Question 80
An analyst is correlating suspicious domain lookups across endpoints. Which field in DNS resolver logs helps identify the internal requester?
- Client IP, DNS question and corresponding timestamp
- Only the DNS server's TLS certificate subject
- Only the top-level domain's popularity rank
- Only the resolver software's installation date
Explanation
Correct Answer
A:Requester and response details distinguish which asset made the lookup and whether the name resolved or failed.
Incorrect Answers
B:Certificate identity does not substitute for per-query client information and request timestamps.
C:Popularity enrichment may affect triage but does not attribute the query to a source host.
D:Software age gives platform context but cannot identify the endpoint responsible for a specific DNS request.
Question 81
A web analyst wants to identify which request returned an HTTP 500 error on Microsoft IIS. Which source normally supplies method, URI, and status details?
- A local ARP cache entry for the router
- Windows Security audit log-clearing records alone
- IIS W3C access logs with appropriate fields enabled
- The database user creation audit trail only
Explanation
Correct Answer
C:Request records can capture client, path, status, method, and timing, allowing correlation with application and system errors.
Incorrect Answers
A:Neighbor address mappings do not include HTTP methods, URLs, or server response codes.
B:A cleared-security-log event does not show the requested web resource or its HTTP response status.
D:Database administration logs do not directly provide IIS HTTP request-line and status metadata.
Question 82
An Apache access log contains repeated POST requests to /login with status 401 from one client. What investigation is most directly supported?
- Assume the source already has administrator privileges
- Classify the records as successful database backups
- Join the web authentication failures with identity logs
- Conclude the server's physical disk has been wiped
Explanation
Correct Answer
C:Client IP, method, path, and unauthorized responses can indicate login guessing, but a 401 alone is not proof of a malicious actor.
Incorrect Answers
A:A 401 is a denial result and does not establish a successful privileged session.
B:Repeated unauthorized POST requests are application traffic, not confirmation of database backup execution.
D:HTTP authorization failures provide no evidence of storage destruction or filesystem removal.
Question 83
A database administrator needs to know which principal executed a sensitive DELETE statement, not just whether the SQL server is reachable. What telemetry should be enabled?
- Database connection and latency monitoring without authenticated statement records
- Database auditing of statement execution and principal identity
- Application connection-pool logs that omit database statement and user details
- Periodic SQL availability checks and backup-operation audit records
Explanation
Correct Answer
B:A query audit can link SQL operations to an account, object, and time, supporting investigation of unauthorized data changes.
Incorrect Answers
A:Availability metrics show that the database is accessible or slow, but cannot establish which identity executed a specific DELETE statement.
C:Connection pools can show when sessions were opened but normally lack the audited SQL verb, target object, and execution principal required here.
D:Health checks and backup reports cannot attribute a particular sensitive DELETE operation to its initiating authenticated principal.
Question 84
An analyst must trace whether an email gateway accepted and delivered a particular phishing message. Which evidence is most useful?
- A mailbox audit record that shows the recipient opened the message after it arrived
- The current MX and SPF DNS records of the purported sender domain
- Message-tracking data including message ID and disposition
- A phishing classifier verdict with no message identifier or transport disposition
Explanation
Correct Answer
C:Transport events follow a message through mail handling stages and can differentiate rejection, quarantine, and delivery.
Incorrect Answers
A:Mailbox activity may establish user interaction after delivery but cannot explain the gateway acceptance, routing, and transport outcome for the specific message.
B:Mail-related DNS records help evaluate infrastructure and sender authorization, but they do not record whether the particular message was accepted and delivered.
D:Classification can suggest malicious content, yet without message tracking it cannot establish the acceptance, delivery, or rejection history of the message.
Question 85
Multiple endpoints were encrypted and their local event logs destroyed. Which logging design would have preserved a better investigative record?
- Disabling event generation during high CPU usage
- Relying exclusively on an administrator's recollection
- Protected near-real-time central log forwarding
- Retaining the only log copy on each affected workstation
Explanation
Correct Answer
C:Sending events off-host before the compromise limits an attacker's ability to erase all copies and supports timeline construction.
