Which spread spectrum technology does the 802.11b standard define for operation?（）

单项选择题A cisco router is booting and has just completed the POST process.It is now ready to find and load an IOSimage.what function does the router perform next?（）

A. It checks the configuration register
B. It attempts to boot from a TFTP server
C. It loads the first image file in flash memory
D. It inspects the configuration file in NVRAM for boot instructions

单项选择题Router A is unable to reach Router B.Both routers are running ios version 12.0.After reviewing the command output and graphic,what is the most likely cause of the problem?（）

A. incorrect bandwidt h configuration
B. incorrect LMI configuration
C. incorrect map statement
D. incorrect IP address

单项选择题Which command enables IPv6 forwarding on a cisco router?（）

A. ipv6 host
B. ipv6 unicast-routing
C. ipv6 local
D. ipv6 neighbor

单项选择题In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?（）

A. 255.255.255.240
B. 255.255.255.254
C. 255.255.255.252
D. 255.255.255.0
E. 255.255.255.248

单项选择题Which IPv6 address is valid?（）

A. 2031:0:130F::9C0:876A:130B
B. 2001:0DB8:0000:130F:0000:0000:08GC:140B
C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B