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. 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?
Buffering - Cut-through - and Congestion avoidance
Device Identifiers - Capabilities list - Platform
Increased latency and Filtering of all frame errors
Hosts use a logical bus topology

2. 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?
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
Application
Port security

3. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
A broadcast address will never be the source address of a frame
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
802.1Q and ISL

4. 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
The Bridgeg ID and The bridge priority
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

5. Which protocol uses TCP port 443 at layer 4?
HTTPS
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
Transport

6. Which fields are included in the TCP header?
VLAN and Swtich
Source Port - Acknowledgment Number - and Window
The port is experiencing errors
An additional broadcast domain will be created.

7. 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 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.
All switch and bridge ports are in either the forwarding or blocking state.
Port security
VLAN and Swtich

8. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
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.
Fiber optic cable.
To allow remote management of the switch.
Device Identifiers - Capabilities list - Platform

9. 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?
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.
The port is experiencing errors
A cross-over cable
The network layer

10. 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.
The port is experiencing errors
Application
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?
Physical Layer and Datalink Layer
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.
In an improperly implemented redundant topology
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.

12. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Device Identifiers - Capabilities list - Platform
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
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.

13. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
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.
HTTPS - SMTP - and TFTP
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 switch will forward the frame to a specific port

14. 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?
SMTP - FTP - HTTP - and HTTPS
Serial0/1 is down - line protocol is down
Congestion avoidance - Windowing and Buffering
Application

15. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Configure the switch so that it has lower priority than other switches in the network
To prevent switching loops in networks with redundant switched paths.
Data link
MAC Address and Bridge Priority

16. Which of the following can lead to the contribution of LAN traffic congestion?
Data link
Duplex mismatch
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.

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
Configure the switch so that it has lower priority than other switches in the network
Auto - Desirable - and On
The Bridgeg ID and The bridge priority
Duplex mismatch

18. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
SMTP - FTP - HTTP - and HTTPS
Transport
The port is experiencing errors
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

19. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
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.
Sequence number - Window size - and Acknowledgment number
802.3ab and 802.3z
HTTPS

20. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
STP
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Path selections and Packet switching.
100 meters

21. What is the purpose of the spanning-tree algorithm in a switched LAN?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Packet switching - Packet filtering and Internetwork communication.
MAC Address and Bridge Priority
To prevent switching loops in networks with redundant switched paths.

22. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
VTP will allow switches to share VLAN configuration information
Certkiller B > trace
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

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
Buffering - Cut-through - and Congestion avoidance
Telnet and FTP
It will prevent segment 1's broadcasts from getting to segment 2.

24. Which of the following services use TCP?
SMTP FTP and HTTP
A hub and A repeater.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
To allow remote management of the switch.

25. 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.
It operates without collisions and It provides faster data transfer
Sequence number - Window size - and Acknowledgment number
Source Port - Acknowledgment Number - and Window

26. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Layer 3
Source Port - Acknowledgment Number - and Window
TCP
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.

27. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Configure the switch so that it has a lower priority than other switches in the network.
An additional broadcast domain will be created.
802.1Q and ISL
Show arp and Show interface

28. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Decrease the window size.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Path selections and Packet switching.

29. 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
STP
SMTP - FTP - HTTP - and HTTPS
It is the sum of the costs based on bandwidth

30. 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?
Network
Packet switching - Packet filtering and Internetwork communication.
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.

31. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
CertK Switch(config)# ip default-gateway 192.168.1.115
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.
Layer 3

32. Why is full-duplex Ethernet superior to its single-duplex counterpart?
CertK Switch(config)# ip default-gateway 192.168.1.115
It operates without collisions and It provides faster data transfer
Show cdp neighbor detail
An additional broadcast domain will be created.

33. 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.
Learning - Listening - and Forwarding
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
MAC Address and Bridge Priority

34. Which of the protocols below use TCP at the transport layer?
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.
802.3ab and 802.3z
SMTP - FTP - HTTP - and HTTPS
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

35. 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 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.
MAC Address and Bridge Priority
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.

36. 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?
VTP
To prevent switching loops in networks with redundant switched paths.
Buffering - Cut-through - and Congestion avoidance
100 meters

37. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
VTP will allow switches to share VLAN configuration information
Layer 4
Encapsulations PPP and authentication CHAP
It is the sum of the costs based on bandwidth

38. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Certkiller B > trace
To prevent switching loops in networks with redundant switched paths.

39. 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
Telnet and FTP
Data link
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Source Port - Acknowledgment Number - and Window

40. 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?
Information about a route should never be sent back in the direction from which the original update came.
Network
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Switches increase the number of collision domains in the network.

41. 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?
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 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.
Application
802.1Q and ISL

42. Which of the following are types of flow control?
MAC Address and Bridge Priority
Buffering - Cut-through - and Congestion avoidance
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.
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.

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
Configure the switch so that it has lower priority than other switches in the network
Buffering - Cut-through - and Congestion avoidance
Show arp and Show interface
Data link

44. Which three of the protocols below belong to the application layer? (Select three answer choices)
Fiber optic cable.
MAC Address and Bridge Priority
HTTPS - SMTP - and TFTP
Show arp and Show interface

45. 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 will forward the frame to a specific port
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.
VTP will allow switches to share VLAN configuration information
Path selections and Packet switching.

46. 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
Configure the switch so that it has a lower priority than other switches in the network.
Application
Show cdp neighbor detail

47. 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?
Application
Source Port - Acknowledgment Number - and Window
Physical Layer and Datalink Layer
A broadcast address will never be the source address of a frame

48. With regard to Ethernet media access methods - which of the following are true?
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.
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.

49. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
VLAN and Swtich
Network

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
Source Port - Acknowledgment Number - and Window
HTTPS - SMTP - and TFTP
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