Cisco 4 Test 1

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limitless1971
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208026
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Cisco 4 Test 1
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2013-03-18 14:57:52
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Cisco Test
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Cisco 4 Test 1
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  1. At which layers of the OSI model does a WAN operate? (Choose two.) Physical layer - Data Link Layer - Network Layer - Transport Layer - Presentation Layer - Application Layer
    Physical Layer - Data link Layer
  2. Which three WAN devices can be found in the cloud? ATM Switches - Core Routers - CSU/DSU - Ethernet switches - Frame Relay switches - Repeaters
    ATM switches - core routers - Frame Relay switches
  3. Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users to and from a network? core router - access-server - Frame Relay switch - ATM switch
    access server
  4. Which packet-switched WAN technology offers high-bandwidth connectivitiy capable of manageing data, voice, and video all on the same infrastructure? Time Divicion Multiplexing (TDM) - metro ethernet - integrated services digital network (ISDN) - Public Switched Telephone Network (PSTN)
    metro ethernet
  5. Which two features are identified with Frame Relay connections? 53 byte cells - DLCI - DSLAM - PVC - SPID
    DLCI - PVC
  6. Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits? ATM - ISDN - Frame Relay - metro ethernet
    ATM
  7. What are two advantages of an analog PSTN WAN connection? low cost - availability - traffic encryption - available bandwidth - support for voice and video
    low cost - availability
  8. What three terms are associated with ISDN PRI? cell - DLCI - circuit switching - packet switching - data bearer channels - time division multiplexing
    circuit switching - data bearer channels - time division multiplexing
  9. What can cause a reduction in available bandwidth on a cable broadband connection? smaller cells - number of subscribers - committed information rate - distance from the central office of the provider
    number of subscribers
  10. What type of connectivity is established when VPNs are used from the remote site to the private network? PVCs - DLCIs - tunnels - dedicated Layer 2 links
    tunnels
  11. A U.S. company requires a WAN connection used only to transfer sales data from individual stores to the home office. All transfers will occur after business hours. The required bandwidth for this connection is estimated to be less than 38kbps. Which type of connection requires the least investment for this company? ATM - ISDN - analog dialup - T1 Leased Line
    analog dialup
  12. For digital lines, which device is used to establish the communications link between the customer equipment and the local loop? CSU/DSU - Frame Relay switch - ISDN switch - modem - PBX switch
    CSU/DSU
  13. Which term describes a device that will put data on the local loop? DLCI - DTE - DCE - BRI - PRI
    DCE
  14. Which switching type will allow the communication devices in the provider network to be shared and only allocated to an individual subscriber during data transfer? circuit switched - dedicated switched lines - frame switched - packet switched
    packet switched
  15. A company needs a WAN connection that is capable of transferring voice, video, and data at a minimum data rate of 155 Mbps. Which WAN connection is the best choice? x.25 - DSL - ATM - ISDN BRI - ISDN PRI
    ATM
  16. Which two devices are commonly used as data communications equipment? modem - router - CSU/DSU - ISDN switch - Ethernet switch
    modem - CSU/DSU
  17. Which statement is true of the functionality of the layers in the hierarchical network model? The purpose of the access layer is to provide very high bandwidth communications between network devices - Most security screening to prevent unauthorized entry to the network happens at the core layer - untrusted external connections are segmented from the rest of the network at all three levels - The distribution layer aggregates WAN connections at the edge of the campus.
    The distribution layer aggregates WAN connections at the edge of the campus.
  18. Which statement is true about data connectivity between a customer and a service provider? Normally the CSU/DSU is the designated demarcation point for the service provider but not the customer. - The segment between the demarcation point and the central office is known as the "last mile." - The local loop is the segment between the CSU/DSU and the serial port on a router. - Putting data on the local loop is the responsibility of the DTE.
    The segment between the demarcation point and the central office is known as the "last mile."
