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. 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
ARP and ICMP
Show arp and Show interface
HTTPS - SMTP - and TFTP
Layer 3

2. 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
The Bridgeg ID and The bridge priority
Telnet and FTP
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.
Fiber optic cable.

3. Which of the following are spanning tree port states?
The port is experiencing errors
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Learning - Listening - and Forwarding
Sequence number - Window size - and Acknowledgment number

4. 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?
To allow remote management of the switch.
Hosts use a logical bus topology
MAC Address and Bridge Priority
Application

5. As a network Admin - you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of the devices in a WAN?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
This is an Ethernet port operating at half duplex
The network layer
Serial0/1 is down - line protocol is down

6. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
MAC Address and Bridge Priority
An additional broadcast domain will be created.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

7. 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)
The switch will forward the frame to a specific port
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
VTP will allow switches to share VLAN configuration information
Encapsulations PPP and authentication CHAP

8. The Certkiller LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
A broadcast address will never be the source address of a frame
A cross-over cable
Serial0/1 is down - line protocol is down

9. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Packet switching - Packet filtering and Internetwork communication.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
802.1Q and ISL
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

10. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
To prevent switching loops in networks with redundant switched paths.
To allow remote management of the switch.
Switches increase the number of collision domains in the network.

11. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Serial0/1 is down - line protocol is down
To allow remote management of the switch.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Layer 4

12. Which of the following correctly describe the various functions and virtues of a router?
CertK Switch(config)# ip default-gateway 192.168.1.115
SMTP - FTP - HTTP - and HTTPS
100 meters
Packet switching - Packet filtering and Internetwork communication.

13. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
ARP and ICMP
A broadcast address will never be the source address of a frame
Device Identifiers - Capabilities list - Platform
STP

14. 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?
Network
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Show arp and Show interface

15. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Congestion avoidance - Windowing and Buffering
Layer 4
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.
Serial0/1 is down - line protocol is down

16. 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?
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
Transport
Device Identifiers - Capabilities list - Platform
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

17. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
Data link
Auto - On - and Desirable
Data link

18. 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
All switch and bridge ports are in either the forwarding or blocking state.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
The system is malfunctioning.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

19. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
The interfaces must be configured for NAT.
The network layer
MAC Address and Bridge Priority

20. 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?
Physical Layer and Datalink Layer
802.3ab and 802.3z
Packet switching - Packet filtering and Internetwork communication.
This is an Ethernet port operating at half duplex

21. 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?
Sequence number - Window size - and Acknowledgment number
It is the sum of the costs based on bandwidth
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
A hub and A repeater.

22. 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
Path selections and Packet switching.
The network layer
All switch and bridge ports are in either the forwarding or blocking state.
Transport

23. Which of the following are types of flow control?
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.
Telnet and FTP
To prevent switching loops in networks with redundant switched paths.
Buffering - Cut-through - and Congestion avoidance

24. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
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
TCP
Configure the switch so that it has lower priority than other switches in the network
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

25. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Serial0/1 is down - line protocol is down
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.
Configure the switch so that it has a lower priority than other switches in the network.

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?
Show cdp neighbor detail
Hosts use a logical bus topology
ARP and ICMP
Layer 3

27. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Switches - Bridges - and Routers
Decrease the window size.
Show arp and Show interface
Auto - Desirable - and On

28. 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.
Application
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.
Hosts use a logical bus topology
Physical Layer and Datalink Layer

29. 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?
802.3ab and 802.3z
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Layer 3
To allow remote management of the switch.

30. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller 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
Switches - Bridges - and Routers
Increased latency and Filtering of all frame errors
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.

31. 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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
It will prevent segment 1's broadcasts from getting to segment 2.
Certkiller B > trace
Layer 3

32. 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.
802.1Q and ISL
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.

33. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Transport
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
ARP and ICMP
A hub and A repeater.

34. Which of the following services use TCP?
Hosts use a logical bus topology
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
The system is malfunctioning.
SMTP FTP and HTTP

35. 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?
The network layer
100 meters
Telnet and FTP
CertK Switch(config)# ip default-gateway 192.168.1.115

36. Which of the protocols below use TCP at the transport layer?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Application
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.
SMTP - FTP - HTTP - and HTTPS

37. 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?
Layer 3
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
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Device Identifiers - Capabilities list - Platform

38. 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?
All switch and bridge ports are in either the forwarding or blocking state.
It will prevent segment 1's broadcasts from getting to segment 2.
This is an Ethernet port operating at half duplex
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

39. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
MAC Address and Bridge Priority
Certkiller B > trace
A broadcast address will never be the source address of a frame
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.

40. 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.)
HTTPS - SMTP - and TFTP
SMTP - FTP - HTTP - and HTTPS
A cross-over cable
MAC Address and Bridge Priority

41. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Auto - Desirable - and On
STP
The network layer
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.

42. 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?
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 hub and A repeater.
Buffering - Cut-through - and Congestion avoidance
Configure the switch so that it has lower priority than other switches in the network

43. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
Duplex mismatch
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
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.
All switch and bridge ports are in either the forwarding or blocking state.

44. Which protocol uses TCP port 443 at layer 4?
Telnet and FTP
Source Port - Acknowledgment Number - and Window
HTTPS
An additional broadcast domain will be created.

45. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
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.
Congestion avoidance - Windowing and Buffering
VTP will allow switches to share VLAN configuration information
SMTP - FTP - HTTP - and HTTPS

46. 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?
Fiber optic cable.
Sequence number - Window size - and Acknowledgment number
This is an Ethernet port operating at half duplex
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

47. 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.
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
802.1Q and ISL
Auto - On - and Desirable

48. With regard to Ethernet media access methods - which of the following are true?
MAC Address and Bridge Priority
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.
Learning - Listening - and Forwarding
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

49. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Telnet and FTP
Learning - Listening - and Forwarding
MAC Address and Bridge Priority
Data link

50. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Layer 3
Encapsulations PPP and authentication CHAP
In an improperly implemented redundant topology