Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?（）

单项选择题What is the most likely reason for the dispartly between the actual network numbers at the branches and the routes in the routing table on Gateway-Router?（）

A. Branch-Router2 is configured to send both RIPv1 and RIPv2 updates.
B. Gateway-Router is configured to only receive RIPv2 updates.
C. Gateway-router is configured to receive only RIPv1 updates.
D. Branch-Router1 is configured to only send RIPv1 updates

单项选择题which address range efficiently summarizes the routing table of the addresses for router main?（）

A. 172.16.0.0/18
B. 172.16.0.0/16
C. 172.16.0.0/20
D. 172.16.0.0/21

单项选择题assuming the default switch configuration which vlan range can be added modified and removed on a cisco switch?（）

A. 2 through 1001
B. 1 through 1001
C. 1 through 1002
D. 2 through 1005

单项选择题which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）

A. (config-if)#authentication ppp chap fallback ppp
B. (config-if)#authentication ppp chap pap
C. (config-if)#ppp authentication chap pap
D. (config-if)#ppp authentication chap fallback ppp

单项选择题Which parameter or parameters are used to calculate OSPF cost in cisco routers?（）

A. Bandwidth,Delay,and MTU
B. Bandwidth
C. Bandwidth and MTU
D. Bandwidth , MTU,Reliability,Delay,and Load