CCNA_1_UPD (1130964), страница 4
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What does the IEEE 802.2 standard represent in Ethernet technologies?MAC sublayerСтр. 10 из 2701.04.2009 0:39CISCO CCNA Certifications: CCNA 1 UPDATEDhttp://cisco-ccna-certifications.blogspot.com/search/label/CCNA%20...Physical layerLogical Link Control sublayerNetwork layer8. Why do hosts on an Ethernet segment that experience a collision use arandom delay before 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.9. Refer to the exhibit. Which option correctly matches the frame field typewith the contents that frame field includes?header field - preamble and stop framedata field - network layer packetdata field - physical addressingtrailer field - FCS and SoF10.
Host A has an IP address of 172.16.225.93 and a mask of255.255.248.0. Host A needs to communicate with a new host whose IP is172.16.231.78. Host A performs the ANDing operation on the destinationaddress. What two things will occur? (Choose two.)Host A will change the destination IP to the IP of the nearest router and forward thepacket.Host A will broadcast an ARP request for the MAC of its default gateway.A result of 172.16.225.0 will be obtained.Host A will broadcast an ARP request for the MAC of the destination host.A result of 172.16.224.0 will be obtained.A result of 172.16.225.255 will be obtained.11 Which of the following is a drawback of the CSMA/CD access method?Collisions can decrease network performance.It is more complex than non-deterministic protocols.Deterministic media access protocols slow network performance.CSMA/CD LAN technologies are only available at slower speeds than other LANtechnologies.12.
Ethernet operates at which layer of the TCP/IP network model?applicationphysicaltransportinternetdata linknetwork access13. What is the primary purpose of ARP?translate URLs to IP addressesresolve IPv4 addresses to MAC addressesprovide dynamic IP configuration to network devicesconvert internal private addresses to external public addresses14. Refer to the exhibit.
The switch and workstation are administrativelyconfigured for full-duplex operation. Which statement accurately reflectsthe 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.15. Refer to the exhibit.
Host_A is attempting to contact Server_B. Whichstatements correctly describe the addressing Host_A will generate in theprocess? (Choose two.)A packet with the destination IP of Router_B.A frame with the destination MAC address of Switch_A.A packet with the destination IP of Router_A.A frame with the destination MAC address of Router_A.A packet with the destination IP of Server_B.A frame with the destination MAC address of Server_B.16 Which statements correctly describe MAC addresses? (Choose three.)dynamically assignedcopied into RAM during system startuplayer 3 addresscontains a 3 byte OUI6 bytes long32 bits long17.
Which two features make switches preferable to hubs in Ethernet-basednetworks? (Choose two.)reduction in cross-talkminimizing of collisionssupport for UTP cablingdivision into broadcast domainsincrease in the throughput of communications18. What are the two most commonly used media types in Ethernetnetworks today? (Choose two.)coaxial thicknetcopper UTPcoaxial thinnetoptical fiberСтр. 11 из 2701.04.2009 0:39CISCO CCNA Certifications: CCNA 1 UPDATEDhttp://cisco-ccna-certifications.blogspot.com/search/label/CCNA%20...shielded twisted pair19.
Convert the binary number 10111010 into its hexadecimal equivalent.Select the correct answer from the list below.8590BAA1B31C20. After an Ethernet collision, when the backoff algorithm is invoked,which device has priority to transmit data?the device involved in the collision with the lowest MAC addressthe device involved in the collision with the lowest IP addressany device in the collision domain whose backoff timer expires firstthose that began transmitting at the same timecomments (1)TOP04:14CCNA 1:Module 8POSTED BY ADMINOptions With Highlight Colours are Correct Answer1. Which OSI layer is responsible for binary transmission, cablespecification, and physical aspects of network communication?PresentationTransportData LinkPhysical2.
An installed fiber run can be checked for faults, integrity, and theperformance of the media by using what device?light injectorOTDRTDRmultimeter3. Which characteristics describe fiber optic cable? (Choose two.)It is not affected by EMI or RFI.Each pair of cables is wrapped in metallic foil.It combines the technique of cancellation, shielding and twisting to protect data.It has a maximum speed of 100 Mbps.It is the most expensive type of LAN cabling.4. When is a straight-through cable used in a network?when connecting a router through the console portwhen connecting one switch to another switchwhen connecting a host to a switchwhen connecting a router to another router5.
