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. 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?
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.
Switches increase the number of collision domains in the network.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

2. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Switches increase the number of collision domains in the network.
Path selections and Packet switching.
Layer 3
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

3. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Layer 4
An additional broadcast domain will be created.
Application
MAC Address and Bridge Priority

4. With regard to Ethernet media access methods - which of the following are true?
The system is malfunctioning.
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.
MAC Address and Bridge Priority
Layer 4

5. Which OSI layer header contains the address of a destination host that is on another network?
Port security
All switch and bridge ports are in either the forwarding or blocking state.
Network
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

6. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
Transport
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Data link

7. Which of the following correctly describe the various functions and virtues of a router?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Source Port - Acknowledgment Number - and Window
Application
Packet switching - Packet filtering and Internetwork communication.

8. 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?
Show cdp neighbor detail
It operates without collisions and It provides faster data transfer
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The network layer

9. In a switched LAN network - What is the Spanning-Tree algorithm used for?
The network layer
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Port security
It is used to prevent switching loops in networks with redundant switched routes.

10. Which of the following correctly describe steps in the OSI date encapsulation process?
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.
Learning - Listening - and Forwarding
The Bridgeg ID and The bridge priority
Port security

11. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
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.
Transport
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VLAN and Swtich

12. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
An electrical pulse indicates that the collision has cleared.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Learning - Listening - and Forwarding

13. 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?
The network layer
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
Sequence number - Window size - and Acknowledgment number

14. 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?
An additional broadcast domain will be created.
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
Show cdp neighbor detail
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

15. 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
Telnet and FTP
This is an Ethernet port operating at half duplex
Learning - Listening - and Forwarding

16. CDP is running between two CK devices. What information is supplied by CDP?
Device Identifiers - Capabilities list - Platform
To allow remote management of the switch.
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.
Auto - On - and Desirable

17. A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?
Port security
Decrease the window size.
The interfaces must be configured for NAT.
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

18. 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?
Congestion avoidance - Windowing and Buffering
Layer 4
Increased latency and Filtering of all frame errors
It operates without collisions and It provides faster data transfer

19. 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)
Application
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
802.1Q and ISL
Buffering - Cut-through - and Congestion avoidance

20. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Port security
Switches increase the number of collision domains in the network.
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.
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.

21. 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.
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.
Telnet and FTP
Fiber optic cable.

22. 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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Congestion avoidance - Windowing and Buffering
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
Show cdp neighbor detail

23. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
It is the sum of the costs based on bandwidth
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.
Data link
Device Identifiers - Capabilities list - Platform

24. What are two characteristics of 'store and forward' switching?
Congestion avoidance - Windowing and Buffering
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
SMTP FTP and HTTP
A broadcast address will never be the source address of a frame

25. Which of the following services use TCP?
SMTP FTP and HTTP
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
TCP
HTTPS - SMTP - and TFTP

26. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Configure the switch so that it has lower priority than other switches in the network
STP
Configure the switch so that it has a lower priority than other switches in the network.
Auto - On - and Desirable

27. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Network
Congestion avoidance - Windowing and Buffering
All switch and bridge ports are in either the forwarding or blocking state.
Switches - Bridges - and Routers

28. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Device Identifiers - Capabilities list - Platform
Network
TCP
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.

29. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
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 network layer
Switches - Bridges - and Routers
Auto - Desirable - and On

30. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
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
Auto - On - and Desirable
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

31. 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
Layer 4
TCP
Certkiller B > trace

32. Which fields are included in the TCP header?
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.
Source Port - Acknowledgment Number - and Window
Fiber optic cable.
SMTP FTP and HTTP

33. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
MAC Address and Bridge Priority
Transport
In an improperly implemented redundant topology
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

34. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
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
It will prevent segment 1's broadcasts from getting to segment 2.
100 meters

35. By default - which of the following factors determines the spanning-tree path cost?
Switches increase the number of collision domains in the network.
It is the sum of the costs based on bandwidth
Data link
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

36. 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
Layer 4
It is the sum of the costs based on bandwidth
100 meters

37. 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
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.
Serial0/1 is down - line protocol is down
Data link
802.1Q and ISL

38. 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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
100 meters
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
Certkiller B > trace

39. 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?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
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
Configure the switch so that it has a lower priority than other switches in the network.

40. 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?
Application
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 interfaces must be configured for NAT.
TCP

41. 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
Show cdp neighbor detail
Duplex mismatch
Transport
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. You are logged into a router and wish to view the layer 3 information about your neighboring Cisco routers. What IOS command gives layer 3 information for of the directly connected router interfaces?
Show cdp neighbor detail
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 system is malfunctioning.
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

43. Which of the following can lead to the contribution of LAN traffic congestion?
Encapsulations PPP and authentication CHAP
The network layer
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Application

44. A Certkiller Ethernet switch receives a unicast frame with a destination MAC that IS listed in the switch table. What will this switch do with the frame?
An electrical pulse indicates that the collision has cleared.
The switch will forward the frame to a specific port
The sequence number in the TCP header.
Fiber optic cable.

45. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Network
It will prevent segment 1's broadcasts from getting to segment 2.

46. 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?
Serial0/1 is down - line protocol is down
A cross-over cable
Source Port - Acknowledgment Number - and Window
An electrical pulse indicates that the collision has cleared.

47. 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?
TCP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
It will prevent segment 1's broadcasts from getting to segment 2.
CertK Switch(config)# ip default-gateway 192.168.1.115

48. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Information about a route should never be sent back in the direction from which the original update came.
Transport
Serial0/1 is down - line protocol is down
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.

49. 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
Fiber optic cable.
Transport
SMTP - FTP - HTTP - and HTTPS
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

50. 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.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
An electrical pulse indicates that the collision has cleared.
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.