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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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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.
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

2. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Application
It operates without collisions and It provides faster data transfer
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Transport

3. 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?
This is an Ethernet port operating at half duplex
The port is experiencing errors
802.3ab and 802.3z
HTTPS - SMTP - and TFTP

4. 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
VLAN and Swtich
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 will prevent segment 1's broadcasts from getting to segment 2.
Path selections and Packet switching.

5. 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
Hosts use a logical bus topology
Path selections and Packet switching.
The sequence number in the TCP header.
Fiber optic cable.

6. Which two of the following values does STP take into consideration when it elects the root bridge?
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 hub and A repeater.
The Bridgeg ID and The bridge priority
Data link

7. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
The system is malfunctioning.
The interfaces must be configured for NAT.
VLAN and Swtich
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.

8. 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?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
VLAN and Swtich
Telnet and FTP
Sequence number - Window size - and Acknowledgment number

9. Which of the following correctly describe steps in the OSI date encapsulation process?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
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
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. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
HTTPS
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Network

11. Which of the following devices can the Certkiller network administrator use to segment the LAN?
The Bridgeg ID and The bridge priority
VTP will allow switches to share VLAN configuration information
Switches - Bridges - and Routers
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

12. 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
The network layer
Show arp and Show interface
An electrical pulse indicates that the collision has cleared.
Switches increase the number of collision domains in the network.

13. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
CertK Switch(config)# ip default-gateway 192.168.1.115
The Bridgeg ID and The bridge priority
Increased latency and Filtering of all frame errors
Auto - Desirable - and On

14. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a 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
VLAN and Swtich
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.
Layer 4

15. 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
A broadcast domain with too many hosts - 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.

16. 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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17. By default - which of the following factors determines the spanning-tree path cost?
Switches increase the number of collision domains in the network.
VLAN and Swtich
Data link
It is the sum of the costs based on bandwidth

18. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
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.
Data link
Information about a route should never be sent back in the direction from which the original update came.
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.

19. 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
Auto - Desirable - and On
Switches - Bridges - and Routers
Duplex mismatch
It is the sum of the costs based on bandwidth

20. 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 Bridgeg ID and The bridge priority
SMTP FTP and HTTP
A hub and A repeater.
100 meters

21. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Network
HTTPS - SMTP - and TFTP
MAC Address and Bridge Priority
Sequence number - Window size - and Acknowledgment number

22. 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
The Bridgeg ID and The bridge priority
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
SMTP - FTP - HTTP - and HTTPS

23. 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?
Device Identifiers - Capabilities list - Platform
Configure the switch so that it has a lower priority than other switches in the network.
802.3ab and 802.3z
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

24. Which of the following correctly describe the various functions and virtues of a router?
Packet switching - Packet filtering and Internetwork communication.
A broadcast address will never be the source address of a frame
The system is malfunctioning.
Duplex mismatch

25. 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.
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.
Sequence number - Window size - and Acknowledgment number
Port security

26. 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 network layer
Application
The sequence number in the TCP header.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

27. 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
To prevent switching loops in networks with redundant switched paths.
Device Identifiers - Capabilities list - Platform
Source Port - Acknowledgment Number - and Window

28. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Configure the switch so that it has lower priority than other switches in the network
The interfaces must be configured for NAT.
Certkiller B > trace
It operates without collisions and It provides faster data transfer

29. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
The network layer
802.3ab and 802.3z
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.

30. With regard to Ethernet media access methods - which of the following are true?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Switches increase the number of collision domains in the 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.
VTP

31. Which of the following are true of Ethernet technology?
Hosts use a logical bus topology
Auto - On - and Desirable
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.
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.

32. 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?
Configure the switch so that it has a lower priority than other switches in the network.
The network layer
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
Serial0/1 is down - line protocol is down

33. Which of the following are spanning tree port states?
The network layer
A hub and A repeater.
VTP will allow switches to share VLAN configuration information
Learning - Listening - and Forwarding

34. Which protocol uses TCP port 443 at layer 4?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
802.1Q and ISL
HTTPS
Layer 4

35. 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?
Configure the switch so that it has a lower priority than other switches in the network.
The system is malfunctioning.
Information about a route should never be sent back in the direction from which the original update came.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

36. In a switched LAN network - What is the Spanning-Tree algorithm used for?
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
Switches increase the number of collision domains in the network.
It is used to prevent switching loops in networks with redundant switched routes.

37. 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?
Hosts use a logical bus topology
Port security
Telnet and FTP
Serial0/1 is down - line protocol is down

38. Which of the following services use TCP?
Layer 3
SMTP FTP and HTTP
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Device Identifiers - Capabilities list - Platform

39. 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.
Encapsulations PPP and authentication CHAP
Port security
Application
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

40. Which fields are included in the TCP header?
In an improperly implemented redundant topology
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Packet switching - Packet filtering and Internetwork communication.
Source Port - Acknowledgment Number - and Window

41. 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.
Auto - On - and Desirable
100 meters
A broadcast address will never be the source address of a frame

42. 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?
To allow remote management of the switch.
CertK Switch(config)# ip default-gateway 192.168.1.115
802.3ab and 802.3z
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.

43. 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?
The Bridgeg ID and The bridge priority
CertK Switch(config)# ip default-gateway 192.168.1.115
The interfaces must be configured for NAT.
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.

44. 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.)
Configure the switch so that it has 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.
MAC Address and Bridge Priority
TCP

45. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
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.
ARP and ICMP
Encapsulations PPP and authentication CHAP

46. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
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.
HTTPS

47. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Decrease the window size.
Path selections and Packet switching.
TCP
VTP will allow switches to share VLAN configuration information

48. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
TCP
MAC Address and Bridge Priority
STP
The port is experiencing errors

49. 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?
Sequence number - Window size - and Acknowledgment number
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
ARP and ICMP
It is the sum of the costs based on bandwidth

50. 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 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.
Decrease the window size.
The switch will forward the frame to a specific port
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router