CCNA 4 - Chapter 2 (New version)

1. Which statements are correct regarding ATM connections? (Choose two.)
• uses only PVCs
• is useful for video transfers
• has data rates beyond 155 Mbps
• cells have 32 byte payload and a 5 byte overhead
• mandates single virtual circuits on a single leased line connection

2. Which of the following describes a packet-switched network using connection-oriented data transfer? (Choose two.)
• Each packet carries an identifier.
• Each packet carries full addressing information.
• Each switch in the route must evaluate the addressing information to determine where to send the packet.
• Each switch determines where to send the packet by examining tables in memory.
• The addressing information is used to set switches along the route of data transfer to create a continuous copper circuit.

3. A European company needs a low cost, dialup WAN connection to validate transactions for point-of-sale card readers. Which connection type is commonly used for this situation?
• ATM
• X.25
• Frame Relay
• Leased lines

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4. Which of the following is commonly used as Data Terminal Equipment?
• ISDN
• modem
• router
• CSU/DSU

5. A company requires a WAN connection that will carry 64 kbps and allow fast call setup time. The connection does not need to carry video. What is the best choice for this company?
• ATM
• ISDN BRI
• X.25
• analog dialup

6. Why is it important to identify the type of traffic that will be carried on the WAN links before choosing a WAN technology?
• to determine the routing protocol to be used on the WAN link
• to determine the WAN topology
• to determine the requirements for latency and jitter
• to determine the type of signaling protocol to be used on the WAN link

7. On which of the following are most Layer 2 WAN encapsulations based?
• IP
• PPP
• HDLC
• SLIP
• HSSI
• CSU

8. A company only requires a WAN connection to transfer sales data from individual stores to the home office. All transfers will occur after business hours. They estimate they will never need a connection faster than 56 kbps. Which type of connection is best for this company?
• ATM
• ISDN
• analog dialup
• T1 Leased Line

9. Which of the statements regarding DSL are correct? (Choose three.)
• DSL provides a consistent bandwidth of 2.154 Mbps.
• DSL connections provide a fast dialup to establish a WAN connection.
• DSL connects the local loop to a digital subscriber line access multiplexer.
• DSL bandwidth varies and can exceed the bandwidth of a T1/E1 leased line.
• For DSL to function properly, the local loop must be less than 5.5 kilometers (3.5 miles).
• DSL is a popular choice for enterprises that need to connect home users to the local network due to strong security.

10. Which of the following are disadvantages of circuit-switched networks? (Choose two.)
• Data is subject to unpredictable delays while it waits for other subscribers to transmit data.
• The connection capacity is used inefficiently due to irregular traffic bursts.
• Data delivery is less reliable because only connectionless delivery methods are used.
• Circuit-switched networks are more expensive for data traffic.
• Circuit-switched networks are less expensive for 24/7 data traffic.

11. Depending on the company size and geographical layout, there might be many end points on the company WAN. Why is it important to identify all the end points of the WAN before choosing a WAN design?
• to determine the routing protocol to be used on the WAN link
• to determine the WAN topology
• to determine the requirements for latency and jitter
• to determine the signaling protocol to be used on the WAN link

12. Which of the following is true of WANs?
• Shared network WAN technologies such as Frame Relay and ATM are more expensive but offer less latency and jitter than dedicated lines.
• ISDN is suitable for large enterprises.
• The more network devices that data has to pass
• WANs typically incorporate only one technology such as ISDN, Frame Relay, or ATM.

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13. A new international company needs to have a design for WAN connectivity. The company will have at least five offices in every state in the United States and Mexico. Some states will have as many as 20 offices. The branch offices will require constant contact with the services of the main office. Which design model is best for WAN connectivity in this situation?
• a mesh network of all branch WANs
• a simple star topology connecting all branch LANs to a central router with multiple interfaces
• a one layer design using Frame Relay links between LANs
• a three layer hierarchical topology interconnecting branch LANs within an area, the area LANs within a region, and connecting the regions to form the core of the WAN

14. Which statement is true regarding WAN technologies?
• Most WANS use only one technology throughout the infrastructure such as ISDN, Frame Relay or ATM.
• Data transfer speeds on the WAN are typically faster than the speeds on a LAN.
• WANs operate at the lower three layers of the OSI model.
• WANs are unable to support the transfer of voice or video traffic.