  19. Which statement is true about the differences between a WAN and a LAN? WANs generally support higher bandwidth than LANs support. - A WAN link typically traverses shorter geographic distances than a LAN link traverses. - A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not. - All WAN implementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use.
    A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not.
  20. Why is the call setup time of a circuit-switched WAN implementation considered a drawback? Routing protocols are incompatible with this function. - It restricts the communication sent to voice traffic only. - A telephone must be used to initially start transferring data. - Data cannot be transferred until a circuit has been established.
    Data cannot be transferred until a circuit has been established.
  21. Which statement about WAN protocols is correct? ATM differs from other WAN protocols in that it uses variably sized packets.- Most WAN protocols use HDLC or a variant of HDLC as a framing mechanism. - The frame header consists of the frame check sequence and cyclic redundancy check. - ISDN differs from Frame Relay, HDLC, and ATM in that it is packet-switched rather than circuit-switched technology.
    Most WAN protocols use HDLC or a variant of HDLC as a framing mechanism.
  22. What is an advantage of packet-switched technology over circuit-switched technology? Packet-switched networks are less susceptible to jitter than circuit-switched networks are. - Packet-switched networks can efficiently use multiple routes inside a service provider network. - Packet-switched networks do not require an expensive permanent connection to each endpoint. - Packet-switched networks usually experience lower latency than circuit-switched networks experience.
    Packet-switched networks can efficiently use multiple routes inside a service provider network.
  23. Which two statements are true about time-division multiplexing (TDM)? TDM relies on Layer 3 protocols to operate. - Multiple channels can transmit over a single link. - Original data streams must be reconstructed at the destination. - TDM methods vary depending on the Layer 2 protocol that is used. - It allows information from multiple channels to be allocated bandwidth on multiple wires.
    Multiple channels can transmit over a single link. - Original data streams must be reconstructed at the destination.
  24. What does the demarcation point represent in data communication physical circuits? DTE/DCE interface on the device connecting to the Internet - location of the firewall or router - physical point at which the public network ends and the private customer network begins - tag assigned to the physical block where a cross-connect occurs
    physical point at which the public network ends and the private customer network begins
  25. Which serial communications DTE/DCE interface standard is used to provide high-speed connectivity of up to 52 Mbps between LANs and is found on many high-end Cisco routers? EIA/TIA 232 (RS-232) - EIA/TIA 422 (RS-422) - EIA/TIA 423 (RS-423) - EIA/TIA-612/613 (HSSI) - ITU V.35
    EIA/TIA-612/613 (HSSI)
  26. Why are serial connections preferred over parallel connections for long transmission lengths? Parallel connections do not support error checking. - Parallel connections are subject to excessive attenuation. - Parallel connections are subject to clock skew and to crosstalk between wires. - Parallel connections transmit over only two wires and therefore transmit data more slowly.
    Parallel connections are subject to clock skew and to crosstalk between wires.
  27. Which three statements are correct about HDLC encapsulation? HDLC does not support CDP. - HDLC and PPP are compatible. - HDLC supports PAP and CHAP authentication. - HDLC implementation in Cisco routers is proprietary. - HDLC is the default serial interface encapsulation on Cisco routers. - HDLC uses frame delimiters to mark the beginnings and ends of frames.
    HDLC implementation in Cisco routers is proprietary. - HDLC is the default serial interface encapsulation on Cisco routers. - HDLC uses frame delimiters to mark the beginnings and ends of frames.
  28. Which three statements are true regarding LCP? It is responsible for negotiating link establishment. - It negotiates options for Layer 3 protocols running over PPP. - It uses MD5 encryption while negotiating link establishment parameters. - It terminates the link upon user request or the expiration of an inactivity timer. - It can test the link to determine if link quality is sufficient to bring up the link. - It monitors the link for congestion and dynamically adjusts the acceptable window size.
    It is responsible for negotiating link establishment. - It terminates the link upon user request or the expiration of an inactivity timer. - It can test the link to determine if link quality is sufficient to bring up the link.
