單項選擇題Why would a network administrator configure port security on a switch()。

A.to prevent unauthorized Telnet access to a switch port
B.to limit the number of Layer 2 broadcasts on a particular switch port
C.to prevent unauthorized hosts from accessing the LAN
D.to protect the IP and MAC address of the switch and associated ports
E.to block unauthorized access to the switch management interfaces over common TCP ports


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1.單項選擇題Hosts on the same VLAN can communicate with each other but are unable to communicate with hosts on different VLANs. What is needed to allow communication between VLANs()。

A.a switch with a trunk link that is configured between the switches
B.a router with an IP address on the physical interface that is connected to the switch
C.a switch with an access link that is configured between the switches
D.a router with subinterfaces configured on the physical interface that is connected to the switch

2.單項選擇題There are no boot system commands in a router configuration in NVRAM.What is the fall back sequence that router will use to find an ios during reload?()

A.Flash,TFTPserver,ROM
B.Flash,NVRAM,ROM
C.ROM,NVRAM,TFTPserver
D.NVRAM,TFTPserver,ROM
E.TFTPserver,Flash,NVRAM

3.單項選擇題

根據下圖,Switch1剛剛完成重啟,并完成上電自檢。HostA發(fā)送它的第一個偵到HostC,交換機首先會對switching table做什么操作()

A.Switch1會添加192.168.23.4到switchingtable
B.Switch1添加192.168.23.12到switchingtable
C.Switch1添加000A 8A47.E612到switchingtable
D.Switch1添加000B DB95.2EE9到switchingtable

4.單項選擇題哪種擴頻技術是802.11B定義使用的?()

A.IR
B.DSSS
C.FHSS
D.DSSS and FHSS
E.IR,FHSS,and DSSS

5.單項選擇題What is the effect of the following access list condition access-list 101 permit ip 10.25.30.0 0.0.0.255 any()。

A.permit all packets matching the first three octets of the source address to all destinations
B.permit all packets matching the last octet of the destination address and accept all source addresses
C.permit all packets from the third subnet of the network address to all destinations
D.permit all packets matching the host bits in the source address to all destinations
E.permit all packets to destinations matching the first three octets in the destination address

6.單項選擇題Which IPV6 routing protocol uses multicast group FF02::9 to send updates?()

A.RIPng
B.OSPFv3
C.static
D.IS-ISfor IPv6

7.單項選擇題

根據下圖,R1能通告給R2的最有效的匯總是?()

A.172.1.0.0/22
B.172.1.0.0/21
C.172.1.4.0/22
D.172.1.4.0/24  172.1.5.0/24  172.1.6.0/24  172.1.7.0/24
E.172.1.4.0/25  172.1.4.128/25  172.1.5.0/24  172.1.6.0/24  172.1.7.0/24

8.多項選擇題What are three IPv6 transition mechanisms?()

A.6to4 tunneling
B.VPN tunneling
C.GRE tunneling
D.ISATAP tunneling
E.PPP tunneling
F.Teredo tunneling

9.單項選擇題Given the output of the Floor3 switch, what statement describes the operation of this switch()。

A.VTP is disabled on this switch.
B.The switch can create, change, and delete VLANs.
C.The switch learns VLAN information but does not save it to NVRAM.
D.The switch can create VLANs locally but will not forward this information to other switches.
E.The switch learns VLAN information and updates the local VLAN data base in NVRAM.

10.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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