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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. 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 switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Path selections and Packet switching.
Sequence number - Window size - and Acknowledgment number

2. 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
Telnet and FTP
Congestion avoidance - Windowing and Buffering
This is an Ethernet port operating at half duplex
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.

3. You want to influence the root bridge selection within the Certkiller LAN. Which two values are used by spanning tree protocol to elect a root bridge? (Choose two.)
MAC Address and Bridge Priority
It will prevent segment 1's broadcasts from getting to segment 2.
A broadcast address will never be the source address of a frame
To prevent switching loops in networks with redundant switched paths.

4. 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?
Network
Increased latency and Filtering of all frame errors
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
100 meters

5. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Decrease the window size.
It is used to prevent switching loops in networks with redundant switched routes.
Data link
To allow remote management of the switch.

6. 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
Learning - Listening - and Forwarding
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Decrease the window size.
Fiber optic cable.

7. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
A hub and A repeater.
VTP

8. 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?
Increased latency and Filtering of all frame errors
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.
An electrical pulse indicates that the collision has cleared.
Information about a route should never be sent back in the direction from which the original update came.

9. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Data link
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Show cdp neighbor detail
VTP will allow switches to share VLAN configuration information

10. 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)
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
STP
The sequence number in the TCP header.
Application

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
Data link
To prevent switching loops in networks with redundant switched paths.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Hosts use a logical bus topology

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?
Physical Layer and Datalink Layer
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Auto - Desirable - and On
MAC Address and Bridge Priority

13. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Packet switching - Packet filtering and Internetwork communication.
It will prevent segment 1's broadcasts from getting to segment 2.
Network
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

14. 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.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
802.1Q and ISL
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

15. 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
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
The network layer
Application
Data link

16. Which three of the protocols below belong to the application layer? (Select three answer choices)
CertK Switch(config)# ip default-gateway 192.168.1.115
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Port security
HTTPS - SMTP - and TFTP

17. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
An electrical pulse indicates that the collision has cleared.
The switch will forward the frame to a specific port
It is used to prevent switching loops in networks with redundant switched routes.

18. 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?
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
Auto - On - and Desirable
Device Identifiers - Capabilities list - Platform

19. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Source Port - Acknowledgment Number - and Window
The Bridgeg ID and The bridge priority
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

20. 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?

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21. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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.
100 meters
Transport

22. 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
Buffering - Cut-through - and Congestion avoidance
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.
In an improperly implemented redundant topology

23. 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?
Congestion avoidance - Windowing and Buffering
A hub and A repeater.
Device Identifiers - Capabilities list - Platform
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

24. 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
Port security
HTTPS - SMTP - and TFTP
SMTP FTP and HTTP
VLAN and Swtich

25. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
This is an Ethernet port operating at half duplex
Transport
Switches - Bridges - and Routers
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

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?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
HTTPS
Configure the switch so that it has a lower priority than other switches in the network.
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 the following can lead to the contribution of LAN traffic congestion?
A cross-over cable
Configure the switch so that it has lower priority than other switches in the network
VLAN and Swtich
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

28. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
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 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 network layer
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

29. 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
Layer 4
The system is malfunctioning.
Packet switching - Packet filtering and Internetwork communication.

30. 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
Port security
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.
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

31. Which of the following are spanning tree port states?
Learning - Listening - and Forwarding
A cross-over cable
Switches increase the number of collision domains in the network.
Transport

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?
The network layer
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
Certkiller B > trace
A broadcast address will never be the source address of a frame

33. 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?
Data link
Application
MAC Address and Bridge Priority
Congestion avoidance - Windowing and Buffering

34. 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
Network
This is an Ethernet port operating at half duplex
Duplex mismatch
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

35. Which of the following correctly describe steps in the OSI date encapsulation process?
Layer 4
Sequence number - Window size - and Acknowledgment number
Serial0/1 is down - line protocol is down
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.

36. By default - which of the following factors determines the spanning-tree path cost?
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
It is used to prevent switching loops in networks with redundant switched routes.
It is the sum of the costs based on 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?
A hub and A repeater.
Auto - On - and Desirable
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.

38. 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?
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.
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
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
A broadcast address will never be the source address of a frame

39. 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?
The interfaces must be configured for NAT.
Hosts use a logical bus topology
An additional broadcast domain will be created.
Switches increase the number of collision domains in the network.

40. 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
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
Certkiller B > trace

41. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
A broadcast address will never be the source address of a frame
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.
Path selections and Packet switching.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

42. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Application
Auto - On - and Desirable
Layer 3

43. 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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
SMTP - FTP - HTTP - and HTTPS
Duplex mismatch
A hub and A repeater.

44. Which line from the output of the show ip interface command indicates that there is a Layer 1 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.
Serial0/1 is down - line protocol is down
HTTPS - SMTP - and TFTP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

45. 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.
To prevent switching loops in networks with redundant switched paths.
Certkiller B > trace
Configure the switch so that it has a lower priority than other switches in the network.

46. 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?
VTP
Telnet and FTP
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.

47. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
VTP
Layer 4
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

48. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
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.
Encapsulations PPP and authentication CHAP
Network
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

49. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Congestion avoidance - Windowing and Buffering
802.3ab and 802.3z
Physical Layer and Datalink Layer

50. 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
Port security
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Fiber optic cable.

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