A Unique Quiz On Ccna4 Chapter 2
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Which two statements are true about time-division multiplexing (TDM)? (Choose two.)
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TDM relies on Layer 3 protocols to operate.
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Multiple channels can transmit over a single link.
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Original data streams must be reconstructed at the destination.
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TDM methods vary depending on the Layer 2 protocol that is used.
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It allows information from multiple channels to be allocated bandwidth on multiple wires.
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Welcome to a unique quiz which aims to boost some of your knowledge regarding your ongoing studies towards the Cisco Certified Network Associate – a certification which will ultimately allow you multiple career opportunities in engineering, system administration, IT management and more!
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- 2.
What does the demarcation point represent in data communication physical circuits?
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DTE/DCE interface on the device connecting to the Internet
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Location of the firewall or router
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Physical point at which the public network ends and the private customer network begins
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Tag assigned to the physical block where a cross-connect occurs
Correct Answer
A. Physical point at which the public network ends and the private customer network beginsExplanation
The demarcation point represents the physical point at which the public network ends and the private customer network begins in data communication physical circuits. This is the point where the responsibility for the network shifts from the service provider to the customer. It is typically located at the customer premises and marks the boundary between the two networks.Rate this question:
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- 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?
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EIA/TIA 232 (RS-232)
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EIA/TIA 422 (RS-422)
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EIA/TIA 423 (RS-423)
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EIA/TIA-612/613 (HSSI)
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ITU V.35
Correct Answer(s)
A. EIA/TIA 422 (RS-422)
A. EIA/TIA-612/613 (HSSI)Explanation
The correct answer is EIA/TIA 422 (RS-422) and EIA/TIA-612/613 (HSSI). EIA/TIA 422 (RS-422) is a serial communications interface standard that provides high-speed connectivity between LANs. It is commonly found on high-end Cisco routers. EIA/TIA-612/613 (HSSI) is another serial communications interface standard that also provides high-speed connectivity and is commonly found on Cisco routers. Both standards support high data rates, making them suitable for connecting LANs at speeds of up to 52 Mbps.Rate this question:
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- 4.
Why are serial connections preferred over parallel connections for long transmission lengths?
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Parallel connections do not support error checking.
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Parallel connections are subject to excessive attenuation.
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Parallel connections are subject to clock skew and to crosstalk between wires.
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Parallel connections transmit over only two wires and therefore transmit data more slowly.
Correct Answer
A. Parallel connections are subject to clock skew and to crosstalk between wires.Explanation
Parallel connections are subject to clock skew and crosstalk between wires. Clock skew refers to the difference in arrival times of signals in a parallel connection, which can lead to synchronization issues. Crosstalk occurs when signals from one wire interfere with signals on adjacent wires, causing errors in data transmission. These issues make parallel connections less reliable for long transmission lengths compared to serial connections.Rate this question:
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- 5.
Which three statements are correct about HDLC encapsulation? (Choose three.)
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HDLC does not support CDP.
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HDLC and PPP are compatible.P.
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HDLC supports PAP and CHAP authentication.
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HDLC implementation in Cisco routers is proprietary.
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HDLC is the default serial interface encapsulation on Cisco routers.
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HDLC uses frame delimiters to mark the beginnings and ends of frames.
Correct Answer(s)
A. HDLC implementation in Cisco routers is proprietary.
A. HDLC is the default serial interface encapsulation on Cisco routers.
A. HDLC uses frame delimiters to mark the beginnings and ends of frames.Explanation
HDLC implementation in Cisco routers is proprietary means that Cisco routers use their own implementation of HDLC, which may not be compatible with other vendors' devices. HDLC is the default serial interface encapsulation on Cisco routers indicates that when a serial interface is configured on a Cisco router, HDLC is automatically used as the encapsulation method. HDLC uses frame delimiters to mark the beginnings and ends of frames means that HDLC uses specific characters to indicate the start and end of a frame, allowing the receiver to correctly interpret the data.Rate this question:
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- 6.
Which three statements are true regarding LCP? (Choose three.)
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It is responsible for negotiating link establishment.
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It negotiates options for Layer 3 protocols running over PPP.
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It uses MD5 encryption while negotiating link establishment parameters.
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It terminates the link upon user request or the expiration of an inactivity timer.
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It can test the link to determine if link quality is sufficient to bring up the link.
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It monitors the link for congestion and dynamically adjusts the acceptable window size.
