单项选择题

Why is STP required when VLANs span access layer switches?（）

A. to ensure a loop-free topology
B. to protect against user-side loops
C. in order to support business applications
D. because of the risk of lost connectivity without STP
E. for the most deterministic and highly available network topology

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单项选择题

When is a first-hop redundancy protocol needed in the distribution layer?（）

A. when HSRP is not supported by the design
B. when multiple vendor devices need to be supported
C. when preempt tuning of the default gateway is needed
D. when a robust method of backing up the default gateway is needed
E. when the design implements Layer 2 between the access switch and the distribution switch
F. when the design implements Layer 3 between the access switch and the distribution switch

单项选择题

Which of these recommended designs provides the highest availability?（）

A. map the Layer 2 VLAN number to the Layer 3 subnet
B. control route propagation to edge switches using distribute lists
C. use a Layer 2 distribution interconnection link with HSRP or GLBP
D. use a Layer 3 distribution interconnection link with HSRP or GLBP
E. use equal-cost Layer 3 load balancing on all links to limit the scope of queries in EIGRP