有一食品店某天购进了6箱食品，分别装着饼干和面包，重量分别为8、9、16、20、22、27公斤。该店当天只卖

A.copier

B.microwave oven

C.toaster

D.cordless phone

E.IP phone

F.AM radio

A.R1 will forward the packet out all interfaces.

B.R1 will drop this packet because this it is not a valid IP address.

C.As R1 forwards the frame containing this packet, Sw-A will add 192.168.1.255 to its MAC table.

D.R1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF

E.As R1 forwards the frame containing this packet, Sw-A will forward it to the device assigned the IP address of 192.168.1.255.

etoreducethesizeofroutingtableontheCentralrouter.WhichpartialroutingtableentryintheCentralrouterepresentsaroutesummarythatrepresentsthevlansinPhoenixbutnoadditionalsubnets？（）

A.10.0.0.0/22issubnetted，1subnets D 10.4.0.0[90/20514560]via10.2.0.2，6w0d，serial0/1

B.10.0.0.0/28issubnetted，1subnets D10.2.0.0[90/20514560]via10.2.0.2，6w0d，serial0/1

C.10.0.0.0/22issubnetted，1subnets D10.0.0.0[90/20514560]via10.2.0.2，6w0d，serial0/1

D.10.0.0.0/30issubnetted，1subnets D10.2.2.0[90/20514560]via10.2.0.2，6w0d，serial0/1

E.10.0.0.0/28issubnetted，1subnets D10.4.4.0[90/20514560]via10.2.0.2，6w0d，serial0/1

F.10.0.0.0/30issubnetted，1subnets D10.4.4.4[90/20514560]via10.2.0.2，6w0d，serial0/1

A.Send periodic updates regardless of topology changes.

B.Send entire routing table to all routers in the routing domain.

C.Use the shortest-path algorithm to the determine best path.

D.Update the routing table based on updates from their neighbors.

E.Maintain the topology of the entire network in its database.

n in the diagram. The network administrator has several options for configuring RouterB to ensure that it will be preferred as the designated router (DR) for the 172.16.1.0 /24 LAN segment. What configuration tasks could be used to establish this preference (Choose three.)（）。

A.Configure the priority value of the Fa0/0 interface of RouterB to a higher value than any other interface on the Ethernet network.

B.Change the router id of Router B by assigning the IP address 172.16.1.130/24 to the Fa0/0 interface of RouterB.

C.Configure a loopback interface on RouterB with an IP address higher than any IP address on the other routers.

D.Change the priority value of the Fa0/0 interface of RouterB to zero.

E.Change the priority values of the Fa0/0 interfaces of RouterA and RouterC to zero.

F.No further configuration is necessary.

A.ATM

B.IDS

C.IOS

D.IOX

E.IPS

F.SDM

with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage potential differences between the two buildings. Which media type should be used for the connection（）。

A.UTP cable

B.STP cable

C.coaxial cable

D.fiber optic cable

A.HDLC

B.Ethernet

C.Token Ring

D.PPP

E.FDDI

F.Frame Relay

A.one

B.two

C.three

D.four

E.five

F.six

g scheme that conserves IP addresses3)multiple vendors4)a network with over 50 routers Which routing protocol fulfills these requirements（）。

A.RIPv1

B.RIPv2

C.EIGRP

D.OSPF