examen4ccna1v5.0, NEW, CCNA
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//-->By CCNA5.NETDownloaded from MIPDF.COMCCNA 1 Chapter 4 v5.0 Exam Answers 20131What are two reasons for physical layer protocols to use frame encoding techniques? (Choosetwo.)to identify where the frame starts and ends*to distinguish data bits from control bits*to reduce the number of collisions on the mediato increase the media throughputto provide better media error correction2Which statement is correct about multimode fiber?Multimode fiber commonly uses a laser as a light source.Multimode fiber cables carry signals from multiple connected sending devices.SC-ST patch cords are used with multimode fiber cables.SC-SC patch cords are used with multimode fiber cables.*3Which layer of the OSI model is responsible for specifying the encapsulation method used forspecific types of media?data link*applicationtransportphysical4The throughput of a FastEthernet network is 80 Mb/s. The traffic overhead for establishingsessions, acknowledgments, and encapsulation is 15 Mb/s for the same time period. What isthe goodput for this network?15 Mb/s55 Mb/s65 Mb/s*95 Mb/s80 Mb/sBy CCNA5.NETDownloaded from MIPDF.COM5A network administrator notices that some newly installed Ethernet cabling is carrying corruptand distorted data signals. The new cabling was installed in the ceiling close to fluorescentlights and electrical equipment. Which two factors may interfere with the copper cabling andresult in signal distortion and data corruption? (Choose two.)RFI *signal attenuationcrosstalkEMI *extended length of cabling7What is the purpose of the FCS field in a frame?to obtain the MAC address of the sending nodeto verify the logical address of the sending nodeto compute the CRC header for the data fieldto determine if errors occurred in the transmission and reception*8As data travels on the media in a stream of 1s and 0s how does a receiving node identify thebeginning and end of a frame?The transmitting node sends an out-of-band signal to the receiver about the beginning of the frame.The transmitting node sends a beacon to notify that a data frame is attached.The receiving node identifies the beginning of a frame by seeing a physical address.The transmitting node inserts start and stop bits into the frame.*9Which statement describes signaling at the physical layer?Sending the signals asynchronously means that they are transmitted without a clock signal.*Signaling is a method of converting a stream of data into a predefined code.Wireless encoding includes sending a series of clicks to delimit the frames.In signaling, a 1 always represents voltage and a 0 always represents the absence of voltage.By CCNA5.NETDownloaded from MIPDF.COM10A network administrator is designing the layout of a new wireless network. Which three areasof concern should be accounted for when building a wireless network? (Choose three.)mobility optionsextensive cablingcoverage area*interference*packet collisionsecurity*11What is one main characteristic of the data link layer?It converts a stream of data bits into a predefined code.It shields the upper layer protocol from being aware of the physical medium to be used in thecommunication.*It accepts Layer 3 packets and decides the path by which to forward a frame to a host on a remotenetwork.It generates the electrical or optical signals that represent the 1 and 0 on the media.12What is one advantage of using fiber optic cabling rather than copper cabling?It is easier to terminate and install than copper cabling.It is able to be installed around sharp bends.It is usually cheaper than copper cabling.It is able to carry signals much farther than copper cabling.*13Fill in the blank.What acronym is used to reference the data link sublayer that identifies the network layer protocolencapsulated in the frame?“LLC”14Why are two strands of fiber used for a single fiber optic connection?They allow for full-duplex connectivity.*They prevent crosstalk from causing interference on the connection.By CCNA5.NETDownloaded from MIPDF.COMThey increase the speed at which the data can travel.The two strands allow the data to travel for longer distances without degrading.15Refer to the exhibit. The PC is connected to the console port of the switch. All the otherconnections are made through FastEthernet links. Which types of UTP cables can be used toconnect the devices?1 – crossover, 2 – rollover, 3 – straight-through1 – crossover, 2 – straight-through, 3 – rollover1 – rollover, 2 – straight-through, 3 – crossover*1 – rollover, 2 – crossover, 3 – straight-through16What is true concerning physical and logical topologies?Physical topologies display the IP addressing scheme of each network.Logical topologies determine the media access control method used.*Physical topologies are concerned with how a network transfers frames.The logical topology is always the same as the physical topology.17Fill in the blank.The term “Bandwidth” indicates the capacity of a medium to carry data and it is typically measured inkilobits per second (kb/s) or megabits per second (Mb/s).18Refer to the exhibit. What is wrong with the displayed termination?By CCNA5.NETDownloaded from MIPDF.COMThe untwisted length of each wire is too long.*The wires are too thick for the connector that is used.The jack used is an RJ-11 connector instead of an RJ-45 connector.The cable is not shielded.19Fill in the blank with a number.10,000,000,000 b/s can also be written as ”10” Gb/s.20What are two characteristics of 802.11 wireless networks? (Choose two.)Collisions can exist in the networks. *They are collision-free networks.They use CSMA/CD technology.Stations can transmit at any time.They use CSMA/CA technology.*21A network administrator is required to upgrade wireless access to end users in a building. Toprovide data rates up to 1.3 Gb/s and still be backward compatible with older devices, whichwireless standard should be implemented?802.11n802.11ac*802.11g802.11b22How is the magnetic field cancellation effect enhanced in UTP cables?by decreasing the number of wires that are used to carry databy increasing the thickness of the PVC sheath that encases all the wiresby increasing and varying the number of twists in each wire pair*by increasing the thickness of the copper wires23Match the steps to the physical layer operations that occur when data is sent from one nodeand received at another node.
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