The Candid Test On CCNA 4 Chapter 3
The Connecting Networks course discusses the WAN technologies and network services required by converged applications in a complex network. This is what we covered in CCNA 4 chapter 3 and if you are looking for revision material the test below is perfect for you. Give it a try and see how much you recall.
- 1.
What is created between two DTEs in a Frame Relay network?
- A.
ISDN circuit
- B.
Limited access circuit
- C.
Switched parallel circuit
- D.
Virtual circuit
Correct Answer
D. Virtual circuitExplanation
In a Frame Relay network, a virtual circuit is created between two DTEs. A virtual circuit is a logical connection that allows data to be transmitted between the two devices. It provides a reliable and efficient communication path by dividing the physical network into logical channels. This enables the network to handle multiple connections simultaneously and efficiently allocate bandwidth to each connection.Rate this question:
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- 2.
Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service?
- A.
Customers can define their virtual circuit needs in far greater combinations, with increments as small as 64 kbps.
- B.
Customers pay for an end-to-end connection that includes the local loop and the network link.
- C.
Customers only pay for the local loop and the bandwidth they purchase from the network provider
- D.
Connecting new sites requires new lower cost circuit installations when compared to ISDN dialup costs or adding additional
- E.
Hardware for leased service.
Correct Answer
C. Customers only pay for the local loop and the bandwidth they purchase from the network providerExplanation
The benefit of using Frame Relay instead of a leased line or ISDN service is that customers only have to pay for the local loop and the bandwidth they purchase from the network provider. This means that customers can save money by only paying for the specific resources they need, rather than paying for a more expensive end-to-end connection that includes the local loop and the network link. Additionally, connecting new sites is more cost-effective with Frame Relay compared to ISDN dialup or leased service, as it requires lower cost circuit installations.Rate this question:
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- 3.
3. What best describes the use of a data-link connection identifier (DLCI)?
- A.
Local address identifying a destination router across a Frame Relay network
- B.
Locally significant address used to identify a virtual circuit
- C.
Logical address identifying the interface between a router and a Frame Relay switch
- D.
Logical address used to identify the DCE
Correct Answer
B. Locally significant address used to identify a virtual circuitExplanation
A DLCI (Data-Link Connection Identifier) is a locally significant address used to identify a virtual circuit. It is used in Frame Relay networks to establish connections between devices. The DLCI serves as a label for the virtual circuit, allowing the devices to communicate with each other. This address is only relevant within the local network and does not have any significance outside of it.Rate this question:
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- 4.
Refer to the exhibit. A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI will be used to send the ping?
- A.
110
- B.
115
- C.
220
- D.
225
Correct Answer
A. 110Explanation
Based on the exhibit, the ping is being sent from the Peanut router. To determine the DLCI that will be used, we need to look at the mapping between the IP address and DLCI in the exhibit. Since the IP address 192.168.50.10 is mapped to DLCI 110, the ping will be sent using DLCI 110.Rate this question:
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- 5.
Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the •router?
- A.
It helps to conserve IP addresses.
- B.
It establishes multiple PVC connections to multiple physical interfaces.
- C.
It eliminates split horizon issues without increasing the likelihood of routing loops.
- D.
It requires the configuration of the encapsulation command on the subinterface.
Correct Answer
C. It eliminates split horizon issues without increasing the likelihood of routing loops.Explanation
The point-to-point configuration on subinterface S0/0.110 eliminates split horizon issues without increasing the likelihood of routing loops. Split horizon is a technique used in routing protocols to prevent a route learned on one interface from being advertised back out the same interface. In a point-to-point configuration, there is only one possible path between two devices, so there is no need for split horizon. This configuration ensures that routing updates are properly propagated without causing loops in the network.Rate this question:
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- 6.
Refer to the exhibit. What can be determined about the Frame Relay switch from the output shown?
- A.
• It is currently not transmitting data.
- B.
It is in the process of establishing the PVC.
- C.
It has put a hold on processing frames in excess of the CIR.
- D.
It is experiencing congestion.
Correct Answer
D. It is experiencing congestion.Explanation
The output shown indicates that the Frame Relay switch has put a hold on processing frames in excess of the Committed Information Rate (CIR). This suggests that the switch is experiencing congestion, as it is unable to process frames beyond the specified rate.Rate this question:
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- 7.
Refer to the exhibit. What can be known about the configuration of router R1 from the output??
- A.
LMI updates are not being received properly.
- B.
The LMI type for the Serial 0/0/0 interface has been left to its default configuration.
- C.
Cisco HDLC is used as a Layer 2 encapsulation protocol on the Serial 0/0/0 interface.
- D.
The Serial 0/0/0 interface has been configured as a data communications equipment device
Correct Answer
B. The LMI type for the Serial 0/0/0 interface has been left to its default configuration.Explanation
From the output, it can be inferred that the LMI type for the Serial 0/0/0 interface on router R1 has not been changed from its default configuration. This suggests that the LMI updates are not being received properly, as indicated in the first statement. The other options mentioned in the exhibit do not provide any information about the LMI updates or the configuration of the router.Rate this question:
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- 8.
Refer to the exhibit. What can be determined from the output?
- A.
Serial 0/0/0 has been configured with an DLCI of 201
- B.
Serial 0/0/0 has the feature frame-relay inverse-arp enabled.
- C.
