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

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

单项选择题You are working in a data center environment and are assigned the address range 10.188.31.0 23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）

A.10.188.31.0/27
B.10.188.31.0/26
C.10.188.31.0/29
D.10.188.31.0/28
E.10.188.31.0/25

单项选择题Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?（）

A.::1
B.::
C.2000::/3
D.0::/10