Incorrect Answers
A:Suppressing audit during stress can remove exactly the activity needed to identify destructive malware.
B:Human recollection is neither complete nor independently timestamped and cannot substitute for preserved technical events.
D:A local-only model is vulnerable when the host or its disks are destroyed, wiped, or controlled by the intruder.
Question 86
A SIEM collector currently receives syslog over UDP and loses messages during bursts. Which transport change can improve delivery reliability while keeping syslog semantics?
- Change firewall logs to plain screenshots
- Add more UDP senders without measuring packet loss
- Reduce every device's timestamps to seconds only
- Connection-oriented syslog with monitored delivery
Explanation
Correct Answer
D:TCP-based transport can provide ordered stream delivery and retransmission within the connection, though end-to-end durability still requires queueing.
Incorrect Answers
A:Images cannot replace structured streaming events and do not solve the stated packet-delivery problem.
B:Additional sources can increase bursts and congestion; they do not make UDP acknowledge or retransmit lost datagrams.
C:Lower time precision does not improve transport acknowledgements or recover dropped syslog datagrams.
Question 87
Remote network devices send logs across an untrusted intermediate network. What should the SOC require to protect log data in transit?
- A dashboard password with no transport controls
- A syslog transport secured with TLS or a comparably protected channel
- Unencrypted UDP because syslog packets are automatically private
- Only increased log retention at the destination
Explanation
Correct Answer
B:Authenticated encryption can preserve confidentiality and integrity between supported log endpoints; certificates and device support must be configured.
Incorrect Answers
A:UI authentication protects access to the console but cannot secure the log stream moving between sender and collector.
C:Plain syslog has no inherent confidentiality and can expose sensitive IP addresses, usernames, or event details on the transit path.
D:Longer storage life does not prevent observation or modification of events while they cross an untrusted link.
Question 88
Two systems appear to record an exploit five minutes apart, but the actual events occurred seconds apart. Which infrastructure issue must be checked first?
- Increase the alert correlation window to ten minutes and treat the sequence as confirmed
- Sort all events by collection arrival time while ignoring timestamps recorded at each source
- Change the SIEM dashboard to display UTC without confirming source-host clock offsets
- Clock synchronization and time-zone interpretation across data sources
Explanation
Correct Answer
D:Different clock offsets or local-time formats corrupt chronology and can make related events appear causally disconnected.
Incorrect Answers
A:A wider window may capture candidates but cannot establish true event order when the underlying sources have inconsistent clock offset or time-zone handling.
B:Collector arrival can be delayed by batching and transport, so this ordering may still misrepresent the actual sequence of exploit actions.
C:A presentation timezone does not correct a clock that was actually running minutes fast or slow; inspect source synchronization and preserve original event time.
Question 89
A high-speed transaction system emits many events within a second. Which timestamp practice is most useful when ordering correlated activity?
- High-resolution timestamps on a consistent time basis
- Assume every device's local time zone is identical
- Replace source time with the analyst's handwritten arrival time
- Convert all times to date-only values
Explanation
Correct Answer
A:Fine-grained timestamps help order closely spaced actions, but the collector must also account for clock accuracy and event delay.
Incorrect Answers
B:Ignoring zones can introduce hour-scale errors even when the underlying clocks are accurately synchronized.
C:Manual arrival notes are too coarse and discard the original event chronology and ingestion delay.
D:Removing hours and seconds makes short-lived attack sequences indistinguishable in the resulting logs.
Question 90
A firewall calls an address src_ip and an EDR uses sourceAddress. A cross-source rule fails to join them. What change addresses the mismatch?
- Force both devices to transmit their records at exactly the same second
- Raise the severity of every network event to critical
- Map both source fields into a common normalized schema
- Delete one of the data sources to remove the mismatch
Explanation
Correct Answer
C:Field normalization enables analytics to refer to one logical source-address attribute despite differing vendor formats.
Incorrect Answers
A:Time alignment alone cannot fix a rule that queries incompatible field names.
B:Severity changes do not rename fields or provide correlation across the two schemas.
D:Discarding EDR or firewall events reduces detection breadth instead of reconciling their representations.