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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. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

2. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
To prevent switching loops in networks with redundant switched paths.
Layer 4
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

3. 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?
Configure the switch so that it has a lower priority than other switches in the network.
Configure the switch so that it has lower priority than other switches in the network
Auto - On - and Desirable
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

4. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Application
Information about a route should never be sent back in the direction from which the original update came.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
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.

5. 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
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Data link
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.

6. 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.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Auto - Desirable - and On
All switch and bridge ports are in either the forwarding or blocking state.

7. 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?
To allow remote management of the switch.
Show cdp neighbor detail
Information about a route should never be sent back in the direction from which the original update came.
The Bridgeg ID and The bridge priority

8. By default - which of the following factors determines the spanning-tree path cost?
The port is experiencing errors
It is the sum of the costs based on bandwidth
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

9. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Data link
Switches increase the number of collision domains in the network.
802.1Q and ISL
An electrical pulse indicates that the collision has cleared.

10. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Fiber optic cable.
Network
MAC Address and Bridge Priority
An additional broadcast domain will be created.

11. Which fields are included in the TCP header?
Layer 4
Source Port - Acknowledgment Number - and Window
To prevent switching loops in networks with redundant switched paths.
Configure the switch so that it has lower priority than other switches in the network

12. 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
100 meters
Data link
VTP will allow switches to share VLAN configuration information

13. What is the purpose of the spanning-tree algorithm in a switched LAN?
Information about a route should never be sent back in the direction from which the original update came.
Network
To prevent switching loops in networks with redundant switched paths.
Buffering - Cut-through - and Congestion avoidance

14. 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 hub and A repeater.
VLAN and Swtich
Application
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.

15. 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
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.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
HTTPS

16. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Transport
The interfaces must be configured for NAT.
Layer 3
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.

17. 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?
This is an Ethernet port operating at half duplex
The network layer
Switches increase the number of collision domains in the network.
To prevent switching loops in networks with redundant switched paths.

18. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
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.
Switches increase the number of collision domains in the network.
Network
Auto - On - and Desirable

19. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
VTP
Switches increase the number of collision domains in the network.
Path selections and Packet switching.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

20. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Show arp and Show interface

21. 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?
Transport
A hub and A repeater.
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.

22. 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?
Network
To allow remote management of the switch.
A cross-over cable
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

23. 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.
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 port is experiencing errors
CertK Switch(config)# ip default-gateway 192.168.1.115

24. 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?
This is an Ethernet port operating at half duplex
Decrease the window size.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
It will prevent segment 1's broadcasts from getting to segment 2.

25. 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
Configure the switch so that it has a lower priority than other switches in the network.
Path selections and Packet switching.
VLAN and Swtich
Auto - Desirable - and On

26. Why is full-duplex Ethernet superior to its single-duplex counterpart?
It is the sum of the costs based on bandwidth
The network layer
It operates without collisions and It provides faster data transfer
Network

27. 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?
Telnet and FTP
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.
SMTP - FTP - HTTP - and HTTPS

28. 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.
Source Port - Acknowledgment Number - and Window
Increased latency and Filtering of all frame errors
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Application

29. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
It is the sum of the costs based on bandwidth
Data link
In an improperly implemented redundant topology
Encapsulations PPP and authentication CHAP

30. 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
It operates without collisions and It provides faster data transfer
Device Identifiers - Capabilities list - Platform
Path selections and Packet switching.

31. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
A broadcast address will never be the source address of a frame
The sequence number in the TCP header.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
An electrical pulse indicates that the collision has cleared.

32. 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 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 interfaces must be configured for NAT.
Increased latency and Filtering of all frame errors
Application

33. With regard to Ethernet media access methods - which of the following are true?
Port security
The sequence number in the TCP header.
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.

34. 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?
Source Port - Acknowledgment Number - and Window
All switch and bridge ports are in either the forwarding or blocking state.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Configure the switch so that it has a lower priority than other switches in the network.

35. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
VTP will allow switches to share VLAN configuration information
Layer 4
CertK Switch(config)# ip default-gateway 192.168.1.115
Serial0/1 is down - line protocol is down

36. 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 network layer
Hosts use a logical bus topology
Path selections and Packet switching.
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.

37. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
STP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Switches increase the number of collision domains in the network.
Decrease the window size.

38. Which of the following correctly describe the various functions and virtues of a router?
Network
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Packet switching - Packet filtering and Internetwork communication.
VTP will allow switches to share VLAN configuration information

39. 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?
Physical Layer and Datalink Layer
A cross-over cable
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Application

40. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
STP
The interfaces must be configured for NAT.
The network layer
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.

41. 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?
A broadcast address will never be the source address of a frame
VTP
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Certkiller B > trace

42. 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
SMTP FTP and HTTP
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
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The sequence number in the TCP header.

43. Which two of the following values does STP take into consideration when it elects the root bridge?
Configure the switch so that it has a lower priority than other switches in the network.
Auto - On - and Desirable
The Bridgeg ID and The bridge priority
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

44. 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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45. 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?
It is used to prevent switching loops in networks with redundant switched routes.
Network
Application
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.

46. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
SMTP FTP and HTTP
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.
TCP
Network

47. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
Switches - Bridges - and Routers
Switches increase the number of collision domains in the network.
Path selections and Packet switching.

48. CDP is running between two CK devices. What information is supplied by CDP?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Device Identifiers - Capabilities list - Platform
It will prevent segment 1's broadcasts from getting to segment 2.
Network

49. 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.
Physical Layer and Datalink Layer
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
802.3ab and 802.3z

50. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
The network layer
An electrical pulse indicates that the collision has cleared.
HTTPS