Showing posts with label CCNA 4 - Chapter 2. Show all posts
Showing posts with label CCNA 4 - Chapter 2. Show all posts
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
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.
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
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
-->Read More...
• 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
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.
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
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
Labels: CCNA 4 - Chapter 2
1. 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?
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.
2. 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.
A timing problem has occurred on the cable.
3. Refer to the exhibit. What statement is true regarding the output shown?
The PAP passwords did not match, so the routers are trying CHAP authentication.
4. Why are serial connections preferred over parallel connections for long transmission lengths?
Parallel connections are subject to clock skew and to crosstalk between wires.
5. Which two statements are true about time-division multiplexing (TDM)? (Choose two.)
Multiple sources can transmit over a single channel.
Original data streams must be reconstructed at the destination.
6. Which authentication protocol can be spoofed to allow playback attacks?
PAP
7. What function do Network Control Protocols provide for a PPP connection?
to allow multiple Layer 3 protocols to operate over the same physical link
8. 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
9. What advantage does PPP have over HDLC for serial communications?
It supports authentication
10. Which PPP configuration option can be used to establish load balancing over the interfaces of a router?
multilink
11. Which three statements are correct about HDLC encapsulation? (Choose three.)
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.
12. 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?
The interface has been administratively shutdown with the shutdown command.
13. Refer to the exhibit. What statement is true regarding the output shown?
Data is able to flow across this link.
14.
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-612/613 (HSSI)
15. What does the demarcation point represent in data communication physical circuits?
physical point at which the public network ends and the private customer network begins
16. 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.
17. 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.
18. Refer to the exhibit. Which statement is true about PPP operation?
Both the link-establishment and network-layer phase completed successfully.
19. Which three statements correctly describe PPP authentication? (Choose three.)
PAP sends passwords in clear text.
CHAP uses a challenge/response that is based on the MD5 hash algorithm.
CHAP uses repeated challenges for verification.
20. Which two options can LCP negotiate? (Choose two.)
link quality
authentication
21. Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established?
two
-->Read More...
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.
2. 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.
A timing problem has occurred on the cable.
3. Refer to the exhibit. What statement is true regarding the output shown?
The PAP passwords did not match, so the routers are trying CHAP authentication.
4. Why are serial connections preferred over parallel connections for long transmission lengths?
Parallel connections are subject to clock skew and to crosstalk between wires.
5. Which two statements are true about time-division multiplexing (TDM)? (Choose two.)
Multiple sources can transmit over a single channel.
Original data streams must be reconstructed at the destination.
6. Which authentication protocol can be spoofed to allow playback attacks?
PAP
7. What function do Network Control Protocols provide for a PPP connection?
to allow multiple Layer 3 protocols to operate over the same physical link
8. 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
9. What advantage does PPP have over HDLC for serial communications?
It supports authentication
10. Which PPP configuration option can be used to establish load balancing over the interfaces of a router?
multilink
11. Which three statements are correct about HDLC encapsulation? (Choose three.)
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.
12. 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?
The interface has been administratively shutdown with the shutdown command.
13. Refer to the exhibit. What statement is true regarding the output shown?
Data is able to flow across this link.
14.
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-612/613 (HSSI)
15. What does the demarcation point represent in data communication physical circuits?
physical point at which the public network ends and the private customer network begins
16. 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.
17. 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.
18. Refer to the exhibit. Which statement is true about PPP operation?
Both the link-establishment and network-layer phase completed successfully.
19. Which three statements correctly describe PPP authentication? (Choose three.)
PAP sends passwords in clear text.
CHAP uses a challenge/response that is based on the MD5 hash algorithm.
CHAP uses repeated challenges for verification.
20. Which two options can LCP negotiate? (Choose two.)
link quality
authentication
21. Refer to the exhibit. On the basis of the show interface Serial0/0 output, how many NCP sessions have been established?
two
Labels: CCNA 4 - Chapter 2
;;
Subscribe to:
Posts (Atom)
