Test your basic knowledge |

CCNA Hard

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are two characteristics of 'store and forward' switching?
An electrical pulse indicates that the collision has cleared.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
In an improperly implemented redundant topology

2. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
The network layer
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Switches increase the number of collision domains in the network.
An electrical pulse indicates that the collision has cleared.

3. You have set up an Internet based FTP server - where people can upload and download files. In terms of the OSI model - What is the highest layer used during the FTP sessions.
To prevent switching loops in networks with redundant switched paths.
Application
VTP will allow switches to share VLAN configuration information
Increased latency and Filtering of all frame errors

4. What is the IEEE standard associated with Gigabit Ethernet?
VLAN and Swtich
Application
802.3ab and 802.3z
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

5. The CK network administrator needs to determine what LAN devices to install on the CK network. What are two advantages of using Layer 2 Ethernet switches over hubs?
The sequence number in the TCP header.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
It provides a mechanism for the receiver to control the transmission speed - You have just installed a new web server on the Certkiller network. You are required to ensure that the web server is accessible from the Internet. The network uses private
The host network card and the switch port must be capable of operating in full-duplex mode. - There are no collisions in full-duplex mode. and A dedicated switch port is required for each full-duplex node.

6. Which OSI layer header contains the address of a destination host that is on another network?
The network layer
The network layer
Network
MAC Address and Bridge Priority

7. Both bridges are switches are being used throughout the CK LAN. Which of the following statements are true regarding bridges and switches in this network?
Configure the switch so that it has a lower priority than other switches in the network.
Switches usually have a higher number of ports then most bridges - Both bridges and switches forward Layer 2 broadcasts and Both bridges and switches make forwarding decisions based on Layer 2 addresses.
A cross-over cable
A hub and A repeater.

8. Which of the protocols below use TCP at the transport layer?
A device listens and waits until the media is not busy before transmitting. and All devices on an Ethernet segment see data that passes on the network medium.
TCP
VLAN and Swtich
SMTP - FTP - HTTP - and HTTPS

9. when files are transferred between a host and an FTP server - the data is divided into smaller pieces of transmission. As these pieces arrive at the destination host they must be reassembled to reconstruct the original file. What provides for the rea
The switch that will share the VLAN information must be in the VTP Server mode. -The switches must be in the same VTP domain. - The switches must be configured to use the same STP version. and The switches must be connected over VLAN trunks.
The sequence number in the TCP header.
Switches usually have a higher number of ports then most bridges - Both bridges and switches forward Layer 2 broadcasts and Both bridges and switches make forwarding decisions based on Layer 2 addresses.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

10. You need to perform some initial configuration tasks on a new Certkiller switch. What is the purpose of assigning an IP address to a switch?
To allow remote management of the switch.
To obtain the IP address of a connected device in order to telnet to the device - To verify Layer 2 connectivity between two devices when Layer 3 fails.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Packet switching - Packet filtering and Internetwork communication.

11. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
An electrical pulse indicates that the collision has cleared.
The interfaces must be configured for NAT.
Switches increase the number of collision domains in the network.
In a CSMA/CD collision domain - stations must wait until the media is not in use before transmitting. and After a collision - all stations run a random backoff algorithm. When the backoff delay period has expired - all stations have equal priority to

12. A Certkiller technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the sh
To obtain the IP address of a connected device in order to telnet to the device - To verify Layer 2 connectivity between two devices when Layer 3 fails.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Data link
The network layer

13. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 4
Configure the switch so that it has lower priority than other switches in the network
It is the sum of the costs based on bandwidth
Application

14. The LAN needs are expanding at the CK corporate office - which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the CK network. Which of the following are layer 1 devices that you can use?
Application
In an improperly implemented redundant topology
To prevent switching loops in networks with redundant switched paths.
A hub and A repeater.

15. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
Physical Layer and Datalink Layer
Congestion avoidance - Windowing and Buffering
A broadcast address will never be the source address of a frame
A cross-over cable

16. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Encapsulations PPP and authentication CHAP
Decrease the window size.
It provides a mechanism for the receiver to control the transmission speed - You have just installed a new web server on the Certkiller network. You are required to ensure that the web server is accessible from the Internet. The network uses private
Serial0/1 is down - line protocol is down

17. Certkiller users have noticed extremely slow network performance - intermittent connectivity - and connection losses. After entering the 'show interfaces' command - you notice that the Ethernet interface is configured as 100 Mbps full-duplex and that
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
ARP and ICMP
Configure the switch so that it has a lower priority than other switches in the network.
Duplex mismatch

18. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
STP
It encourages industry standardization by defining what functions occur at each layer of the model and It divides the network communication process into smaller and simpler components; thus aiding component development - design and troubleshooting
A jam signal informs all devices that a collision occurred. - The devices that are involved in the collision stops transmitting for a short time. and The collision invokes a random back-off algorithm.
802.1Q and ISL

19. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
An additional broadcast domain will be created.
Auto - Desirable - and On
Switches usually have a higher number of ports then most bridges - Both bridges and switches forward Layer 2 broadcasts and Both bridges and switches make forwarding decisions based on Layer 2 addresses.
Application

20. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Information about a route should never be sent back in the direction from which the original update came.
An additional broadcast domain will be created.
Data link
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

21. Both the switches and hubs are being utilized within the CK network. Which of the following is true regarding the use of switches and hubs for the network connectivity in this network?
Layer 4
TCP
Switches increase the number of collision domains in the network.
A broadcast address will never be the source address of a frame

22. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Switches increase the number of collision domains in the network.
Layer 3
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

23. A host computer has been correctly configured with a static IP address - but the default gateway is incorrectly set. Which layer of the OSI model will be first effected by this configuration error?
Switches increase the number of collision domains in the network.
Network
Layer 3
Sequence number - Window size - and Acknowledgment number

24. Which of the following services use TCP?
SMTP FTP and HTTP
Auto - On - and Desirable
Hosts use a logical bus topology
It is used to prevent switching loops in networks with redundant switched routes.

25. Which of the following can lead to the contribution of LAN traffic congestion?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Packet switching - Packet filtering and Internetwork communication.
Serial0/1 is down - line protocol is down
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

26. The Certkiller network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?
Port security
ARP and ICMP
Information about a route should never be sent back in the direction from which the original update came.
Physical Layer and Datalink Layer

27. While troubleshooting a connectivity problem - the Certkiller network administrator notices that a port status LED on a Cisco Catalyst Series switch is alternating between green and amber. Which condition could this indicate?
The transport layer divides a data stream into segments and adds reliability and flow control information. Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
Auto - Desirable - and On
The port is experiencing errors
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

28. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Serial0/1 is down - line protocol is down
The system is malfunctioning.
Switches increase the number of collision domains in the network.
Data link

29. The corporate head office of Certkiller has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence - wh
Auto - On - and Desirable
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Serial0/1 is down - line protocol is down
ARP and ICMP

30. As the Certkiller network administrator - you are required to have a firmunderstanding of the OSI model. Why does the data communication industry use the layered OSI reference model?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Information about a route should never be sent back in the direction from which the original update came.
A broadcast address will never be the source address of a frame
It encourages industry standardization by defining what functions occur at each layer of the model and It divides the network communication process into smaller and simpler components; thus aiding component development - design and troubleshooting

31. Certkiller is installing IP phones in a new office. The phones and office computers connect to the same device. To ensure maximum throughout for the phone data sessions - the company needs to make sure that the phone traffic is on a different network
A cross-over cable
VTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
VLAN and Swtich

32. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Switches - Bridges - and Routers
Layer 4
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
It is the sum of the costs based on bandwidth

33. Which fields are included in the TCP header?
Source Port - Acknowledgment Number - and Window
It will prevent segment 1's broadcasts from getting to segment 2.
100 meters
MAC Address and Bridge Priority

34. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
Port security
It will prevent segment 1's broadcasts from getting to segment 2.
Sequence number - Window size - and Acknowledgment number
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

35. An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location?
The switch must be reachable through a port connected to its management VLAN. and The switch must be configured with an IP address - subnet mask - and default gateway.
This is an Ethernet port operating at half duplex
It encourages industry standardization by defining what functions occur at each layer of the model and It divides the network communication process into smaller and simpler components; thus aiding component development - design and troubleshooting
Decrease the window size.

36. You want to upgrade the Certkiller LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?
HTTPS - SMTP - and TFTP
Data link
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Network

37. What is the purpose of the spanning-tree algorithm in a switched LAN?
A hub and A repeater.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
To prevent switching loops in networks with redundant switched paths.
Switches increase the number of collision domains in the network.

38. As a Certkiller trainee you are required to set the default gateway on a Cisco switch to the IP address of 192.168.1.115. Which IOS command should you use?
Transport
SMTP FTP and HTTP
Auto - On - and Desirable
CertK Switch(config)# ip default-gateway 192.168.1.115

39. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Path selections and Packet switching.
In an improperly implemented redundant topology
Port security

40. CDP is running between two CK devices. What information is supplied by CDP?
Device Identifiers - Capabilities list - Platform
To prevent switching loops in networks with redundant switched paths.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
An electrical pulse indicates that the collision has cleared.

41. As a CCNA candidate - you will be expected to know the OSI model very well. Which of the following are associated with the application layer (layer 7) of the OSI model?
Encapsulations PPP and authentication CHAP
Path selections and Packet switching.
An electrical pulse indicates that the collision has cleared.
Telnet and FTP

42. You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control that can be used in a network?
The switch will forward the frame to a specific port
Congestion avoidance - Windowing and Buffering
Application
SMTP FTP and HTTP

43. You are the administrator of the Certkiller LAN and you have been reviewing error logs of networking devices and notice a large number of errors associated with several MAC addresses. You suspect that some of the errors are being generated by the rou
Show arp and Show interface
Device Identifiers - Capabilities list - Platform
Configure the switch so that it has lower priority than other switches in the network
Fiber optic cable.

44. A network administrator needs to force a high-performance switch that is located in the MDF to become the root bridge for a redundant path switched network. What can be done to ensure that this switch assumes the role of the Root Bridge?
802.3ab and 802.3z
A cross-over cable
Configure the switch so that it has a lower priority than other switches in the network.
Device Identifiers - Capabilities list - Platform

45. Assuming you build networks to exact specifications - What is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?
HTTPS
The switch must be reachable through a port connected to its management VLAN. and The switch must be configured with an IP address - subnet mask - and default gateway.
An electrical pulse indicates that the collision has cleared.
100 meters

46. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
Show arp and Show interface
Device Identifiers - Capabilities list - Platform
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
TCP

47. With regard to Ethernet media access methods - which of the following are true?
Packet switching - Packet filtering and Internetwork communication.
A device listens and waits until the media is not busy before transmitting. and All devices on an Ethernet segment see data that passes on the network medium.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Congestion avoidance - Windowing and Buffering

48. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Duplex mismatch
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
It operates without collisions and It provides faster data transfer
SMTP FTP and HTTP

49. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
HTTPS
The host network card and the switch port must be capable of operating in full-duplex mode. - There are no collisions in full-duplex mode. and A dedicated switch port is required for each full-duplex node.
The system is malfunctioning.
ARP and ICMP

50. Some of the older Certkiller switches store the entire frame before forwarding it to the destination. What are two effects on network performance of configuring a switch to do this?
Increased latency and Filtering of all frame errors
VTP
To obtain the IP address of a connected device in order to telnet to the device - To verify Layer 2 connectivity between two devices when Layer 3 fails.
Decrease the window size.