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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. 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?
Physical Layer and Datalink Layer
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Congestion avoidance - Windowing and Buffering
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.

2. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
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.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

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?
Certkiller B > trace
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
This is an Ethernet port operating at half duplex
Switches increase the number of collision domains in the network.

4. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
Source Port - Acknowledgment Number - and Window
In an improperly implemented redundant topology
Show cdp neighbor detail
It operates without collisions and It provides faster data transfer

5. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
Auto - Desirable - and On
Configure the switch so that it has lower priority than other switches in the network
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Auto - On - and Desirable

6. when files are transferred between a host and an FTP server - the data is divided into smaller pieces of transmission. As these pieces arrive at the destination host they must be reassembled to reconstruct the original file. What provides for the rea
All switch and bridge ports are in either the forwarding or blocking state.
The sequence number in the TCP header.
Learning - Listening - and Forwarding
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

7. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Data link
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Encapsulations PPP and authentication CHAP
Congestion avoidance - Windowing and Buffering

8. 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
Physical Layer and Datalink Layer
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
The network layer

9. A Certkiller switch is configured with all ports assigned to VLAN 2. In addition - all ports are configured as full-duplex FastEthernet. What is the effect of adding switch ports to a new VLAN on this switch?
Data link
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 a lower priority than other switches in the network.
An additional broadcast domain will be created.

10. 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.
Learning - Listening - and Forwarding
An additional broadcast domain will be created.
Data link

11. 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)
Application
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The Bridgeg ID and The bridge priority
A broadcast address will never be the source address of a frame

12. 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
Information about a route should never be sent back in the direction from which the original update came.
Packet switching - Packet filtering and Internetwork communication.
A broadcast address will never be the source address of a frame
Duplex mismatch

13. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
A cross-over cable
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.
Port security
802.1Q and ISL

14. 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.
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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

15. 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?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
A hub and A repeater.
Application
Configure the switch so that it has lower priority than other switches in the network

16. 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?
Layer 4
The interfaces must be configured for NAT.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Certkiller B > trace

17. 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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
TCP
STP

18. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Certkiller B > trace
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.
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.
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

19. 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.
Certkiller B > trace
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
The switch will forward the frame to a specific port

20. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
802.3ab and 802.3z
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
An additional broadcast domain will be created.

21. 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?
Decrease the window size.
Port security
Physical Layer and Datalink 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.

22. 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?
Buffering - Cut-through - and Congestion avoidance
Application
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
HTTPS - SMTP - and TFTP

23. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
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.
TCP
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
Configure the switch so that it has a lower priority than other switches in the network.

24. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Decrease the window size.
The network layer
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.

25. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Transport
Layer 4
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.
Data link

26. Which OSI layer header contains the address of a destination host that is on another network?
Buffering - Cut-through - and Congestion avoidance
Decrease the window size.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Network

27. 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?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
All switch and bridge ports are in either the forwarding or blocking state.
Sequence number - Window size - and Acknowledgment number
It will prevent segment 1's broadcasts from getting to segment 2.

28. 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
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Certkiller B > trace
Fiber optic cable.

29. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
An additional broadcast domain will be created.
Network
All switch and bridge ports are in either the forwarding or blocking state.
CertK Switch(config)# ip default-gateway 192.168.1.115

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?
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 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.
Buffering - Cut-through - and Congestion avoidance
CertK Switch(config)# ip default-gateway 192.168.1.115

31. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
It will prevent segment 1's broadcasts from getting to segment 2.
Auto - On - and Desirable
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.
A hub and A repeater.

32. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Layer 3
Switches increase the number of collision domains in the network.
Network
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

33. Cisco is the leader in the router market space. What basic functions do their routers perform in a 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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Sequence number - Window size - and Acknowledgment number
Path selections and Packet switching.

34. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
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.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Transport

35. 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
Layer 4
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
The switch will forward the frame to a specific port

36. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Encapsulations PPP and authentication CHAP
Decrease the window size.
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
Layer 4

37. Which of the following can lead to the contribution of LAN traffic congestion?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Learning - Listening - and Forwarding
100 meters

38. What is the purpose of the spanning-tree algorithm in a switched LAN?
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
Buffering - Cut-through - and Congestion avoidance
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
To prevent switching loops in networks with redundant switched paths.

39. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
It is the sum of the costs based on bandwidth
To prevent switching loops in networks with redundant switched paths.
Buffering - Cut-through - and Congestion avoidance
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

40. Which of the following services use TCP?
Learning - Listening - and Forwarding
SMTP FTP and HTTP
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
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.

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?
It operates without collisions and It provides faster data transfer
Network
Decrease the window size.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

42. 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?
Configure the switch so that it has lower priority than other switches in the network
100 meters
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.

43. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
A hub and A repeater.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Layer 3

44. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
HTTPS - SMTP - and TFTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
VTP

45. With regard to Ethernet media access methods - which of the following are true?
All switch and bridge ports are in either the forwarding or blocking state.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

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?
This is an Ethernet port operating at half duplex
Serial0/1 is down - line protocol is down
Show cdp neighbor detail
Network

47. Which fields are included in the TCP header?
TCP
A hub and A repeater.
Source Port - Acknowledgment Number - and Window
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.

48. 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.
Path selections and Packet switching.
This is an Ethernet port operating at half duplex
Decrease the window size.

49. 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 switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
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

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
Fiber optic cable.
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.
Show arp and Show interface
MAC Address and Bridge Priority