multiple_choice
medium
Remember
signals
2 points
Question 8. CSCD240-E1-C
Which signal cannot be caught, blocked, or ignored?
Work the drill
Answer on paper or in a terminal before revealing the ideal answer.
Ideal answer
C: SIGKILL (9)
Misconception bank
Each row below is a plausible wrong answer, the thinking that produces it, and the remedy that corrects the misconception. These are the foundation of the multiple-choice framing and the targeted feedback a student receives after answering.
A: SIGTERM (15)
Misconception. Default kill signal; CATCHABLE.
Remedy. SIGTERM is polite; SIGKILL is unstoppable.
B: SIGINT (2)
Misconception. Ctrl-C; catchable.
Remedy. Any trap handler can catch SIGINT.
D: SIGHUP (1)
Misconception. Can be caught; often used to reload config.
Remedy. Daemons trap SIGHUP to re-read config.
Authority mappings
Hover any chip for the mapping justification; click to open the authority record.
DCWF roles:
CE-463 Host Analyst
DCWF tasks:
T0501
KU outcomes:
CO-M3-O3
O*NET tasks:
SOC 15-1231.00: task 12SOC 15-1231.00: task 13SOC 15-1244.00: task 1SOC 15-1244.00: task 2
NCAE errors:
Postgres Access / failure: An error was encounter.WWW Port 80 / failure: Failed to connect to serve.SMB Login / failure: SMB operation failed: [Errno.SSH Login / failure: Failed to connect to host: IPSMB Login / failure: SMB operation failed: [Errno.SMB Login / failure: SMB connection failed: proto.SSH Login / partial: The following users failed t.SSH Login / partial: The following users failed t.WWW Port 80 / failure: HTTP not found
Course-artifact links
Lectures
- CSCD240-S26-L08. Pipes, filters, grep, sort, uniq, wc, tar
Lab questions
- CSCD240-S26-LAB6: Start a command, kill with default signal; start again, kill -9.