多項選擇題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


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1.單項選擇題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

5.單項選擇題You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）

A.192.168.252.8 255.255.255.248
B.192.168.252.8 255.255.255.252
C.192.168.252.16 255.255.255.240
D.192.168.252.0 255.255.255.252
E.192.168.252.16 255.255.255.252

6.單項選擇題Which command encrypts all plaintext passwords?（）

A.Router(config)#password-encryption
B.Router(config)#service password-encryption
C.Router#service password-encryption
D.Router# password-encryption

7.單項選擇題Which command enables IPv6 forwarding on a cisco router?（）

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

8.多項選擇題What are three features of the IPV6 protocol?（）

A.complicated header
B.plug-and-play
C.no broadcasts
D.checksums
E.optional IPsec
F.autoconfiguration

9.多項選擇題A network administrator needs to configure port security on a switch.which two statements are true? （）

A.The network administrator can apply port security to dynamic access ports
B.The network administrator can configure static secure or sticky secure mac addresses in the voice vlan.
C.The sticky learning feature allows the addition of dynamically learned addresses to the running configuration.
D.The network administrator can apply port security to EtherChannels.
E.When dynamic mac address learning is enabled on an interface,the switch can learn new addresses,up to the maximum defined.

10.多項選擇題Which two are advantages of static routing when compared to dynamic routing?（）

A.Security increases because only the network administrator may change the routing tables
B.Configuration complexity decreases as network size increases
C.Routing updates are automatically sent to neighbors
D.Route summarization is compued automatically by the router
E.Routing traffic load is reduced when used in stub network links
F.An efficient algorithm is used to build routing tables,using automatic updates
G.Routing tables adapt automatically to topology changes.