Ответы на CCNA1 (1130615), страница 3
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Host A is communicating with host F. What happens to a frame sentfrom host A to host F as it travels over the Ethernet segments?The frame format is modified as it passes through each switch.The frame format remains the same across each Ethernet segment.The frame format is modified as the media speed changed at switch B and switch E.The frame format is modified as the media material changes between copper and fiber atswitch C and switch D.16Refer to the exhibit. The switch and workstation are administratively configured for fullduplex operation. Which statement accurately reflects the operation of this link?No collisions will occur on this link.Only one of the devices can transmit at a time.The switch will have priority for transmitting data.The devices will default back to half duplex if excessive collisions occur.17In which two layers of the OSI model does Ethernet function? (Choose two.)applicationsessiontransportnetworkdata linkphysical18When a collision occurs in a network using CSMA/CD, how do hosts with data to transmitrespond after the backoff period has expired?The hosts return to a listen-before-transmit mode.The hosts creating the collision have priority to send data.The hosts creating the collision retransmit the last 16 frames.The hosts extend their delay period to allow for rapid transmission.19What are three functions of a NIC in a PC? (Choose three.)A NIC connects the PC to the network media.A NIC detects collisions on the Ethernet segment.A NIC checks the formatting of data before it is transmitted.A NIC passes the contents of selected frames to the upper OSI layers.A NIC acknowledges and retransmits data that was not received properly.A NIC discards frames when the destination IP address does not match the local host.Chapter 7 with 100%1 Which Ethernet standard does the IEEE 802.3 standard recommend for backboneinstallations?10BASE-T100BASE-T100BASE-FX1000BASE-LX2 How does 1000BASE-T use the UTP wire pairs to accomplish transmission?two pairs are used to transmit and two pairs are used to receiveone pair is used to transmit, one pair is used to receive, one pair is used for clocking, andone pair is used for error correctionall four pairs are used in parallel by both hosts to transmit and receivesimultaneouslytwo pairs of wires are used as in 10BASE-T and 100BASE-TX3 Which statements describe Gigabit Ethernet technology? (Choose two.)operates at 100 Mbpstypically used for backbone cablingrequires shielded twisted-pair cablingcan be implemented over copper and fiberprimarily used between workstations option4 To make sure timing limitations are not violated when implementing a 10 MbpsEthernet network involving hubs or repeaters, a technician should adhere to which rule?the 4-5-3 rulethe 6-4-2 rulethe 3-4-5 rulethe 5-4-3 rule5 At which OSI layer do the differences between standard Ethernet, Fast Ethernet andGigabit Ethernet occur?physical layerdata link layernetwork layertransport layer6 Which of the following are Fast Ethernet technologies? (Choose two.)100BASE-5100BASE21000BASE-F100BASE-FX100BASE-TX7 What RJ-45 pins are unused when transmitting and receiving data in an Ethernet100BASE-T Category 5 UTP cable? (Choose two.)1 and 23 and 64 and 57 and 88 What is the maximum distance that 10BASE-T will transmit data before signalattenuation affects the data delivery?100 meters185 meters300 meters500 meters9 Which media types can be used in an implementation of a 10BASE-T network? (Choosethree.)Category 5 UTPCategory 5e UTPCategory 3 UTPcoaxial cablemulti-mode fibersingle mode fiber10 Which of the following Ethernet technologies are considered legacy Ethernet? (Choosethree.)10BASE210BASE510BASE-T100BASE-T100BASE-FX100BASE-TXChapter 8 with 100%1Refer to the exhibit.
The switch and the hub have default configurations, and the switchhas built its CAM table. Which of the hosts will receive the data when workstation A sendsa unicast packet to workstation C?workstation Cworkstations B and Cworkstations B, C, and the E0 interface of the routerworkstations B, C, D, E, F, and the E0 interface of the router2Refer to the exhibit. How many broadcast domains exist in classroom 240?1251213153Which networking devices use the MAC address to make forwarding decisions? (Choosetwo.)NICbridgehubswitchrepeater4Which networking device reduces the size of both collision domains and broadcastdomains?hubLayer 2 switchrouterbridgerepeater5A network administrator has a multi-floor LAN to monitor and maintain. Through carefulmonitoring, the administrator has noticed a large amount of broadcast traffic slowing thenetwork.
Which device would you use to best solve this problem?bridgehubroutertransceiver6What is used to prevent Layer 2 switching loops?bridgingsegmentationAddress Resolution ProtocolSpanning-Tree Protocol7Which devices will create multiple collision domains in an Ethernet network? (Choosetwo.)NIChubswitchrouterrepeater8Exhibited is a portion of ABC Company internetwork. Which of the connections can be fullduplex?segments 1 and 2segment 2segments 3 and 4segments 2, 3, and 4segments 1, 2, 3, and 49A PC receives a frame.
Which situation will cause the NIC on the receiving host to passthe frame contents up the OSI layers to be processed by the PC?The frame is a runt frame.The destination MAC address of the frame is FFFF.FFFF.FFFF.The transmitting host generated a jam signal during the frame transmission.The recalculated checksum for the frame does not match the FCS on the frame.10Two newly hired technicians are discussing the implementation of a new LAN. Onetechnician proposes installing a hub. The other technician advises installing a switch.Which statements are true about the differences between a hub and a switch? (Choosetwo.)A hub operates at Layer 2 of the OSI model.A hub reduces the number of collisions on a LAN.A hub works at a higher OSI model layer than a switch.A switch provides more throughput to hosts on a LAN.A switch provides a collision-free environment on a LAN.The number of collisions on a LAN are the same whether a hub or a switch is used.11Refer to the exhibit.
