Answer
D:Message-layer encryption targets recipient-held keys, preserving confidentiality beyond individual SMTP transport hops.
Incorrect Answers
A:A notice may communicate handling expectations but offers no cryptographic barrier to unauthorized reading.
B:Failing to verify recipient keys can permit encryption to an impostor, defeating the required recipient-only confidentiality.
C:Hop encryption can terminate at intermediate servers, leaving the message content available to mail infrastructure along the path.
Question 143
A production analytics system must process customer records without exposing actual national identifiers to most analysts. Which technique fits?
- Encrypt the server's network interface description
- Copy raw identifiers into every analyst's local notebook
- Tokenize identifiers and restrict access to the token vault
- Retain identifiers in publicly accessible dashboards
Explanation
Correct Answer
C:Replacing identifiers with nonsemantic tokens permits approved processing while isolating the lookup mechanism that restores originals.
Incorrect Answers
A:Interface labels do not control the values revealed to analysts in query results or analytics extracts.
B:Replication multiplies exposed copies and undermines the requirement to avoid direct identifier disclosure.
D:Publishing raw regulated identifiers makes data minimization and least-privilege objectives impossible to satisfy.
Question 144
Developers need realistic-looking customer records in a test environment but must not expose production personal details. Which practice best fits?
- Set the test database name to 'anonymous'
- Disable database access logs to reduce privacy risk
- Reuse unredacted production dumps because the environment is internal
- Mask or synthesize sensitive fields before test-data distribution
Explanation
Correct Answer
D:Consistent masking or synthetic generation preserves useful formats while preventing routine developers from reading real identifiers.
Incorrect Answers
A:Naming alone does not remove personal values from records or limit who can inspect them.
B:Eliminating audit evidence does not anonymize data and can conceal improper access to test datasets.
C:Internal access still creates unnecessary privacy and security risk when test users do not need genuine customer records.
Question 145
A security team needs to prevent sensitive files from being sent to unauthorized external email domains. Which type of technology directly examines content and destinations?
- A DHCP lease-duration setting
- Data loss prevention integrated with email handling
- A RAID stripe-size change
- A router's interface description
Explanation
Correct Answer
B:DLP rules can classify sensitive content and block, quarantine, or alert on transfers that violate sharing policy.
Incorrect Answers
A:Address assignment timing does not inspect email attachments or prevent specific data categories from leaving the organization.
C:Storage layout influences performance and resilience, not email content classification or exfiltration prevention.
D:Administrative labels do not classify document content or determine whether a destination domain is permitted.
Question 146
A ransomware group modifies production files and attempts to encrypt connected backups. What backup property most directly helps recovery?
- Immutable or otherwise write-protected recovery copies
- Snapshots on the same writable production datastore
- Backups stored solely on a permanently writable network share
- Increased file compression ratio without version separation
- Documentation claiming backups exist without restore tests
Explanation
Correct Answer
A:Backups that attackers cannot readily alter or delete during their retention window preserve a viable recovery point after compromise.
Incorrect Answers
B:Storage-local snapshots can be deleted or encrypted by an attacker with datastore access, so they may not survive a shared compromise.
C:An attacker with broad credentials may encrypt or delete the same share, undermining the intended recovery safety net.
D:Space savings do not prevent malicious modification or guarantee an unaffected historical recovery point.
E:Untested claims do not establish that data can be recovered intact and within required business timelines.
Question 147
A policy requires three data copies on two types of media, with one held offsite. Which backup design principle is being applied?
- The 3-2-1 backup rule
- A single mirrored volume in one chassis
- Encrypting a single online backup without another copy
- A database index rebuild schedule
Explanation
Correct Answer
A:Multiple independent copies across media and locations reduce correlated loss from local failures or site-wide disasters.
Incorrect Answers
B:Mirroring adds local availability but does not create independent media and offsite copies against common-site loss.
C:Encryption helps confidentiality but still leaves one failure or attacker-access domain for the only backup set.
D:Index maintenance can improve query performance but does not create geographically independent recovery copies.
Question 148
An encrypted SSD is being retired, and the organization can securely invalidate all keys that protect its stored data. Which disposal technique applies?
- Copying the encrypted data to a second unmanaged disk
- Cryptographic erasure with verified key destruction
- Changing the SSD volume label
- Ordinary deletion of filesystem directory entries
Explanation
Correct Answer
B:Proper destruction of the encryption keys renders protected ciphertext inaccessible without requiring a full physical overwrite of SSD cells.
Incorrect Answers
A:Duplication increases the number of exposed copies rather than reliably sanitizing the retired device.
C:A label is metadata visible to users and does not affect the ability to decrypt protected contents.
D:Deleting directory metadata may leave data blocks and keys recoverable from the medium.
Question 149
A retention schedule says audit records can be destroyed after two years, but litigation counsel issues a preservation hold. Which action is correct?
- Suspend normal deletion for affected records until the hold is released
- Delete records immediately when their ordinary retention age is reached
- Transfer held records to an untracked public folder
- Turn off all future logs to reduce storage consumption
Explanation
Correct Answer
A:A legal hold overrides routine destruction for in-scope evidence and requires traceable preservation and access control.
Incorrect Answers
B:Routine disposal would risk destroying information subject to a valid preservation requirement.
C:A public folder undermines custody, confidentiality, and integrity expectations for preserved evidence.
D:Disabling logging can compromise incident evidence and does not resolve what must be preserved under the hold.
Question 150
An encryption service needs to replace a compromised data-encryption key without placing master keys in application source code. Which architecture best supports controlled rotation?
- Envelope encryption using centrally managed key-encryption keys
- Replace encryption with reversible text encoding
- Publish recovery keys in a common configuration repository
- Hard-code one shared plaintext key into every application binary
Explanation
Correct Answer
A:Separating data keys from managed wrapping keys reduces direct master-key exposure and supports rotation with auditable key management.
Incorrect Answers
B:Encoding does not provide confidentiality and can be undone by any reader familiar with the transformation.
C:Broad key distribution increases unauthorized decryption risk instead of restricting sensitive key material.
D:Embedded long-lived secrets are difficult to rotate safely and can expose all data when one program artifact leaks.