<{p}>In a three-tier hierarchical campus network design, which action is a design best-practice for the core layer?<{/p}>

【单选题】
A <{p}>provide QoS prioritization services such as marking, queueing, and classification for critical network traffic.<{/p}>
B <{p}>provide redundant Layer 3 point-to-point links between the core devices for more predictable and faster convergence<{/p}>
C <{p}>provide advanced network security features such as 802.1X. DHCP snooping, VACLs, and port<{/p}>
D <{p}>provide redundant aggregation for access layer devices and first-hop redundancy protocols such as<{br/}>VRRP<{/p}><{p}><{/p}>

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