  29. Which two options can LCP negotiate? link quality - authentication - dynamic flow control - compression and network layer address for IP - connection-oriented or connectionless communication methods
    link quality - authentication
  30. Which PPP configuration option can be used to establish load balancing over the interfaces of a router? callback - multilink - compression - error detection
    multilink
  31. What function do Network Control Protocols provide for a PPP connection? to supply error detection - to establish and terminate data links - to provide authentication capabilities to PPP - to manage network congestion and to allow quality testing of the link - to allow multiple Layer 3 protocols to operate over the same physical link
    to allow multiple Layer 3 protocols to operate over the same physical link
  32. Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established? (Open: IPCP, CDPCP)
    2
  33. Refer to the exhibit. Which statement is true about PPP operation? (LCP Open) (Open: IPCP, CDPCD)
    Both the link-establishment and network-layer phase completed successfully.
  34. Which three statements correctly describe PPP authentication? PAP sends passwords in clear text. - PAP uses a 3-way handshake to establish a link. - PAP provides protection from repeated trial-and-error attacks. - CHAP uses a 2-way handshake to establish a link. - CHAP uses a challenge/response that is based on the MD5 hash algorithm. - CHAP uses repeated challenges for verification.
    PAP sends passwords in clear text. - CHAP uses a challenge/response that is based on the MD5 hash algorithm. - CHAP uses repeated challenges for verification.
  35. Which authentication protocol can be spoofed to allow playback attacks? MD5 - CHAP - PAP - NCP
    PAP
  36. Refer to the exhibit. What statement is true regarding the output shown? (Encapsulation PPP, LCP Open) (Open IPCP, CCP, CDCP, loopback not set) LCP is in the process of negotiating a link. - LCP and NCP are waiting for CHAP authentication to complete. - LCP negotiation has been successful, but NCP negotiation is in progress. - Data is able to flow across this link.
    Data is able to flow across this link.
  37. Refer to the exhibit. What statement is true regarding the output shown? (LCP: I CONFREQ [ACKrcvd] id 8 len 14) (LCP: AuthProto PAP) (LCP MagicNumber) (LCP: 0 CONFNAK [ACKrvcd] is 8 len 9) (LCP: AuthProto CHAP) NCP has successfully negotiated. - The PAP passwords did not match, so the routers are trying CHAP authentication. - One router has suggested PAP authentication, and the other has accepted authentication but suggested CHAP - authentication. - One router can only use PAP authentication while the other router can only use CHAP, so the connection has been rejected.
    One router has suggested PAP authentication, and the other has accepted authentication but suggested CHAP authentication.
  38. Refer to the exhibit. Which two statements are true regarding the output shown? (ppp: ipcp_reqci: returning CONFACK) The router has agreed on IP parameters. - The router has negotiated LCP successfully. - The router is negotiating IP compression options. - The router is requesting an IP address from its peer. - The router has accepted IP but not the suggested IP options.
    The router has agreed on IP parameters. - The router has negotiated LCP successfully.
  39. What advantage does PPP have over HDLC for serial communications? It can communicate more efficiently with other Cisco devices - It is less complex to configure - It has less Layer 2 overhead - It supports authentication
    It supports authentication
  40. Refer to the exhibit. While troubleshooting a serial interface, a technician enters the command show interface serial 0/0/0 . If the interface is in DCE mode, what two problems are likely tocause the indicated problem? (s0/0/0 is up, line protocol is down) The remote CSU or DSU has failed. - The router is not sensing a CD signal. - A timing problem has occurred on the cable. - The line is not physically connected to the CSU/DSU. - The router configuration contains the shutdown interface configuration command.
    The remote CSU or DSU has failed. - A timing problem has occurred on the cable.
  41. Refer to the exhibit. What can be concluded about the function of the Serial 0/0/0 interface on the router after the commands are entered? (ppp quality 90)
    The serial link will be closed if the number of received packets at the destination node falls below 90 percent of the packets that are sent.
