Which routing protocol supports a flexible area structure using routing levels one and two?（）

单项选择题Which site-to-site VPN solution allows Cisco routers, PIX Firewalls, and Cisco hardware clients to act as remote VPN clients in order to receive predefined security policies and configuration parameters from the VPN headend at the central site?（）

A. Easy VPN
B. GRE tunneling
C. Virtual Tunnel Interfaces
D. DynamicMultipoint VPN
E. Group Encrypted Transport VPN

单项选择题When designing the WAN module within the enterprise edge, which document is used to specify the connectivity and performance agreements with the service provider?（）

A.RFP
B.RFC
C.SLC/SLA
D.SOW

单项选择题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

单项选择题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)

单项选择题In a VoWLAN deployment, It is recommended（）dBm separation between cells with the same channel.

A.6
B.7
C.10
D.19