Correct Answer(s)
A. It is responsible for negotiating link establishment.
A. It terminates the link upon user request or the expiration of an inactivity timer.
A. It can test the link to determine if link quality is sufficient to bring up the link.Explanation
LCP (Link Control Protocol) is responsible for negotiating link establishment, meaning it handles the process of establishing a connection between two devices. It also terminates the link upon user request or when an inactivity timer expires, ensuring that the connection is closed when necessary. Additionally, LCP can test the link to determine if the link quality is sufficient to establish a connection, allowing it to assess whether the link is stable and reliable.Rate this question:
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- 7.
Which two options can LCP negotiate? (Choose two.)
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Link quality
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Authentication
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Dynamic flow control
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Compression and network layer address for IP
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Connection-oriented or connectionless communication methods
Correct Answer(s)
A. Link quality
A. AuthenticationExplanation
LCP (Link Control Protocol) can negotiate link quality and authentication options. Link quality negotiation allows devices to determine the quality of the connection and adjust parameters accordingly. Authentication negotiation ensures that both devices can verify each other's identities before establishing a connection.Rate this question:
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- 8.
Which PPP configuration option can be used to establish load balancing over the interfaces of a router?
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Callback
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Multilink
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Compression
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Error detection
Correct Answer
A. MultilinkExplanation
Multilink is the correct answer because it allows load balancing over the interfaces of a router. With multilink, multiple physical links are combined into a single logical link, increasing the overall bandwidth and enabling load balancing across the interfaces. This is achieved by distributing traffic across the available links, thereby optimizing the utilization of resources and improving network performance.Rate this question:
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- 9.
What function do Network Control Protocols provide for a PPP connection
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To supply error detection
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To establish and terminate data links
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To provide authentication capabilities to PPP
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To manage network congestion and to allow quality testing of the link
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To allow multiple Layer 3 protocols to operate over the same physical link
Correct Answer
A. To allow multiple Layer 3 protocols to operate over the same physical linkExplanation
Network Control Protocols (NCPs) provide the function of allowing multiple Layer 3 protocols to operate over the same physical link. This means that NCPs enable the transmission of different network protocols, such as IP, IPX, or AppleTalk, over a single PPP connection. By supporting multiple Layer 3 protocols, NCPs enhance the flexibility and efficiency of network communications, allowing different devices and networks to communicate seamlessly over the same physical link.Rate this question:
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- 10.
Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established?
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1
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2
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3
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4
Correct Answer
A. 2Explanation
Based on the exhibit, the output shows that there are two NCP (Network Control Protocol) sessions established on the Serial0/0 interface. The "NCP Open" line indicates the number of NCP sessions that have been successfully opened, which in this case is 2. Therefore, the correct answer is 2.Rate this question:
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- 11.
Refer to the exhibit. Which statement is true about PPP operation?
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Layer 2 is down.
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LCP, IPCP, and CDPCP negotiations are in progress.
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Only the link-establishment phase completed successfully.
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Both the link-establishment and network-layer phase completed successfully.
Correct Answer
A. Both the link-establishment and network-layer phase completed successfully.Explanation
The given exhibit does not provide any information about the status of Layer 2. However, it does mention that LCP, IPCP, and CDPCP negotiations are in progress, indicating that the link-establishment phase is ongoing. Additionally, it does not mention that only the link-establishment phase has completed successfully, but rather states that both the link-establishment and network-layer phase have completed successfully. Therefore, the correct answer is that both the link-establishment and network-layer phase completed successfully.Rate this question:
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- 12.
Which three statements correctly describe PPP authentication? (Choose three
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PAP sends passwords in clear text.
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PAP uses a 3-way handshake to establish
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PAP provides protection from repeated trial-and-error attacks.
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CHAP uses a 2-way handshake to establish a link
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CHAP uses a challenge/response that is based on the MD5 hash algorithm
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CHAP uses repeated challenges for verification.
Correct Answer(s)
A. PAP sends passwords in clear text.
A. CHAP uses a challenge/response that is based on the MD5 hash algorithm
A. CHAP uses repeated challenges for verification.Explanation
PAP sends passwords in clear text, which means that the password is not encrypted and can be easily intercepted. CHAP uses a challenge/response that is based on the MD5 hash algorithm, which provides a more secure authentication process by encrypting the password. Additionally, CHAP uses repeated challenges for verification, ensuring that the connection remains secure throughout the session.Rate this question:
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- 13.
Which authentication protocol can be spoofed to allow playback attacks?
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MD5
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CHAP
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PAP
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NCP
Correct Answer
A. PAPExplanation
PAP (Password Authentication Protocol) can be spoofed to allow playback attacks. PAP sends passwords in clear text, making it vulnerable to interception and replay attacks. In a playback attack, an attacker intercepts the authentication process and replays the captured data to gain unauthorized access. Since PAP does not use encryption or mutual authentication, it is susceptible to spoofing and unauthorized access.Rate this question:
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- 14.
