When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?（）

单项选择题What is a global command?（）

A.a command that is set once and affects the entire router
B.a command that is implemented in all foreign and domestic IOS versions
C.a command that is universal in application and supports all protocols
D.a command that is available in every release of IOS, regardless of the version or deployment status
E.a command that can be entered in any configuration mode

单项选择题In a switched environment, what does the IEEE 802.1Q standard describe?（）

A.the operation of VTP
B.a method of VLAN trunking
C.an approach to wireless LAN communication
D.the process for root bridge selection
E.VLAN pruning vlan

单项选择题The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on the network and subnet 0 is not being used. What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?（）

A.8
B.6
C.30
D.32
E.14
F.16

多项选择题Why do large OSPF networks use a hierarchical design?（）

A.to confine network instability to single areas of the network.
B.to reduce the complexity of router configuration
C.to speed up convergence
D.to lower costs by replacing routers with distribution layer switches
E.to decrease latency by increasing bandwidth
F.to reduce routing overhead

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