單項(xiàng)選擇題You are the network consultant from Cisco.com. Please point out the reason that STP required when VLANs do not span access layer switches.（）

A. ensure a loop-free topology
B. protect against user-side loops
C. support business applications
D. risk of lost connectivity without STP


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1.單項(xiàng)選擇題Acme Nutrition manufactures a wide variety of vitamin supplements. It has a single manufacturing facility with 3 regional warehouses and 16 district sales offices. Currently the manufacturing facility requires 210 IP addresses; each warehouse requires 51 IP addresses; each district sales office requires 11 IP addresses; and the IP WAN requires 38 IP addresses. if Acme Nutrition plans for 20 percent growth in facilities, how many Class C subnets will the district sales offices require?（）

A. 19 (3 from the warehouse range and 16 from a separate Class C address)
B. 19 (3 from the warehouse block, 15 from a separate Class C block and 1 from the IP WAN block)
C. 20 (4 from the warehouse range,15 from a separate Class C block and 1 from the IP WAN block)
D. 16 (3 from the warehouse range and 13 from a separate Class C address)

4.單項(xiàng)選擇題The Cisco network-based virtual firewall service solution helps service providers to deliver costeffective, scalable, integrated security services for enterprise customers using Cisco platforms .What is a virtual firewall?（）

A. another name for a firewall deployed in routed mode
B. another name for a firewall deployed in transparent mode
C. a separation of multiple firewall security contexts on a single firewall
D. a firewall that, when deployed in routed mode, can support up to 1000 VLANs per context

5.單項(xiàng)選擇題Which protocol would provide block access to remote storage over WAN links?（）

A.iSCSI
B.FCIP
C.SCSI-FP
D.eSCSI