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Added line is this color Deleted line is this color +CCNA3 TEST & ANSWER ---SEM4 CH5 + + + + +1 A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI will be used to send the ping? + + 110 √ + 115 + 220 + 225 + + + + +2 Which methods are used to minimize heavy traffic on a Frame Relay network? (Choose two.) + + FRADs or routers set ECN bits to request that the Frame Relay switch reduce the flow of frames on the link. + Windowing is used to reduce the size of the frames sent across the link. + The Frame Relay switch will drop low priority packets that have the DE bit set. √ + When a switch sees its queue increasing, it notifies DTEs to reduce the flow of traffic. √ + If congestion occurs, all frames are dropped until the congestion clears. + + + + +3 What is the purpose of the FCS field in a Frame Relay frame? + + It serves to distinguish one frame from the next. + It is used to signal network congestion. + It is used to detect if the frame has been corrupted and should be discarded. √ + It determines which VC should be used for transmission. + + + + +4 What does a DLCI of 1023 indicate about a frame? + + The LMI type is ANSI. + The LMI type is IETF. + The LMI type is Cisco.√ + The LMI type is Q933a. + The encapsulation is Cisco. + The encapsulation is IETF. + + + + +5 Which of the following DLCIs are reserved? + + 16 + 127 + 255 + 1023 √ + 2048 + + + + +6 Which of the following allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose two.) + + ARP + RARP + Proxy ARP + Inverse ARP √ + LMI status messages √ + ICMP + + + + +7 What is created between two DTEs in a Frame Relay network? + + switched parallel circuit + permanent virtual circuit √ + limited access circuit + ISDN circuit + Frame Relay circuit + + + + +8 Which statement identifies a reason for using subinterfaces in Frame Relay networks? + + Subinterfaces overcome routing update and split-horizon issues that occur with multipoint physical interfaces. √ + A subinterface does not require an IP address and therefore saves address space. + Multipoint subinterfaces override the split-horizon rules and allow broadcast traffic to be forwarded by default. + Subinterfaces provide greater reliability and reachability in Frame Relay networks by requiring a mesh topology for network configurations. + Subinterfaces increase the number of DLCIs that can be configured in a Frame Relay network. + + + + +9 Which features make Frame Relay technology a cost-effective alternative to a mesh of access lines? (Choose three.) + + allows a single interface to support multiple PVCs √ + minimizes the equipment required to be purchased by the customer √ + requires one router interface for each PVC + allows the customer to do dial on demand routing over analog lines rather than paying for access lines + allows the customer to pay for the average bandwidth requirement rather than the maximum bandwidth requirement √ + + + + +10 Which commands were added to the configuration to produce the output shown in the graphic? (Choose two.) + + Router(config)# ip route 192.168.192.4 255.255.255.0 17 broadcast + Router(config-if)# frame-relay lmi-type cisco 17 + Router(config-if)# frame-relay map ip 192.168.192.4 17 broadcast √ + Router(config-if)# ip address 192.168.192.4 255.255.255.0 DLCI 17 static + Router(config-if)# interface S0/0.1 point-to-point + Router(config-if)# encapsulation frame-relay cisco √ + + + + +11 Which of the following statements are true about a basic Frame Relay WAN connection between a customer and the service provider? (Choose two.) + + DTE devices such as routers and FRADs transmit user data. √ + DTE devices such as Frame Relay switches transport the data between DTE devices. + An Ethernet connection between the router and the frame relay switch allow access to the frame relay network. + Serial connections between the customer and the frame relay network are used to transport data. √ + The Frame Relay WAN is a mesh of interconnected routers. + + + + +12 How does Frame Relay technology process frames that contain errors? (Choose two.) + + 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. + + + + +13 Why are full mesh topologies seldom found in large Frame Relay networks? + + Additional hardware is required to achieve the mesh. + The additional virtual circuits slow the link access speeds. + The required number of links becomes prohibitive. √ + Additional interfaces are required since each can only support 10 virtual circuits. + The speed of transmission slows in inverse proportion to the square of the number of links. + + + + +14 Which bits are set in the data frames to request that a device reduce the flow of data sent to or from a Frame Relay switch? + + EIR bits + ECN bits √ + CIR bits + DE bits + Window bits + + + + +15 Which data link layer protocol is used to carry frames across a Frame Relay link? + + HDLC + PPP + LAPD + LAPF √ + Frame Relay + + + + +16 When troubleshooting a frame relay connection, a technician entered the show frame-relay pvc command shown in the graphic. What can be concluded from the output shown in the graphic? (Choose three.) + + The output in the debug frame-relay lmi command will indicate status 0x2 for DLCI 18. √ + DLCI 16 was programmed on the switch, but the remote router may be misconfigured. √ + The frame relay switch is sending LMI status messages about DLCI 16 to the Singapore router. √ + Congestion has been experienced on DLCI 18. + Some packets have been set to be dropped if congestion is experienced on the PVC. + + + + +17 When troubleshooting a frame-relay connection, an administrator entered the show interface s0/0 command and received the output shown in the graphic. The line protocol is down. Which of the following are possible reasons for this problem? (Choose two.) + + The cable between the CSU/DSU and the router is disconnected. + The serial 0/0 interface is shutdown. + The frame-relay switch is not advertising the correct PVCs. √ + The LMI type on the frame-relay switch is Cisco. √ + The address of the frame-relay switch is not in the routing table. + + + + +18 Which of the following statements regarding multipoint subinterfaces are true? (Choose two.) + + A single multipoint subinterface is used to establish PVC connections to multiple physical interfaces on remote routers.√ + Each multipoint link is in its own subnet. + The physical interface does not have an IP address. √ + Split-horizon is disabled allowing routing updates to be re-transmitted on every subinterface. + Multipoint subinterfaces require the encapsulation frame-relay command to be issued individually for each subinterface to operate correctly. + + + + +19 Which of the following occurs when the command frame-relay map ip 10.1.1.1 22 is configured on the router? (Choose two.) + + DLCI 22 will replace the MAC address in the ARP table for entry 10.1.1.1 + The remote circuit with DLCI 22 can receive a ping. + Inverse-ARP will be used to add an entry for 10.1.1.1 into the frame-relay map table using DLCI 22. + Pings to 10.1.1.1 will be sent on the circuit labeled DLCI 22. √ + The router will use DLCI 22 to forward data to 10.1.1.1. √ + + + + +20 How is a permanent virtual circuit defined in a Frame Relay network that is carrying IP traffic? + + It is given a fixed locally significant identification number. √ + It has a specific IP address. + It is identified by the MAC address of the router interface. + Dynamic virtual channel identifiers are assigned to each frame transmitted across the network. + The service provider assigns a terminal endpoint identifier to the switch port. + + + + +21 Which of the following are LMI extensions? (Choose two.) + + broadcasting of frames + PVC status messages √ + call tear down + simple flow control √ + congestion avoidance + frame discarding |