Computer Networks - Physical and Data Link Layer
Which Python code snippet correctly filters a list
mac_list to include only MAC addresses starting with the OUI 00:1A:2B?Which Python code snippet correctly filters a list mac_list to include only MAC addresses starting with the OUI 00:1A:2B?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand filtering by OUI
OUI is the first 3 octets, so MAC addresses must start with '00:1A:2B'.Step 2: Analyze code snippets
filtered = [mac for mac in mac_list if mac.upper().startswith('00:1A:2B')] converts MAC to uppercase and checks if it starts with '00:1A:2B' correctly. filtered = [mac for mac in mac_list if '00:1A:2B' in mac] checks if substring is anywhere, which may include false positives. filtered = [mac for mac in mac_list if mac.endswith('00:1A:2B')] checks the end, which is incorrect. filtered = [mac for mac in mac_list if mac.lower().startswith('00:1a:2b:3c')] checks a longer prefix and uses lowercase but with an extra octet, so incorrect.Final Answer:
filtered = [mac for mac in mac_list if mac.upper().startswith('00:1A:2B')] -> Option CQuick Check:
Filter by startswith OUI in uppercase [OK]
Quick Trick: Use startswith with uppercase OUI to filter MACs [OK]
Common Mistakes:
MISTAKES- Checking substring anywhere instead of start
- Using endswith instead of startswith
- Mismatching case or extra octets
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