单选题To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?（）Ato a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 linkBto a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 linkCto two core switches from redundant distribution switches connected with a Layer 2 linkDto two core switches from redundant distribution switches connected with a Layer 3 linkEto two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
单选题
To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?（）
A
to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link
B
to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link
C
to two core switches from redundant distribution switches connected with a Layer 2 link
D
to two core switches from redundant distribution switches connected with a Layer 3 link
E
to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO
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问答题four switches， which one will be root switch.（no pic）.