Serial 0/0/0 has been configured with an IP address of 172.16.4.3.
- D.
Serial 0/0/0 has been configured with the command frame-relay map ip 172.16.4.3 201 broadcast
Correct Answer
B. Serial 0/0/0 has the feature frame-relay inverse-arp enabled.Explanation
From the given output, it can be determined that Serial 0/0/0 has the feature frame-relay inverse-arp enabled. This is indicated by the presence of the command "frame-relay map ip 172.16.4.3 201 broadcast" in the configuration, which is used to enable inverse ARP in a frame-relay network. Inverse ARP is a technique used to dynamically map DLCIs to IP addresses, allowing devices to automatically discover the mapping between DLCIs and IP addresses in a frame-relay network.Rate this question:
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- 9.
Refer to the exhibit. What can be known about the configuration of router R1 from the output?
- A.
The Frame Relay LMI DLCI has been incorrectly configured as DLCI 1023.
- B.
The Frame Relay LMI type has been changed from its default.
- C.
The Serial 0/0/0 interface has been configured as a data communication
- D.
The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface
Correct Answer
D. The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interfaceExplanation
The output indicates that the command "encapsulation frame-relay ietf" has been used on the Serial 0/0/0 interface of router R1. This command is used to configure the encapsulation type for the Frame Relay protocol.Rate this question:
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- 10.
7. Refer to the exhibit. Which two outcomes occur from the configuration shown? (Choose two.)
- A.
The broadcasts will be forwarded to 10.1.1.1
- B.
The router will use DLCI 22 to forward data to 10.1.1.1.
- C.
DLCI 22 will replace the MAC address in the ARP table for entry 10.1.1.1
- D.
Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.
- E.
Inverse-ARP will now add an entry for 10.1.1.1 into the Frame Relay map table using DLCI 22.
Correct Answer(s)
B. The router will use DLCI 22 to forward data to 10.1.1.1.
D. Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.Explanation
The configuration shown indicates that DLCI 22 is being used to forward data to 10.1.1.1. This means that the router will use DLCI 22 to send data packets to the destination IP address 10.1.1.1. Additionally, frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22. This means that the frames received on this interface will have a source address of DLCI 22.Rate this question:
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- 11.
Refer to the exhibit. Which two statements are true given the output shown? (Choose two.)
- A.
The IP address of the local Frame Relay interface is 172.16.1.4.
- B.
The local DLCI number is 401.
- C.
Inverse ARP is being used on this connection.
- D.
This interface is in the active state and in the process of negotiating configuration parameters.
- E.
Multicast is not enabled on this connection.
Correct Answer(s)
B. The local DLCI number is 401.
C. Inverse ARP is being used on this connection.Explanation
The exhibit does not provide any information about the IP address of the local Frame Relay interface, so the statement "The IP address of the local Frame Relay interface is 172.16.1.4" cannot be determined from the given output. However, the output does show that the local DLCI number is 401 and that Inverse ARP is being used on this connection. Therefore, the statements "The local DLCI number is 401" and "Inverse ARP is being used on this connection" are both true based on the given output.Rate this question:
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- 12.
Refer to the exhibit. Router R2 is part of a Frame Relay network that uses OSPF for IP routing. After the commands that are shown are entered, R2 will not exchange OSPF information correctly. What is the likely cause?
- A.
The frame-relay map command requires the broadcast keyword.
- B.
The DLCIs on each end of the PVCs are not identical.
- C.
The R2 S0/0/0 interface has not been brought online
- D.
The LMI or Inverse ARP or both are not working.
Correct Answer
A. The frame-relay map command requires the broadcast keyword.Explanation
The likely cause for R2 not exchanging OSPF information correctly is that the frame-relay map command requires the broadcast keyword. This means that the command entered for the frame-relay map is missing the broadcast keyword, which is necessary for OSPF information to be properly exchanged.Rate this question:
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- 13.
.Which statement about Frame Relay subinterfaces is correct?
- A.
Multipoint interfaces will automatically forward routing broadcasts but will consume more IP addresses than point-to-point
- B.
Subinterfaces will consume.
- C.
Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.
- D.
Interfaces with multiple PVCs require a separate subinterface for each PVC.
- E.
Multipoint configurations cannot use subinterfaces.
Correct Answer
C. Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.Explanation
Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues. This means that when using point-to-point subinterfaces, there is no need to worry about split-horizon routing, which is a technique used to prevent routing loops in certain network topologies. Additionally, point-to-point subinterfaces provide a dedicated connection between two endpoints, similar to leased lines, ensuring a more reliable and efficient communication compared to multipoint interfaces.Rate this question:
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- 14.
Refer to the exhibit. Which statement explains why the Frame Relay connection between R1 and R2 is failing?
- A.
Split horizon must be disabled
- B.
The LMI type must be specified.
- C.
Logical subinterfaces must be used instead.
- D.
The frame-relay map commands are using incorrect DLCIs.
Correct Answer
D. The frame-relay map commands are using incorrect DLCIs.Explanation
The frame-relay map commands are using incorrect DLCIs. This means that the DLCI values specified in the frame-relay map commands on R1 and R2 do not match, causing the Frame Relay connection between the two routers to fail. The DLCI (Data Link Connection Identifier) is used to identify the virtual circuit between the routers in a Frame Relay network. If the DLCI values are incorrect, the routers will not be able to establish a successful connection.Rate this question:
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