Which three functions are key characteristics of the data center access layer in a three-tier architecture? (Choose three.) 

Answer options:

A. must support routing protocols such as OSPF and BGP
B. provides connectivity to network based services (load balancer and firewall)
C. segment workgroups
D. implement in top-of-rack or end-of-row topology
E. provides connectivity to the servers
F. performs QoS marking DEF

Explanation