單項選擇題Running both IPv4 and IPv6 on a router simultaneously is known as what?（）

A.4to6 routing
B.6to4 routing
C.binary routing
D.dual-stack routing
E.NextGen routing


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2.多項選擇題Which two states are the port states when RSTP has converged？（）

A.blocking
B.learning
C.disabled
D.forwarding
E.listening

3.單項選擇題A network administrator needs to force a high-performance switch that is located in the MDF to become the root bridge for a redundant path switched network. What can be done to ensure that this switch assumes the role as root bridge（）。

A.Establish a direct link from the switch to all other switches in the network.
B.Assign the switch a higher MAC address than the other switches in the network have.
C.Configure the switch so that it has a lower priority than other switches in the network.
D.Configure the switch for full-duplex operation and configure the other switches for half-duplex operation.
E.Connect the switch directly to the MDF router, which will force the switch to assume the role of root bridge.

4.單項選擇題

Host1的用戶想PING DSL調(diào)制解調(diào)器/路由器的192.168.1.254，ARP表如下圖，Host1會怎么操作？（）

A.發(fā)送一個單播ARP包到DSL調(diào)制解調(diào)器/路由器
B.發(fā)送一個單播ICMP包到DSL調(diào)制解調(diào)器/路由器
C.發(fā)送三層廣播包到響應的DSL調(diào)制解調(diào)器/路由器
D.發(fā)送一個可以被Host2，the switch，and the DSL modem/router 受到的2層廣播幀

5.單項選擇題A medium-sized company has a Class C IP address. It has two Cisco routers and one non-Cisco router. All three routers are using RIP version 1. The company network is using the block of 198.133.219.0/24. The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM. What is the best course of action if the company wants to have 40 hosts in each of the three subnets?（）

A.Convert all the routers to EIGRP and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.
B.Maintain the use of RIP version 1 and use 198.133.219.32/27, 198.133.219.64/27, and 133.219.92/27 as the new subnetworks.
C.Convert all the routers to EIGRP and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.
D.Convert all the routers to RIP version 2 and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.
E.Convert all the routers to OSPF and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
F.Convert all the routers to static routes and use 198.133.219.16/28, 198.133.219.32/28, and

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