A network uses MAC address filtering to allow only devices from two manufacturers with OUIs 00:1A:2B and 00:1B:3C. Which Python code snippet correctly filters a list of MAC addresses named mac_list?
hard📝 Application Q9 of 15
Computer Networks - Physical and Data Link Layer
A network uses MAC address filtering to allow only devices from two manufacturers with OUIs 00:1A:2B and 00:1B:3C. Which Python code snippet correctly filters a list of MAC addresses named mac_list?
Afiltered = [mac for mac in mac_list if mac.endswith(('00:1A:2B', '00:1B:3C'))]
Bfiltered = [mac for mac in mac_list if mac.startswith(('00:1A:2B', '00:1B:3C'))]
Cfiltered = [mac for mac in mac_list if '00:1A:2B' in mac or '00:1B:3C' in mac]
Dfiltered = [mac for mac in mac_list if mac == '00:1A:2B' or mac == '00:1B:3C']
Step-by-Step Solution
Solution:
Step 1: Understand filtering by OUI
Filtering requires checking if MAC addresses start with either OUI string.
Step 2: Analyze code options
filtered = [mac for mac in mac_list if mac.startswith(('00:1A:2B', '00:1B:3C'))] uses startswith with a tuple, correctly filtering by OUI prefixes. filtered = [mac for mac in mac_list if mac.endswith(('00:1A:2B', '00:1B:3C'))] checks suffixes, which is incorrect. filtered = [mac for mac in mac_list if '00:1A:2B' in mac or '00:1B:3C' in mac] checks anywhere in string, which may cause false positives. filtered = [mac for mac in mac_list if mac == '00:1A:2B' or mac == '00:1B:3C'] checks exact match, which is too strict.
Final Answer:
filtered = [mac for mac in mac_list if mac.startswith(('00:1A:2B', '00:1B:3C'))] -> Option B
Quick Check:
Use startswith to filter by OUI prefixes [OK]
Quick Trick:Use startswith() with OUI tuple to filter MAC addresses [OK]
Common Mistakes:
MISTAKES
Using endswith instead of startswith
Checking substring anywhere in MAC
Comparing full MAC to OUI only
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