CCNA1_3_英文版_全对

Which term is used to describe the process of placing one message format into another format so that the message can be delivered across the appropriate medium?flow controlencapsulationencodingmulticastingaccess methodRefer to the graphic. Five PCs are connected through a hub. If host H1 wants to reply to a message from host H2, which statement is true?H1 sends a unicast message to H2, but the hub forwards it to all devices.H1 sends a unicast message to H2, and the hub forwards it directly to H2.H1 sends a broadcast message to H2, and the hub forwards it to all devices.H1 sends a multicast message to H2, and the hub forwards it directly to H2.Which two statements concerning networking standards are true? (Choose two.)adds complexity to networksencourages vendors to create proprietary protocolsprovides consistent interconnections across networksensures that communications work best in a single-vendor environmentsimplifies new product developmentWhat does the 100 mean when referencing the 100BASE-T Ethernet standard?type of cable usedtype of data transmissionspeed of transmissiontype of connector requiredmaximum length of cable allowedWhich address does an NIC use when deciding whether to accept a frame?source IP addresssource MAC addressdestination IP addressdestination MAC addresssource Ethernet addressWhich type of address is used in an Ethernet frame header（以太帧头部）?logical addresses onlyIP addresses onlyMAC addresses onlybroadcast addresses onlyWhat is the function of the FCS field in an Ethernet frame?detects transmission errorsprovides timing for transmissioncontains the start of frame delimiterindicates which protocol will receive the frameWhat is the purpose of logical addresses in an IP network?They identify a specific NIC on a host device.They are used to determine which host device accepts the frame.They provide vendor-specific information about the host.They are used to determine the network that the host is located on.They are used by switches to make forwarding decisions.Which device accepts a message on one port and always forwards the message to all other ports?modemswitchrouterhubWhich two networking devices are used to connect hosts to the access layer? (Choose two.)routerhubswitchservercomputerHost A needs to learn the MAC address of Host B, which is on the same LAN segment. A message has been sent to all the hosts on the segment asking for the MAC address of Host B. Host B responds with its MAC address and all other hosts disregard the request. What protocol was used in this scenario?ARPDHCPDNSWINSA switch receives a frame with a destination MAC address that is currently not in the MAC table. What action does the switch perform?It drops the frame.It sends out an ARP request looking for the MAC address.It floods the frame out of all active ports, except the origination port.It returns the frame to the sender.What is a benefit of having a router within the distribution layer(分布层)?prevents collisions on a local networkkeeps broadcasts contained within a local networkcontrols which hosts have access to the networkcontrols host-to-host traffic within a single local networkRefer to the graphic. What does the router do after it determines that a data packet from Network 1 should be forwarded to Network 2?It sends the data packet as it was received.It reassembles the frame with different MAC addresses than the original frame.It reassembles the data packet with different IP addresses than the original data packet.It reassembles both the packet and the frame with different destination IP and MAC addresses.Which table does a router use to make decisions about the interface through which a data packet is to be sent?ARP tablerouting tablenetwork tableforwarding tableIf the default gateway is configured incorrectly on the host, what is the impact on communications?The host is unable to communicate on the local network.The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.There is no impact on communications.What device is typically used as the default gateway for a computer?a server hosted by the ISPthe router interface closest to the computera server managed by a central IT departmentthe switch interface that connects to the computerWhat type of route allows a router to forward packets even though its routing table contains no specific route to the destination network?dynamic routedefault routedestination routegeneric routeWhich two items are included in a network logical map? (Choose two.)naming schemeIP addressing schemelength of cable runsphysical location of networking devicesspecific layout of interconnections between networking devices and hostsAn integrated router(集成路由器) can normally perform the functions of which two other network devices? (Choose two.)NICswitche-mail serverapplication serverwireless access pointWhat is a reason for disabling simple file sharing?It enables the user to map a remote resource with a local drive. It enables the user to share all files with all users and groups. It enables the user to share printers.It enables the user to set more specific security access levels.。