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CCNA Hard

Instructions:

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. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
A hub and A repeater.
Serial0/1 is down - line protocol is down
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4

2. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Buffering - Cut-through - and Congestion avoidance
TCP
VTP will allow switches to share VLAN configuration information

3. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Sequence number - Window size - and Acknowledgment number
The network layer
Encapsulations PPP and authentication CHAP
It operates without collisions and It provides faster data transfer

4. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
CertK Switch(config)# ip default-gateway 192.168.1.115
Path selections and Packet switching.
Data link
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.

5. 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
Data link
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Buffering - Cut-through - and Congestion avoidance

6. 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
To prevent switching loops in networks with redundant switched paths.
Too many hosts in a broadcast domain - Broadcast storms and Low 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.
Data link

7. 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 cross-over cable
The interfaces must be configured for NAT.
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.

8. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Network
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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

9. By default - which of the following factors determines the spanning-tree path cost?
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.
Switches increase the number of collision domains in the network.
It is the sum of the costs based on bandwidth
Show arp and Show interface

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?
Increased latency and Filtering of all frame errors
The network layer
It will prevent segment 1's broadcasts from getting to segment 2.
Switches increase the number of collision domains in the network.

11. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
All switch and bridge ports are in either the forwarding or blocking state.
An additional broadcast domain will be created.
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.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

12. Which protocol uses TCP port 443 at layer 4?
HTTPS
TCP
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Auto - On - and Desirable

13. Which of the following are true of Ethernet technology?
The network layer
Layer 4
Hosts use a logical bus topology
A hub and A repeater.

14. 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?
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
Application
It operates without collisions and It provides faster data transfer

15. 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?
CertK Switch(config)# ip default-gateway 192.168.1.115
HTTPS
Network
The sequence number in the TCP header.

16. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Switches increase the number of collision domains in the network.
Encapsulations PPP and authentication CHAP
Show cdp neighbor detail
Configure the switch so that it has a lower priority than other switches in the network.

17. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Information about a route should never be sent back in the direction from which the original update came.
Layer 4
An additional broadcast domain will be created.
STP

18. Which two of the following values does STP take into consideration when it elects the root bridge?
Switches increase the number of collision domains in the network.
The Bridgeg ID and The bridge priority
Layer 4
An electrical pulse indicates that the collision has cleared.

19. What is the IEEE standard associated with Gigabit Ethernet?
802.3ab and 802.3z
Sequence number - Window size - and Acknowledgment number
Source Port - Acknowledgment Number - and Window
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

20. 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?
To prevent switching loops in networks with redundant switched paths.
Information about a route should never be sent back in the direction from which the original update came.
Certkiller B > trace
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

21. 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
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.
VTP
Data link
Application

22. Which fields are included in the TCP header?
Source Port - Acknowledgment Number - and Window
Layer 3
Switches - Bridges - and Routers
STP

23. 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.
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 broadcast address will never be the source address of a frame
Data link

24. Which of the following correctly describe steps in the OSI date encapsulation process?
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.
Certkiller B > trace
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.
Congestion avoidance - Windowing and Buffering

25. 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?
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.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

26. 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?
HTTPS
It is the sum of the costs based on bandwidth
Configure the switch so that it has a lower priority than other switches in the network.
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.

27. 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?
Telnet and FTP
Network
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Fiber optic cable.

28. Which of the following are spanning tree port states?
Switches increase the number of collision domains in 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.
Learning - Listening - and Forwarding
Duplex mismatch

29. Which of the following can lead to the contribution of LAN traffic congestion?
802.3ab and 802.3z
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Duplex mismatch
TCP

30. 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?
The interfaces must be configured for NAT.
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.
ARP and ICMP

31. 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.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Hosts use a logical bus topology
CertK Switch(config)# ip default-gateway 192.168.1.115

32. Which IOS user EXEC command will allow a network technician to determine which router in the path to an unreachable network host should be examined more closely for the cause of the network failure?
Certkiller B > trace
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Transport
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

33. Which three of the protocols below belong to the application layer? (Select three answer choices)
Switches increase the number of collision domains in the network.
Sequence number - Window size - and Acknowledgment number
HTTPS - SMTP - and TFTP
An additional broadcast domain will be created.

34. 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.
A hub and A repeater.
Application
Transport
MAC Address and Bridge Priority

35. 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?
The system is malfunctioning.
Sequence number - Window size - and Acknowledgment number
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.
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.

36. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
The Bridgeg ID and The bridge priority
Telnet and FTP
ARP and ICMP
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

37. The Certkiller network administrator needs to a switch named CK1 to become the root bridge for a redundant path switched network. What can be done to ensure that CK1 will always assume the role as the root bridge?
Configure the switch so that it has lower priority than other switches in the network
Application
Transport
Buffering - Cut-through - and Congestion avoidance

38. 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?
ARP and ICMP
Auto - On - and Desirable
Sequence number - Window size - and Acknowledgment number
Application

39. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Sequence number - Window size - and Acknowledgment number
It is used to prevent switching loops in networks with redundant switched routes.
Hosts use a logical bus topology
Decrease the window size.

40. 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 sequence number in the TCP header.
In an improperly implemented redundant topology
Fiber optic cable.
100 meters

41. 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?
The network layer
To allow remote management of the switch.
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.
Packet switching - Packet filtering and Internetwork communication.

42. 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?
Hosts use a logical bus topology
The interfaces must be configured for NAT.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
The system is malfunctioning.

43. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
The port is experiencing errors
A cross-over cable
Network
VTP will allow switches to share VLAN configuration information

44. 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?
The port is experiencing errors
Increased latency and Filtering of all frame errors
Buffering - Cut-through - and Congestion avoidance
A hub and A repeater.

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 sequence number in the TCP header.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
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.
Network

46. Which of the following correctly describe the various functions and virtues of a router?
Packet switching - Packet filtering and Internetwork communication.
A cross-over cable
The network layer
100 meters

47. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
100 meters
All switch and bridge ports are in either the forwarding or blocking state.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

48. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
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.
Configure the switch so that it has lower priority than other switches in the network
VLAN and Swtich

49. Which OSI layer header contains the address of a destination host that is on another network?
To allow remote management of the switch.
Device Identifiers - Capabilities list - Platform
Network
VLAN and Swtich

50. 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?
VTP
Layer 4
The port is experiencing errors
Buffering - Cut-through - and Congestion avoidance

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