On which types of network will OSPF el...

单项选择题On which types of network will OSPF elect a backup designated router（）。

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess

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1.单项选择题Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?（）

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

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2.单项选择题Which item represents the standard IPACL？（）

A.access-list 50 deny 192.168.1.10.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq22
D.access-list 101 deny tcp any host 192.168.1.1

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3.单项选择题What is the default routing update period for RIPv2?（）

A.15 seconds
B.30 seconds
C.180 seconds
D.240 seconds

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4.多项选择题The OSPF Hello protocol performs which of the following tasks (Choose two.)（）。

A.It provides dynamic neighbor discovery.
B.It detects unreachable neighbors in 90 second intervals.
C.It maintains neighbor relationships.
D.It negotiates correctness parameters between neighboring interfaces.
E.Ituses timers to elect the router with the fastest links as the designated router.
F.It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.

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5.多项选择题一个公司正在安装IP电话。电话和办公室电脑连接到同个设备上，为了保证电话数据的最大传输量，公司需要确定电话流量是和办公室电脑的数据流量不是在同一个网络上。以下哪个是最好的网络设备，用来直连到电话和电脑，并且，哪种技术应该被配置在该设备上？（）

A.hub
B.router
C.switch
D.STP
E.subinterfaces
F.VLAN

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6.单项选择题An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC.If a reply is received, what does this confirm?（）

A.The PC has connectivity with a local host.
B.The PC has connectivity with a Layer 3 device.
C.The PC has a default gateway correctly configured
D.The PC has connectivity up to Layer 5 of the OSI model
E.The PC has the TCP/IP protocol stack correctly installed.

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7.单项选择题 根据下图显示的拓扑结构和路由器配置，一个在该LAN上的主机正在通过INTERNET访问一个FTP服务器。下列地址中哪个可以作为路由器发送到该目的服务器的数据包的源地？（）

A.10.10.0.1
B.10.10.0.2
C.199.99.9.33
D.199.99.9.57
E.200.2.2.17
F.200.2.2.18

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8.单项选择题How does using the service password encryption command on a router provide additional security?（）

A.by encrypting all passwords passing through the router
B.by encrypting passwords in the plain text configuration file
C.by requiring entry of encrypted passwords for access to the device
D.by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E.by automatically suggesting encrypted passwords for use in configuring the router

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9.多项选择题A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalyst switch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of the server is allowed by switch port Fa0/1 (Choose two.)（）。

A.Configure port Fa0/1 to accept connections only from the static IP address of the server.
B.Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.
C.Configure the MAC address of the server as a static entry associated with port Fa0/1.
D.Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.
E.Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server.
F.Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.

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10.多项选择题Which two are features of IPv6？（）

A.multicast
B.broadcast
C.allcast
D.podcast
E.anycast

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