Forty-eight workstations are connected to a hub. The users are ableto connect to the network, but access is very slow. An entry-level technician replaces the10 Mbps hub with 100 Mbps hub but the problem still exists. What is the mosteconomical way to correct the problem?Replace the hub with a switch.Replace the hub with a router.Replace the hub with a 1 Gbps hub.Replace the hub with a 10 Mbps fiber hub.12What will a bridge do if it receives a frame with a MAC address that is not within thetable?discard frameignore framesend frame to appropriate portsend frame to all ports except source port13What is characteristic of the operation of a Layer 2 switch?selectively drops packets that represent potential security risksdynamically learns the interfaces to which all devices are attached based on IP addressduring switch initialization, queries the devices on all interfaces to learn the MACaddresses of the attached devicesuses the destination MAC address to determine the specific interface to forward a frame14Which devices are primarily used to extend cable segments within a collision domain byregenerating the data signals? (Choose two.)switchrepeaterrouterbridgehub15An administrator would like to connect ten workstations on a 192.168.0.0/24 network.The device selected by the administrator must allow connectivity between hosts withoutsharing bandwidth.
Which device would be appropriate?hubrouterswitchrepeaterChapter 9 with 100%1How many usable hosts are available given a Class C IP address with the default subnetmask?2542552565105115122Which three addresses are considered to be private addresses? (Choose three.)10.45.09.2315.87.234.87172.32.45.90172.17.78.98192.169.89.56192.168.45.233Which statement accurately describes public IP addresses?Public addresses cannot be used within a private network.Public IP addresses must be unique across the entire Internet.Public addresses can be duplicated only within a local network.Public IP addresses are only required to be unique within the local network.Network administrators are free to select any public addresses to use for network devicesthat access the Internet.4Refer to the exhibit.
Based on the information shown, which two statements are true?(Choose two.)An ARP request must be used to obtain an address that is placed in the ARP table.Frames from other hosts in the network to this host will use a destination address of 0006-25-25-6e-5d.The only remote locations that can be reached from this host are 192.168.1.97 and192.168.1.254.If a packet is sent to a network device other than 192.168.1.97 and192.168.1.254, an ARP request must be used.If the computer with the IP address of 192.168.1.94 sends a packet to thedevice with the IP address 192.168.1.97, no ARP request is required.5Which TCP/IP model layer supports both LAN and WAN technologies?network access layerinternet layertransport layerapplication layer6Refer to the exhibit.
What is the purpose of the Obtain an IP address automatically optionshown in the exhibit?to configure the computer to use ARPto configure the computer to use DHCPto configure the computer to use a routing protocolto configure the computer with a statically assigned IP address7Refer to the exhibit. Which devices are recommended to have the IP addresses manuallyconfigured?PC1 and PC2all serversonly PC2 Laptopall hosts and all servers8Refer to the exhibit.
Which two statements are correct in reference to the output shown?(Choose two.)The LAN segment is subnetted to allow 254 subnets.The DNS server for this host is on the same subnet as the host.The host automatically obtained the IP addresses 192.168.1.100.The host received the IP address from the router on the local LAN segment.The host is assigned an address of 00-50-8D-F1-EA-8D by the administrator.9What are two facts about how ARP resolves an IP address to a MAC address? (Choosetwo.)The originating host dynamically issues an arp –a command to obtain the destinationMAC address.The originating host broadcasts an ARP request packet and each host in a localnetwork receives this packet.The originating host dynamically issues an icmp echo request command to obtain thedestination MAC address.The host with the specified destination IP address sends an ARP reply packetcontaining its MAC address back to the originating host.The host with the specified destination IP address sends an icmp echo reply packet to theoriginating host with its MAC address.10What is the primary responsibility of the transport layer?allows access to the network mediaprovides data representation and encodingselects paths through the network for data to traveldefines end-to-end connectivity between host applications11When a host has an empty ARP cache, what is the next step the host will take to find thedestination MAC address of a remote host?sends an ARP request as a unicast to the serversends an ARP request as a unicast to the destinationsends an ARP request as a broadcast to all hosts in the local networksends an ARP request as a unicast to the default gateway12Which two statements correctly describe the IP address 127.0.0.1? (Choose two.)It belongs to the Class A range of addresses.It belongs to the Class B range of addresses.It belongs to the Class C range of addresses.It is reserved for loopback testing.It is reserved for multicast group testing.It is reserved for unicast testing.13Why is IP considered a best-effort protocol?IP detects lost packets.IP validates the content of the packets.IP does not provide acknowledgment of the data delivery.IP reorders the packet as they arrive at the destination host.14Which subnet mask would be assigned to the network address of 192.168.32.0 toprovide 254 useable host addresses per subnetwork?255.255.0.0255.255.255.0255.255.254.0255.255.248.015What is the purpose of a DHCP server on a network?to resolve MAC addresses to IP addressesto resolve IP addresses to MAC addressesto resolve host names to IP addressesto assign IP addresses dynamically to hoststo assign a MAC address to a host16What is the network broadcast address for a Class C address of 192.168.32.0 with thedefault subnet mask?192.168.0.0192.168.0.255192.168.32.0192.168.32.254192.168.32.25517Which IPv4 class provides the highest number of host addresses per network?Class AClass BClass CClass DClass E18Why were private IP addresses developed?to permit dynamic assignment of IP addressesto permit the duplication of public IP addressesto minimize the utilization of reserved IP addressesto permit public IP addresses to be used in private networksto address the issue of not enough available public IP addresses19Which IPv4 class of addresses provides the most networks?Class AClass BClass CClass DClass E20Refer to the exhibit.
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