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. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
VTP will allow switches to share VLAN configuration information
It is the sum of the costs based on bandwidth
A broadcast address will never be the source address of a frame
Application

2. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
The system is malfunctioning.
Hosts use a logical bus topology
A hub and A repeater.

3. 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.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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 arp and Show interface

4. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Serial0/1 is down - line protocol is down
The network layer
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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.

5. 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
The switch will forward the frame to a specific port
Layer 4
Packet switching - Packet filtering and Internetwork communication.

6. 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 receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Show arp and Show interface

7. 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?
Layer 4
Decrease the window size.
Device Identifiers - Capabilities list - Platform
Application

8. 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?
SMTP FTP and HTTP
Port security
This is an Ethernet port operating at half duplex
802.1Q and ISL

9. Which fields are included in the TCP header?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Source Port - Acknowledgment Number - and Window
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.

10. 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?
HTTPS
Increased latency and Filtering of all frame 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
Configure the switch so that it has lower priority than other switches in the network

11. 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.
Data link
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.

12. As a CCNA candidate - you must know the various layers of the OSI model. At which layers of the OSI model do Wide Area Networks operate in?
The system is malfunctioning.
Physical Layer and Datalink Layer
It is used to prevent switching loops in networks with redundant switched routes.
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.

13. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Certkiller B > trace
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Configure the switch so that it has lower priority than other switches in the network
It will prevent segment 1's broadcasts from getting to segment 2.

14. 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
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
To prevent switching loops in networks with redundant switched paths.
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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

15. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
The interfaces must be configured for NAT.
TCP
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.
Show arp and Show interface

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?
Application
HTTPS
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
HTTPS - SMTP - and TFTP

17. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Source Port - Acknowledgment Number - and Window
A cross-over cable
Auto - Desirable - and On
Switches increase the number of collision domains in the network.

18. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The system is malfunctioning.
The port is experiencing errors
Switches increase the number of collision domains in the network.

19. 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?
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.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Path selections and Packet switching.
The interfaces must be configured for NAT.

20. 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?
Switches increase the number of collision domains in the network.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
SMTP - FTP - HTTP - and HTTPS
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

21. What is the purpose of the spanning-tree algorithm in a switched LAN?
Telnet and FTP
To prevent switching loops in networks with redundant switched paths.
In an improperly implemented redundant topology
Serial0/1 is down - line protocol is down

22. Which OSI layer header contains the address of a destination host that is on another network?
A cross-over cable
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
It is used to prevent switching loops in networks with redundant switched routes.
Network

23. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Auto - On - and Desirable
Layer 4
Configure the switch so that it has lower priority than other switches in the network
All switch and bridge ports are in either the forwarding or blocking state.

24. Why is full-duplex Ethernet superior to its single-duplex counterpart?
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
Increased latency and Filtering of all frame errors
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.
It operates without collisions and It provides faster data transfer

25. 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?
802.1Q and ISL
Information about a route should never be sent back in the direction from which the original update came.
Transport
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.

26. 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?
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
It will prevent segment 1's broadcasts from getting to segment 2.
Sequence number - Window size - and Acknowledgment number

27. 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
Duplex mismatch
STP
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
The switch will forward the frame to a specific port

28. 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
It is the sum of the costs based on bandwidth
The interfaces must be configured for NAT.
The network layer
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

29. 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?
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.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
It is used to prevent switching loops in networks with redundant switched routes.

30. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 3
Layer 4
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
802.3ab and 802.3z

31. 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.
Network
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.
A cross-over cable

32. 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?
A hub and A repeater.
Fiber optic cable.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
ARP and ICMP

33. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Switches increase the number of collision domains in the network.
STP
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Configure the switch so that it has a lower priority than other switches in the network.

34. 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?
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
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Physical Layer and Datalink Layer
It will prevent segment 1's broadcasts from getting to segment 2.

35. While troubleshooting a connectivity problem on the network - you issure the ping command from your PC command prompt - but the output shows 'request times out' At which OSI layer is this problem associated with?
The network layer
To prevent switching loops in networks with redundant switched paths.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Path selections and Packet switching.

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
100 meters
Sequence number - Window size - and Acknowledgment number
Network

37. 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?
It is the sum of the costs based on bandwidth
Application
It will prevent segment 1's broadcasts from getting to segment 2.
Layer 3

38. In a switched LAN network - What is the Spanning-Tree algorithm used for?
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
Layer 4
Encapsulations PPP and authentication CHAP
It is used to prevent switching loops in networks with redundant switched routes.

39. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
In an improperly implemented redundant topology
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Data link
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

40. The Certkiller corporate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change?

41. 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?
HTTPS - SMTP - and TFTP
CertK Switch(config)# ip default-gateway 192.168.1.115
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
VTP will allow switches to share VLAN configuration information

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?
HTTPS - SMTP - and TFTP
Show cdp neighbor detail
The interfaces must be configured for NAT.
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.

43. 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
It is the sum of the costs based on bandwidth
The network layer
Network
Fiber optic cable.

44. 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?
A broadcast address will never be the source address of a frame
This is an Ethernet port operating at half duplex
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Path selections and Packet switching.

45. Which protocol uses TCP port 443 at layer 4?
It is the sum of the costs based on bandwidth
Increased latency and Filtering of all frame errors
HTTPS
802.1Q and ISL

46. 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
It is used to prevent switching loops in networks with redundant switched routes.
Layer 3
Source Port - Acknowledgment Number - and Window

47. Which two of the following values does STP take into consideration when it elects the root bridge?
SMTP FTP and HTTP
Sequence number - Window size - and Acknowledgment number
Data link
The Bridgeg ID and The bridge priority

48. 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?
An electrical pulse indicates that the collision has cleared.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Information about a route should never be sent back in the direction from which the original update came.
Path selections and Packet switching.

49. 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.
Network
A hub and A repeater.
VTP

50. 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
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.
802.3ab and 802.3z
ARP and ICMP
SMTP - FTP - HTTP - and HTTPS