15. A large company already has a T1 leased line but this connection is inadequate at peak business hours. Furthermore, they would like a backup WAN connection in case their leased line temporarily fails. What type of WAN connection is commonly used in this situation?
• X.25
• DSL
• ISDN
• cable modem
• 56 kbps

16. Which term describes the cabling that connects the customer site to the nearest exchange of the WAN service provider?
• CPE
• CO
• local loop
• DCE
• DTE

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17. Which of the following connections will provide the equivalent of a T1/E1 connection and is intended for large businesses?
• BRI
• PRI
• DLCI
• PSTN
• POTS

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CCNA4 MODULE 2 100/100

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CCNA4 v 4.0 Exam chapter 2 PPP

1. Which two statements are true about time-division multiplexing (TDM)? (Choose two.)

	TDM relies on Layer 3 protocols to operate.
	Multiple sources can transmit over a single channel.
	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.

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2. 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

3. 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

4. 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.

5. Which three statements are correct about HDLC encapsulation? (Choose three.)

	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.

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

	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.

7. Which two options can LCP negotiate? (Choose two.)

	link quality
	authentication
	dynamic flow control
	compression and network layer address for IP
	connection-oriented or connectionless communication methods

8. Which PPP configuration option can be used to establish load balancing over the interfaces of a router?

	callback
	multilink
	compression
	error detection

9. 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

10. Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established?

	one
	two
	three
	four

11. Refer to the exhibit. Which statement is true about PPP operation?

	Layer 2 is down.
	LCP, IPCP, and CDPCP negotiations are in progress.
	Only the link-establishment phase completed successfully.
	Both the link-establishment and network-layer phase completed successfully.

12. Which three statements correctly describe PPP authentication? (Choose three.)

	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.

13. Which authentication protocol can be spoofed to allow playback attacks?

	MD5
	CHAP
	PAP
	NCP

14. Refer to the exhibit. What statement is true regarding the output shown?

	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.

15. Refer to the exhibit. What statement is true regarding the output shown?

	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.

16. Refer to the exhibit. Which two statements are true regarding the output shown? (Choose two.)

	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.

17. 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

18. 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 to cause the indicated problem? (Choose two.)

	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.

19. Refer to the exhibit. Router R1, the DCE device, has just been configured for PPP encapsulation with authentication. What series of commands will allow another router, the DTE device, to communicate over its serial 0/0/0 interface to router R1?

	Router(config)# hostname R3 R3(config)# username R1 password Cisco R3(config)# interface Serial 0/0/0 R3(config-if)# encapsulation ppp R3(config-if)# ip address 172.16.3.3 255.255.255.0 R3(config-if)# ppp authentication chap
	Router(config)# hostname R3 R3(config)# username R3 password Cisco R3(config)# interface Serial 0/0/0 R3(config-if)# encapsulation ppp R3(config-if)# ip address 172.16.3.3 255.255.255.0 R3(config-if)# ppp authentication chap
	Router (config)# username Router password Cisco Router (config)# interface Serial 0/0/0 Router (config-if)# clockrate 64000 Router (config-if)# encapsulation ppp Router (config-if)# ip address 172.16.3.1 255.255.255.0 Router config-if)# ppp authentication chap
	Router (config)# username R1 password Cisco Router config)# interface Serial 0/0/0 Router (config-if)# clockrate 64000 Router config-if)# encapsulation ppp Router (config-if)# ip address 172.16.3.1 255.255.255.0 Router (config-if)# ppp authentication chap

20. Refer to the exhibit. Router R1 is not able to communicate with a neighbor router that is directly connected to serial 0/0/0. What is the reason for this?

	Interface Serial0/0/0 resets very frequently.
	PPP LQM has shutdown the serial interface.
	The serial interface has no input or output queues available.
	The serial interface is not configured for a Layer 2 protocol.
	The interface has been administratively shutdown with the shutdown command.

21. 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?

	All username and password information that is sent will be encrypted.
	All authentication on the serial link will be accomplished using a three-way handshake.
	The Predictor algorithm will be used to compress all packets that are sent and received on the serial link.
	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.

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