Examine network topologies to understand data flows through the network.

Skill drills that exercise this task

• CSCD240-E1-A-Q14 Show the filenames containing "printf" in all .c files in home directory and subdirs.
• CSCD240-E1-A-Q29 contacts.txt has Name<tab>number lines. Print only those whose number ends with 6.
• CSCD240-E1-A-Q37 data.csv has comma-separated records. Print just the second column.
• CSCD240-E1-A-Q38 Count distinct lines in visitors.txt (unsorted input).
• CSCD240-E1-A-Q50 auth.log line format "2026-04-14 08:31 FAIL user=alex src=10.x". Print top-3 FAIL source IPs, count first, most-frequent first.
• CSCD240-E1-B-Q19 Top 5 source IPs in FAIL lines of auth.log, where IP is field 5.
• CSCD240-E1-B-Q21 Print the second column of data.csv (comma-separated).
• CSCD240-E1-C-Q15 Which pipeline counts distinct values in column 1 of a CSV?
• CSCD240-E1-C-Q44 cat access.log | grep admin | wc -l returns 0 when log has admin hits. Two reasons?