  42. Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service? Customers can define their virtual circuit needs in far greater combinations, with increments as small as 64 kbps. - Customers pay for an end-to-end connection that includes the local loop and the network link. - Customers only pay for the local loop and the bandwidth they purchase from the network provider. - Connecting new sites requires new lower cost circuit installations when compared to ISDN dialup costs or adding additional hardware for leased service.
    Customers only pay for the local loop and the bandwidth they purchase from the network provider.
  43. What two methods does Frame Relay technology use to process frames that contain errors? Frame Relay services depend on the upper layer protocols to handle error recovery. - It requires the receiving device to request that the sender retransmit erroneous frames. - FECN, BECN, and DE bits are set in the frames to minimize errors. - The receiving device drops any frames that contain errors without notifying the sender. - The frame relay switch notifies the sender that errors were detected.
    Frame Relay services depend on the upper layer protocols to handle error recovery. - The receiving device drops any frames that contain errors without notifying the sender.
  44. What best describes the use of a data-link connection identifier (DLCI)? local address identifying a destination router across a Frame Relay network - locally significant address used to identify a virtual circuit - logical address identifying the interface between a router and a Frame Relay switch - logical address used to identify the DCE
    locally significant address used to identify a virtual circuit
  45. What is created between two DTEs in a Frame Relay network? ISDN circuit - limited access circuit - switched parallel circuit - virtual circuit
    virtual circuit
  46. Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? ARP - RARP - Proxy ARP - Inverse ARP - LMI status messages - ICMP
    Inverse ARP - LMI status messages
  47. Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the router? (interface s0/0.110 point-to-point) It helps to conserve IP addresses. - It establishes multiple PVC connections to multiple physical interfaces. - It eliminates split horizon issues without increasing the likelihood of routing loops. - It requires the configuration of the encapsulation command on the subinterface.
    It eliminates split horizon issues without increasing the likelihood of routing loops.
  48. Which three actions might a Frame Relay switch perform when it detects an excessive build-up of frames in its queue? puts a hold on accepting frames in excess of the CIR - drops frames from the queue that have the DE bit set - reduces the number of frames it sends over the link - re-negotiates flow control with the connected device - sets the FECN bit on all frames it receives on the congested link - sets the BECN bit on all frames it places on the congested link
    drops frames from the queue that have the DE bit set - sets the FECN bit on all frames it receives on the congested link - sets the BECN bit on all frames it places on the congested link
  49. Refer to the exhibit. Which two statements are true given the output shown? (show frame-relay map) (serial 1/2 [up]: ip 172.16.1.4 dlci 401 [0x191,0x6410], dynamic, broad ast,,status defined, active) The IP address of the local Frame Relay interface is 172.16.1.4. - The local DLCI number is 401. - Inverse ARP is being used on this connection. - This interface is in the active state and in the process of negotiating configuration parameters. - Multicast is not enabled on this connection.
    The local DLCI number is 401. - Inverse ARP is being used on this connection.
  50. Which Frame Relay topology is a compromise of costs, reliability, and complexity when the WAN contains one headquarters site, 40 regional sites, and several sites within each regional site? star - full mesh - partial mesh - point-to-multipoint - point-to-point
    partial mesh
  51. Which statement about Frame Relay subinterfaces is correct? Multipoint interfaces will automatically forward routing broadcasts but will consume more IP addresses than point-to-point subinterfaces will consume. - Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues. - Interfaces with multiple PVCs require a separate subinterface for each PVC. - Multipoint configurations cannot use subinterfaces.
    Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.
  52. What consideration must be taken into account if RIP is used on Frame Relay multiaccess networks? To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword. - Inverse ARP must be enabled to turn routing update broadcasts into unicast traffic that can be propagated to other Frame Relay nodes. - Because broadcast traffic is not supported, RIPv1 cannot be implemented on Frame Relay networks. - To forward broadcast routing updates, dynamic mapping must be enabled.
    To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword.

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