Ответы на CCNA1 (1130615), страница 2
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After performing some tests,a technician has determined that the copper media supporting the LAN isexperiencing abnormal attenuation. What are two possible causes of the problem?(Choose two.)*defective connectors*excessively long cable lengthsuse of higher grade cablinglow frequency signals used in the medianetwork cable runs isolated from other cables5How are binary ones and zeros represented in fiber optic installations? (Choose two.)+5 volts/-5 volts0 volts/5 volts*light/no lighthigh to low electrical transitionlow to high electrical transition*increasing/decreasing light intensity6What factors need to be considered to limit the amount of signal attenuation inEthernet cable runs? (Choose two.)type of usersnumber of users*length of cabletype of electrical equipment*installation of connectors on the cable7To ensure reliable LAN communications, what should a technician be looking forwhen attaching connectors to the ends of UTP cable?that the white-orange/orange pair is attached first*that the wire pairs remain twisted as much as possiblethat one end of the shield is properly ground but not the otherthat 50 ohm termination resistors are on both ends8Which of the following describes frequency?length of each waveheight of each wave*number of cycles each secondamount of time between each wave9What conditions are described when transmission signals from one wire pair affectsanother wire pair? (Choose two.)*noiseresistance mismatchjitter*crosstalkattenuation10What is expected when crosstalk is present in networks with higher transmissionfrequencies? (Choose two.)jitter*increase in crosstalkhigher signal attenuationincreases in cancellation effect*destruction of more of the data signalChapter 5 with 100%1Refer to the exhibit.
What is the appropriate cable to use at each of the numberednetwork connections?1-crossover; 2-straight-through; 3-crossover; 4-straight-through1-straight-through; 2-crossover; 3-straight-through; 4-straight-through1-straight-through; 2-crossover; 3-crossover; 4-straight-through*1-rollover; 2-crossover; 3-straight-through; 4-straight-through1-rollover; 2-straight-through; 3-straight-through; 4-straight-through2Which two devices are considered OSI Layer 1 devices? (Choose two.)*hubsroutersbridgesswitches*repeaters3What device is used to connect hosts to an Ethernet LAN and requires a straight-through UTP cable between the hosts and this device?NICrouter*switchserver4What is the most common type of cabling used in LANs?STP*UTPcoaxfiber5In which situations would a crossover cable be used to connect devices in a network?(Choose two.)switch to PC*switch to hubswitch to routerswitch to server*switch to switch6Refer to the exhibit.
How many collision domains exist in the network?1*24787What type of cable would be used to make the connection between the console portof a router and a workstation?crossover*rolloverstraight-throughpatch8Which function is a unique responsibility of the DCE devices shown in the exhibit?transmission of datareception of data*clocking for the synchronous linknoise cancellation in transmitted data9Which address does a bridge use to make filtering and switching decisions?source MACsource IP*destination MACdestination IPnetwork IP address10What is characteristic of the operation of a hub?selectively drops packets that represent potential security risks*forwards a frame out all interfaces except the inbound interfacebased on IP address, dynamically learns the interfaces to which all devices areattachedupon power on, queries the devices on all interface to learn the MAC addresses ofthe attached devicestransmits a frame to the specific interface to which the device with the MACdestination address is attached11Users with systems that are attached to a hub are complaining about poor responsetime.
What device could replace the hub and provide immediate response timeimprovement?router*switchbridgerepeater12Which of the following are benefits of peer-to-peer networks? (Choose three.)centralized security*easy to createvery scalable*no centralized equipment required*centralized administrator not requiredcentralized control of assets13Which statement is accurate about a WAN link?*The link transmits data serially.The link uses a maximum distance of 100 meters.The link uses the same transmission rate as all other WAN links use.The link uses the same standardized connector style that is used for all WANtechnologies.14Which items in the exhibit are DTE devices?A and BB and CC and D*A and DA, B, C, and D15At which layer of the OSI model does the MAC address of a NIC reside?physicalapplicationnetworktransport*data linksession16Refer to the exhibit.
