
Explanation/Reference:
Changed this one to Jolly Frogs suggestion from Actual Tests:
Access:
Protect against inadvertent loops
Protect network services including DHCP, ARP, and IP spoofing protection
Distribution:
Protect the endpoints using network-based intrusion prevention
Protect the infrastructure using NFP best practices
Core:
Filter and rate-limit control plane traffic
Does not perform security functions to mitigate transit threats
Explanation:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/SAFE_RG/chap5.html#wp1090913
http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/SAFE_RG/chap3.html
1 Access
2 Distribution
3 Access
4 Core
5 Access
6 Distribution
Please refer to link.
Link: http://www.ciscopress.com/articles/article.asp?p=1073230&seqNum=2