Refer to the exhibit. Which type of Category 5 cable is used to make anEthernet connection between Host A and Host B?coax cablerollover cablecrossover cablestraight-through cable6. Which method of signal transmission uses radio waves to carry signals?electricalopticalwirelessacoustic7. In most business LANs, which connector is used with twisted-pairnetworking cable?BNCRJ-11RJ-45Type F8. Which of the following is a characteristic of single-mode fiber-opticcable?generally uses LEDs as the light sourcerelatively larger core with multiple light pathsless expensive than multimodegenerally uses lasers as the light source9.
Which type of cable run is most often associated with fiber-optic cable?backbone cablehorizontal cablepatch cablework area cable10. What are three measures of data transfer? (Choose three.)goodputСтр. 12 из 2701.04.2009 0:39CISCO CCNA Certifications: CCNA 1 UPDATEDhttp://cisco-ccna-certifications.blogspot.com/search/label/CCNA%20...frequencyamplitudethroughputcrosstalkbandwidth11.
With the use of unshielded twisted-pair copper wire in a network, whatcauses crosstalk within the cable pairs?the magnetic field around the adjacent pairs of wirethe use of braided wire to shield the adjacent wire pairsthe reflection of the electrical wave back from the far end of the cablethe collision caused by two nodes trying to use the media simultaneously12. What is a primary role of the Physical layer in transmitting data on thenetwork?create the signals that represent the bits in each frame on to the mediaprovide physical addressing to the devicesdetermine the path packets take through the networkcontrol data access to the media13. In LAN installations where potential electrical hazards orelectromagnetic interference may be present, what type of media isrecommended for backbone cabling?coaxfiberCat5e UTPCat6 UTPSTP14. What is a possible effect of improperly applying a connector to anetwork cable?Data will be forwarded to the wrong node.Data transmitted through that cable may experience signal loss.An improper signaling method will be implemented for data transmitted on thatcable.The encoding method for data sent on that cable will change to compensate for theimproper connection.15.
Which fiber connector supports full duplex Ethernet?Options three is right answer16. What is considered a benefit of wireless as a media choice?more host mobilitylower security risksreduced susceptibility to interferenceless impact of the surroundings on the effective coverage area17. What characteristic of UTP cable helps reduce theinterference?the metal braiding in the shieldingthe reflective cladding around corethe twisting of the wires in the cablethe insulating material in the outer jacketeffectscomments (1)ofTOP04:12CCNA 1:Module 7POSTED BY ADMINOptions With Highlight Colours are Correct Answer1. Which three factors should be considered when implementing a Layer 2protocol in a network? (Choose three.)the Layer 3 protocol selectedthe geographic scope of the networkthe PDU defined by the transport layerthe physical layer implementationthe number of hosts to be interconnected2.
Refer to the exhibit. Assuming that the network in the exhibit isconverged meaning the routing tables and ARP tables are complete, whichMAC address will Host A place in the destination address field of Ethernetframes destined for www.server?00-1c-41-ab-c0-0000-0c-85-cf-65-c000-0c-85-cf-65-c100-12-3f-32-05-af3.
Which options are properties of contention-based media access for ashared media? (Choose three.)non-deterministicless overheadone station transmits at a timecollisions existdevices must wait their turntoken passing4. What is true concerning physical and logical topologies?Стр. 13 из 2701.04.2009 0:39CISCO CCNA Certifications: CCNA 1 UPDATEDhttp://cisco-ccna-certifications.blogspot.com/search/label/CCNA%20...The logical topology is always the same as the physical topology.Physical topologies are concerned with how a network transfers frames.Physical signal paths are defined by Data Link layer protocols.Logical topologies consist of virtual connections between nodes.5. What is true regarding media access control? (Choose three.)Ethernet utilizes CSMA/CDdefined as placement of data frames on the mediacontention-based access is also known as deterministic802.11 utilizes CSMA/CDData Link layer protocols define the rules for access to different mediacontrolled access contains data collisions6.
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