Refer to the exhibit. What statement is true regarding the output shown?
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LCP is in the process of negotiating a link.
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LCP and NCP are waiting for CHAP authentication to complete
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LCP negotiation has been successful, but NCP negotiation is in progress.
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Data is able to flow across this link.
Correct Answer
A. Data is able to flow across this link.Explanation
The output shown indicates that the LCP negotiation has been successful, which means that the link has been established and is ready to transmit data. The fact that the NCP negotiation is still in progress does not affect the ability of data to flow across the link. Therefore, the statement "Data is able to flow across this link" is true based on the given information.Rate this question:
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- 15.
Refer to the exhibit. What statement is true regarding the output shown?
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NCP has successfully negotiated
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The PAP passwords did not match, so the routers are trying CHAP authentication.
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One router has suggested PAP authentication, and the other has accepted
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Authentication but suggested CHAP authentication.
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One router can only use PAP authentication while the other router can only use
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CHAP, so the connection has been rejected.
Correct Answer
A. One router has suggested PAP authentication, and the other has acceptedExplanation
authentication but suggested CHAP authentication.Rate this question:
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- 16.
Refer to the exhibit. Which two statements are true regarding the output shown? Choose two.)
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The router has agreed on IP parameters
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The router has negotiated LCP successfully.
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The router is negotiating IP compression options.
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The router is requesting an IP address from its peer.
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The router has accepted IP but not the suggested IP options.
Correct Answer(s)
A. The router has agreed on IP parameters
A. The router has negotiated LCP successfully.Explanation
The output shown indicates that the router has agreed on IP parameters because the line "IP address 192.168.1.1, subnet mask 255.255.255.0" confirms that the router has successfully negotiated an IP address and subnet mask. Additionally, the line "LCP is Open" indicates that the router has negotiated LCP (Link Control Protocol) successfully. Therefore, the correct statements are that the router has agreed on IP parameters and has negotiated LCP successfully.Rate this question:
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- 17.
What advantage does PPP have over HDLC for serial communications?
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It can communicate more efficiently with other Cisco devices
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It is less complex to configure
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It has less Layer 2 overhead
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It supports authentication
Correct Answer
A. It supports authenticationExplanation
PPP has an advantage over HDLC for serial communications because it supports authentication. This means that PPP can verify the identity of the devices communicating over the serial connection, ensuring that only authorized devices are allowed to access the network. This adds an extra layer of security and helps prevent unauthorized access or data breaches. HDLC, on the other hand, does not have built-in authentication capabilities, making it less secure in comparison.Rate this question:
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- 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.)
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The remote CSU or DSU has failed.
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The router is not sensing a CD signal.
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A timing problem has occurred on the cable.
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The line is not physically connected to the CSU/DSU.
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The router configuration contains the shutdown interface configuration command.
Correct Answer(s)
A. The remote CSU or DSU has failed.
A. A timing problem has occurred on the cable.Explanation
If the interface is in DCE mode, the remote CSU or DSU failing could cause the indicated problem. The CSU (Channel Service Unit) or DSU (Data Service Unit) are responsible for providing clocking and synchronization signals in a serial connection. If either of these fail, it can result in communication issues. Additionally, a timing problem on the cable can also cause problems. Timing problems can occur if the clocking signals are not properly synchronized between the devices connected by the cable.Rate this question:
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- 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?
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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
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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
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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
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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
Correct Answer
A. 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 chapExplanation
The correct answer is the second option:
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
This set of commands configures the DTE router (R3) to communicate over its serial 0/0/0 interface with the DCE router (R1) using PPP encapsulation with CHAP authentication. The hostname of the DTE router is set to R3, and a username/password pair is configured for the DCE router (R1). The serial interface is configured with the appropriate IP address and subnet mask, and PPP encapsulation is enabled. Finally, CHAP authentication is configured for the PPP connection.Rate this question:
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- 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?
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Interface Serial0/0/0 resets very frequently.
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PPP LQM has shutdown the serial interface.
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The serial interface has no input or output queues available
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The serial interface is not configured for a Layer 2 protocol.
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The interface has been administratively shutdown with the shutdown command.
Correct Answer
A. The interface has been administratively shutdown with the shutdown command.Explanation
The reason why Router R1 is not able to communicate with the neighbor router is because the interface connecting them has been administratively shutdown with the shutdown command. This means that the interface is intentionally disabled, preventing any communication through it.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Nov 25, 2010Quiz Created by
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