A technician measured the lengths of the CAT 5e structuredcable runs in the exhibit. How should the technician evaluate the cabling shown inthe diagram to the network administrator?All cabling to work areas are within specifications.Station A and B may experience intermittent problems because the length exceedsthe recommended standard.*Station B may experience intermittent problems because the length exceeds therecommended standard.Station C may experience intermittent network connectivity because the length isless than the recommended standard.Station A and B will have intermittent problems because the length exceeds therecommended standard.Station C will not have network connectivity because the length is less than therecommended standard.17Which statement describes a typical use of Gigabit Ethernet?to provide high-speed desktop connectivity for average usersto provide connectivity to low to medium volume applicationsto provide medium volume connectivity to workgroup servers*to provide high-speed connectivity for backbones and cross connects18The ends of a UTP cable are shown in the exhibit.
Which cable configuration isshown?crossoverrolloverreversed-pair*straight-throughsplit-pairconsole19The ends of a UTP cable are shown in the exhibit. Which cable configuration isshown?console*crossoverrolloverreversed-pairsplit-pairstraight-through20Which of the following are benefits of a wireless network? (Choose two.)higher data speedsbetter security*mobilityless expensive NIC cards*no need to run cables to hostsChapter 6 with 100%1Where does the MAC address originate?DHCP server databaseconfigured by the administratorburned into ROM on the NIC cardnetwork configuration on the computerincluded in the creation of the processor chip2Refer to the exhibit. A technician wants to increase the available bandwidth for theworkstation by allowing the switch and the NIC on the workstation to transmit andreceive simultaneously. What will permit this?CSMA/CDfull-duplexFastEthernetcrossover cable3Which of the following are specified by IEEE standards as sublayers of the OSI data linklayer? (Choose two.)Logical Link ControlLogical Layer ControlMedia Access ControlLogical Link CommunicationMedia Access CommunicationPhysical Access Communication4Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)?(Choose three.)reliablepoint-to-pointnondeterministicconnection-orientedcollision environmentfirst-come, first-served approach5A router has an Ethernet, Token Ring, serial, and ISDN interface.
Which interfaces willhave a MAC address?serial and ISDN interfacesEthernet and Token Ring interfacesEthernet and ISDN interfacesToken Ring and serial interfaces6In an Ethernet LAN, how does the NIC know when it can transmit data?An Ethernet NIC transmits data as soon as the frame is received.An Ethernet NIC transmits data as soon as the NIC receives a token.An Ethernet NIC transmits data when it senses a collision.An Ethernet NIC transmits data after listening for the absence of a signal on themedia.7Which two devices can provide full-duplex Ethernet connections? (Choose two.)hubmodemrepeaterNICLayer 2 switch8Why do hosts on an Ethernet segment that experience a collision use a random delaybefore attempting to transmit a frame?A random delay is used to ensure a collision-free link.A random delay value for each device is assigned by the manufacturer.A standard delay value could not be agreed upon among networking device vendors.A random delay helps prevent the stations from experiencing another collisionduring the transmission.9On a local area network, one workstation can send data on the line while it is receivingdata.
What type of data transfer does this describe?hybridhalf duplexfull duplexmultilink10At what layer of the OSI model does a MAC address reside?1234711Refer to the exhibit. All hosts are in listen mode. Host 1 and Host 4 both transmit data atthe same time. How do the hosts respond on the network? (Choose two.)Hosts 1 and 4 may be operating full duplex so no collision will exist.The hub will block the port connected to Host 4 to prevent a collision.After the end of the jam signal, Hosts 1, 2, 3, and 4 invoke a backoff algorithm.When the four hosts detect the collision, Hosts 1, 2, 3, and 4 generate a jam signal.Hosts 1 and 4 are assigned shorter backoff values to provide them priority to access themedia.If a host has data to transmit after the backoff period of that host, the hostchecks to determine if the line is idle, before transmitting.12Refer to the exhibit. The small office network shown in the exhibit consists of fourcomputers connected through a hub.
Which configuration would cause collisions anderrors on the network?autonegotiationFastEthernetpeer-to-peer shared resourcesadministratively configured full duplex13How many hexadecimal digits are in a MAC address?2812163214Which statement describes how CSMA/CD on an Ethernet segment manages theretransmission of frames after a collision occurs?The first device to detect the collision has the priority for retransmission.The device with the lowest MAC address determines the retransmission priority.The devices on the network segment hold an election for priority to retransmit dataThe devices transmitting when the collision occurs DO NOT have priority forretransmission.15Refer to the exhibit.
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