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. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Information about a route should never be sent back in the direction from which the original update came.
Layer 3
Data link
Hosts use a logical bus topology

2. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
A cross-over cable
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.
The port is experiencing errors

3. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Auto - Desirable - and On
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

4. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Application
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Switches increase the number of collision domains in the network.

5. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
Auto - On - and Desirable
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
Buffering - Cut-through - and Congestion avoidance

6. While troubleshooting a network connectivity problem - a Certkiller technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However - when the ping command is issued from the works
The network layer
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Hosts use a logical bus topology
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.

7. You unsuccessfully try to ping the Internet from the PC host on the LAN. During the troubleshooting process - you enter the 'show ip nat translations' command but the output is blank. What is the most likely cause of the problem?
Certkiller B > trace
The interfaces must be configured for NAT.
HTTPS - SMTP - and TFTP
Layer 3

8. You want to influence the root bridge selection within the Certkiller LAN. Which two values are used by spanning tree protocol to elect a root bridge? (Choose two.)
Physical Layer and Datalink Layer
Path selections and Packet switching.
It operates without collisions and It provides faster data transfer
MAC Address and Bridge Priority

9. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
Application
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
A broadcast address will never be the source address of a frame
TCP

10. What are two characteristics of 'store and forward' switching?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Congestion avoidance - Windowing and Buffering
CertK Switch(config)# ip default-gateway 192.168.1.115
Buffering - Cut-through - and Congestion avoidance

11. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
SMTP - FTP - HTTP - and HTTPS
Congestion avoidance - Windowing and Buffering
In an improperly implemented redundant topology
802.3ab and 802.3z

12. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Sequence number - Window size - and Acknowledgment number
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

13. Which of the protocols below use TCP at the transport layer?
An additional broadcast domain will be created.
Certkiller B > trace
Buffering - Cut-through - and Congestion avoidance
SMTP - FTP - HTTP - and HTTPS

14. 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 sequence number in the TCP header.
Transport
MAC Address and Bridge Priority
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.

15. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
The switch will forward the frame to a specific port
Application
To allow remote management of the switch.

16. 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?
It is used to prevent switching loops in networks with redundant switched routes.
It operates without collisions and It provides faster data transfer
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.
Transport

17. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Auto - On - and Desirable
Duplex mismatch
STP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

18. Which fields are included in the TCP header?
Source Port - Acknowledgment Number - and Window
Device Identifiers - Capabilities list - Platform
It is used to prevent switching loops in networks with redundant switched routes.
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.

19. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Source Port - Acknowledgment Number - and Window
Device Identifiers - Capabilities list - Platform
Encapsulations PPP and authentication CHAP

20. On a half-duplex Ethernet LAN - two hosts attempt to send data simultaneously - resulting in a collision. Following this collision - what will the hosts do?
Increased latency and Filtering of all frame errors
The interfaces must be configured for NAT.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
An electrical pulse indicates that the collision has cleared.

21. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Duplex mismatch
Layer 4
VLAN and Swtich
A broadcast address will never be the source address of a frame

22. You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operations?
Physical Layer and Datalink Layer
The network layer
Switches increase the number of collision domains in the network.
Application

23. 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?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
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 broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

24. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Decrease the window size.
Certkiller B > trace
The port is experiencing errors
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

25. While troubleshooting an issue in the Certkiller LAN you notice that a network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement - What is known about the network interface port?
This is an Ethernet port operating at half duplex
802.3ab and 802.3z
802.1Q and ISL
The network layer

26. A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
Decrease the window size.
Application
To prevent switching loops in networks with redundant switched paths.
VTP will allow switches to share VLAN configuration information

27. 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?
Congestion avoidance - Windowing and Buffering
Telnet and FTP
The network layer
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

28. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
TCP
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.
Show arp and Show interface
A hub and A repeater.

29. 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?
SMTP - FTP - HTTP - and HTTPS
Hosts use a logical bus topology
Switches increase the number of collision domains in the network.
Network

30. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
An electrical pulse indicates that the collision has cleared.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Sequence number - Window size - and Acknowledgment number
Auto - Desirable - and On

31. 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 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.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VTP will allow switches to share VLAN configuration information
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

32. Which two of the following values does STP take into consideration when it elects the root bridge?
Show cdp neighbor detail
A cross-over cable
The Bridgeg ID and The bridge priority
SMTP FTP and HTTP

33. Although TCP segments are similar to UDP segments - TCP packets contains some additional fields. Which of the following are found in a TCP header - but not in a UDP header?
Telnet and FTP
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 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.
Sequence number - Window size - and Acknowledgment number

34. A new switch is installed in the Certkiller network. This switch is to be configured so that VLAN information will be automatically distributed to all the other Cisco Catalyst switches in the network. Which of the conditions below have to be met in o
802.1Q and ISL
Serial0/1 is down - line protocol is down
This is an Ethernet port operating at half duplex
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.

35. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Packet switching - Packet filtering and Internetwork communication.
CertK Switch(config)# ip default-gateway 192.168.1.115
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Auto - On - and Desirable

36. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
To prevent switching loops in networks with redundant switched paths.
It operates without collisions and It provides faster data transfer
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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.

37. Which of the following are true of Ethernet technology?
Application
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Hosts use a logical bus topology
MAC Address and Bridge Priority

38. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Device Identifiers - Capabilities list - Platform
Serial0/1 is down - line protocol is down
The interfaces must be configured for NAT.
To prevent switching loops in networks with redundant switched paths.

39. What is the IEEE standard associated with Gigabit Ethernet?
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.
Certkiller B > trace
Port security
802.3ab and 802.3z

40. The Certkiller network administrator needs to a switch named CK1 to become the root bridge for a redundant path switched network. What can be done to ensure that CK1 will always assume the role as the root bridge?
Configure the switch so that it has lower priority than other switches in the network
100 meters
Decrease the window size.
SMTP - FTP - HTTP - and HTTPS

41. 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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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.
Packet switching - Packet filtering and Internetwork communication.
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.

42. Network equipment supporting the use of flow control mechanisms has been recently installed in the CK network. What is the purpose of flow control in a data network?
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.
VTP will allow switches to share VLAN configuration information
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
SMTP - FTP - HTTP - and HTTPS

43. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
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.
An additional broadcast domain will be created.
Information about a route should never be sent back in the direction from which the original update came.
The network layer

44. Which OSI layer header contains the address of a destination host that is on another network?
The network layer
Telnet and FTP
Auto - Desirable - and On
Network

45. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Show cdp neighbor detail
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
The system is malfunctioning.

46. The Certkiller network administrator wants to use a router named CK1 to segment the local network. What are some of the advantages of using CK1 to segment the network? (Choose two)
An electrical pulse indicates that the collision has cleared.
VTP
Data link
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

47. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
An electrical pulse indicates that the collision has cleared.
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.
Source Port - Acknowledgment Number - and Window
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

48. Two buildings on the London campus of a CK corporation must be connected to use Ethernet with a bandwidth of at least 100 Mbps. CK is concerned about possible problems from voltage potential differences between the two buldings. Which media type shou
Telnet and FTP
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.
Fiber optic cable.
A broadcast address will never be the source address of a frame

49. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Network
Layer 4
Application
Fiber optic cable.

50. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Sequence number - Window size - and Acknowledgment number
Telnet and FTP
It will prevent segment 1's broadcasts from getting to segment 2.