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CCNA Hard

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
The system is malfunctioning.
To prevent switching loops in networks with redundant switched paths.
Port security
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

2. 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?
Configure the switch so that it has lower priority than other switches in the network
CertK Switch(config)# ip default-gateway 192.168.1.115
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 port is experiencing errors

3. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Path selections and Packet switching.
STP
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
An electrical pulse indicates that the collision has cleared.

4. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Layer 4
802.3ab and 802.3z
Increased latency and Filtering of all frame errors
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

5. Which of the following services use TCP?
802.3ab and 802.3z
SMTP FTP and HTTP
802.1Q and ISL
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

6. 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?
Switches increase the number of collision domains in the network.
Congestion avoidance - Windowing and Buffering
Duplex mismatch
To allow remote management of the switch.

7. 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
Sequence number - Window size - and Acknowledgment number
A hub and A repeater.
The network layer

8. 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
A cross-over cable
Data link
Hosts use a logical bus topology
The network layer

9. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
MAC Address and Bridge Priority
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
VTP will allow switches to share VLAN configuration information
It is the sum of the costs based on bandwidth

10. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
To prevent switching loops in networks with redundant switched paths.
In an improperly implemented redundant topology
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Auto - Desirable - and On

11. 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?
Device Identifiers - Capabilities list - Platform
Configure the switch so that it has a lower priority than other switches in the 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
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.

12. 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?
It is the sum of the costs based on bandwidth
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.
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. 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?
Duplex mismatch
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Switches increase the number of collision domains in the network.
An electrical pulse indicates that the collision has cleared.

14. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Duplex mismatch
Decrease the window size.
Transport
Serial0/1 is down - line protocol is down

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?
It operates without collisions and It provides faster data transfer
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.
Telnet and FTP
Data link

16. 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
All switch and bridge ports are in either the forwarding or blocking state.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

17. With regard to Ethernet media access methods - which of the following are true?
Switches - Bridges - and Routers
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.
Application
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

18. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Sequence number - Window size - and Acknowledgment number
Auto - Desirable - and On
An electrical pulse indicates that the collision has cleared.
STP

19. 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?
802.1Q and ISL
Path selections and Packet switching.
Data link
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

20. 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
The switch will forward the frame to a specific port
MAC Address and Bridge Priority

21. 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?
Network
An electrical pulse indicates that the collision has cleared.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

22. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
STP
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.

23. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
To allow remote management of the switch.
The system is malfunctioning.
A hub and A repeater.
All switch and bridge ports are in either the forwarding or blocking state.

24. Which of the following can lead to the contribution of LAN traffic congestion?
Congestion avoidance - Windowing and Buffering
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Layer 3
Buffering - Cut-through - and Congestion avoidance

25. Which OSI layer header contains the address of a destination host that is on another 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
Increased latency and Filtering of all frame errors
Network
802.3ab and 802.3z

26. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
100 meters
This is an Ethernet port operating at half duplex
Switches - Bridges - and Routers
Data link

27. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
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.
Switches increase the number of collision domains in the network.
STP
Network

28. Which of the following correctly describe steps in the OSI date encapsulation process?
Network
To prevent switching loops in networks with redundant switched paths.
The switch will forward the frame to a specific port
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.

29. 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
VTP
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Buffering - Cut-through - and Congestion avoidance

30. 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?
Path selections and Packet switching.
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
Device Identifiers - Capabilities list - Platform
Source Port - Acknowledgment Number - and Window

31. Which three of the protocols below belong to the application layer? (Select three answer choices)
To prevent switching loops in networks with redundant switched paths.
It is used to prevent switching loops in networks with redundant switched routes.
HTTPS - SMTP - and TFTP
Layer 4

32. 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
Physical Layer and Datalink Layer
It is the sum of the costs based on bandwidth
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.
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. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Sequence number - Window size - and Acknowledgment number
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.
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.
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.

34. 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?
Decrease the window size.
The network layer
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.
VTP will allow switches to share VLAN configuration information

35. 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?
The system is malfunctioning.
Device Identifiers - Capabilities list - Platform
Increased latency and Filtering of all frame errors
TCP

36. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Layer 4
To prevent switching loops in networks with redundant switched paths.
Serial0/1 is down - line protocol is down
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.

37. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
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
CertK Switch(config)# ip default-gateway 192.168.1.115
The system is malfunctioning.
Layer 4

38. Which of the protocols below use TCP at the transport layer?
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.
This is an Ethernet port operating at half duplex
SMTP - FTP - HTTP - and HTTPS
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

39. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
Auto - Desirable - and On
Decrease the window size.
It operates without collisions and It provides faster data transfer

40. In a switched LAN network - What is the Spanning-Tree algorithm used for?
It is used to prevent switching loops in networks with redundant switched routes.
Show arp and Show interface
Configure the switch so that it has a lower priority than other switches in the 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

41. 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.
VLAN and Swtich
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

42. 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
802.3ab and 802.3z
Sequence number - Window size - and Acknowledgment number
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.

43. 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?
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.
802.1Q and ISL
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.

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?
802.3ab and 802.3z
The switch will forward the frame to a specific port
The network layer
The system is malfunctioning.

45. You need to configure two Certkiller switches to exchange VLAN information. Which protocol provides a method of sharing VLAN configuration information between these two switches?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
It is the sum of the costs based on bandwidth
A broadcast address will never be the source address of a frame
VTP

46. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
Configure the switch so that it has a lower priority than other switches in the network.
In an improperly implemented redundant topology
All switch and bridge ports are in either the forwarding or blocking state.
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.

47. 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 system is malfunctioning.
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.
The network layer
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.

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

49. 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.
802.1Q and ISL
Application
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Show cdp neighbor detail

50. 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
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.
Fiber optic cable.
Source Port - Acknowledgment Number - and Window
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

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