CCNA Discovery 3 Module 7

CCNA Discovery 3 Module 7 Exam Answers Version 4.0
1. Why are Network Control Protocols used in PPP?
• to allow multiple Layer 3 protocols to operate over the same physical link

2. What is the data transmission rate for the DS0 standard?
• 64 kb/s

3. In which two layers of the OSI model are key differences found between a LAN and a WAN. (Choose two.)
• Layer 1
• Layer 2

4. Which statement is true about the Cisco implementation of the HDLC protocol?
• It is the default encapsulation for serial interfaces on Cisco routers.

5.

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Refer to the exhibit. A network administrator has a connectivity problem between the serial interfaces of Merida and Vargas. What is the cause of the problem?
• The encapsulation is misconfigured.

6.

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Refer to the exhibit. What statement is true about the exhibited output?
• LCP and NCP negotiation is complete, and the data link service is available to carry packets.

7. Which three statements are true regarding LCP? (Choose three.)
• 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.

8. Why are Frame Relay paths referred to as virtual?
• The physical circuits inside the Frame Relay cloud do not contain exclusive links for a specific Frame Relay connection.

9. What best describes the use of a data-link connection identifier (DLCI)?
• an address identifying a virtual circuit

10. What two services allow the router to dynamically map data link layer addresses to network layer addresses Frame Relay network? (Choose two.)
• Inverse ARP
• LMI status messages

11. Which three statements describe functions of the Point-to-Point Protocol with regards to the OSI model?(Choose three.)
• provides a mechanism to multiplex several network layer protocols
• can be configured on both synchronous and asynchronous serial interfaces
• uses Layer 3 of the OSI model to establish and maintain a session between devices
• uses network control protocols to test and maintain connectivity between devices

12. At what physical location does the responsibility for a WAN connection change from the user to the service provider?
• demarcation point

13. What does a Frame Relay switch use to inform the sender that there is congestion?
• BECN

14.

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Refer to the exhibit. What statement is true about the debug output?
• The routers have different CHAP passwords configured.

15. Which two statements describe the function of time-division multiplexing? (Choose two.)
• Multiple data streams share one common channel.
• Time slots go unused if a sender has nothing to transmit.

16. When customers use credit cards to make purchases at a small business, a modem is heard dialing a telephone number to transfer the transaction data to the central office. What type of WAN serial connection is in use?
• circuit switched

17. Which best describes data communications equipment (DCE)?
• equipment that forwards data and is responsible for the clocking signal

18. Permanent virtual circuits and switched virtual circuits are both part of which option for WAN connectivity?
• packet switching

19. Which field of a frame uses error detection mechanisms to verify that the frame is not damaged intransit?
• FCS

20. What occurs in the encapsulation process as a data packet moves from a LAN across a WAN?
• The Layer 2 encapsulation changes to a format that is appropriate for the WAN technology.

21.


Refer to the exhibit. The network administrator is configuring R1 to connect to R2, which is a non-Cisco router. Which encapsulation method will need to be configured for communication to occur?
• PPP

22. A company is implementing dialup services for remote workers to connect to the local network. The company uses multiple Layer 3 protocols and requires authentication for security. Which protocol should be used for this remote access?
• PPP

23. Which two options can LCP negotiate? (Choose two.)
• compression
• authentication

24. What statement best describes cell switching?
• It creates fixed-length packets that traverse virtual circuits.