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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. 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 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.
The network layer
A hub and A repeater.
An additional broadcast domain will be created.

2. CDP is running between two CK devices. What information is supplied by CDP?
Auto - On - and Desirable
Device Identifiers - Capabilities list - Platform
The network layer
802.1Q and ISL

3. Which fields are included in the TCP header?
Layer 4
802.1Q and ISL
Switches increase the number of collision domains in the network.
Source Port - Acknowledgment Number - and Window

4. Which of the following devices can the Certkiller network administrator use to segment the 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
802.3ab and 802.3z
Switches - Bridges - and Routers
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. Why is full-duplex Ethernet superior to its single-duplex counterpart?
HTTPS - SMTP - and TFTP
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Port security
It operates without collisions and It provides faster data transfer

6. 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
Configure the switch so that it has lower priority than other switches in the network
Path selections and Packet switching.
100 meters
Duplex mismatch

7. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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.
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.
Physical Layer and Datalink Layer

8. 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?
Information about a route should never be sent back in the direction from which the original update came.
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.
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.
It operates without collisions and It provides faster data transfer

9. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Packet switching - Packet filtering and Internetwork communication.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

10. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
Increased latency and Filtering of all frame errors
Fiber optic cable.
This is an Ethernet port operating at half duplex
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

11. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Information about a route should never be sent back in the direction from which the original update came.
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.
Port security

12. 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?
Network
Decrease the window size.
STP
Configure the switch so that it has lower priority than other switches in the network

13. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
The system is malfunctioning.
Decrease the window size.
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.

14. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
STP
CertK Switch(config)# ip default-gateway 192.168.1.115
Show cdp neighbor detail
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

15. What is the purpose of the spanning-tree algorithm in a switched LAN?
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.
Duplex mismatch
STP
To prevent switching loops in networks with redundant switched paths.

16. Which of the following are spanning tree port states?
Telnet and FTP
Learning - Listening - and Forwarding
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Show arp and Show interface

17. 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?
SMTP FTP and HTTP
Telnet and FTP
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.

18. Which three of the protocols below belong to the application layer? (Select three answer choices)
Auto - On - and Desirable
HTTPS - SMTP - and TFTP
Layer 3
Fiber optic cable.

19. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
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.
Layer 4
Sequence number - Window size - and Acknowledgment number
TCP

20. 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
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Physical Layer and Datalink Layer
The network layer
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.

21. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
Show cdp neighbor detail
All switch and bridge ports are in either the forwarding or blocking state.
Auto - On - and Desirable
The network layer

22. 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?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
100 meters
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 sequence number in the TCP header.

23. 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?
Device Identifiers - Capabilities list - Platform
ARP and ICMP
Certkiller B > trace
The interfaces must be configured for NAT.

24. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
Hosts use a logical bus topology
Sequence number - Window size - and Acknowledgment number
SMTP - FTP - HTTP - and HTTPS
VTP will allow switches to share VLAN configuration information

25. Which of the protocols below use TCP at the transport layer?
Source Port - Acknowledgment Number - and Window
An electrical pulse indicates that the collision has cleared.
Packet switching - Packet filtering and Internetwork communication.
SMTP - FTP - HTTP - and HTTPS

26. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
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.
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.

27. 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?
Packet switching - Packet filtering and Internetwork communication.
VTP
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.
Application

28. 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?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Path selections and Packet switching.
100 meters
TCP

29. 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.)
Network
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
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
MAC Address and Bridge Priority

30. 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?
The system is malfunctioning.
Configure the switch so that it has a lower priority than other switches in the network.
The sequence number in the TCP header.
It is the sum of the costs based on bandwidth

31. 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?
ARP and ICMP
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
The network layer
Sequence number - Window size - and Acknowledgment number

32. 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?
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
Information about a route should never be sent back in the direction from which the original update came.
Layer 3
Port security

33. What are two characteristics of 'store and forward' switching?
To allow remote management of the switch.
Data link
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
SMTP FTP and HTTP

34. 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
HTTPS - SMTP - and TFTP
Switches - Bridges - and Routers
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

35. 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?
STP
Congestion avoidance - Windowing and Buffering
Certkiller B > trace
Layer 3

36. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Layer 4
Information about a route should never be sent back in the direction from which the original update came.
It is used to prevent switching loops in networks with redundant switched routes.
Switches increase the number of collision domains in the network.

37. 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 network layer
Configure the switch so that it has a lower priority than other switches in the network.
The Bridgeg ID and The bridge priority

38. Which protocol uses TCP port 443 at layer 4?
SMTP - FTP - HTTP - and HTTPS
HTTPS
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.

39. 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?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The sequence number in the TCP header.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Learning - Listening - and Forwarding

40. 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.
Layer 3
Network
100 meters

41. 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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Fiber optic cable.
Increased latency and Filtering of all frame errors
To allow remote management of the switch.

42. 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?
Sequence number - Window size - and Acknowledgment number
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Source Port - Acknowledgment Number - and Window

43. Which OSI layer header contains the address of a destination host that is on another network?
Hosts use a logical bus topology
To allow remote management of the switch.
Network
An electrical pulse indicates that the collision has cleared.

44. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Transport
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Layer 4
Serial0/1 is down - line protocol is down

45. By default - which of the following factors determines the spanning-tree path cost?
To prevent switching loops in networks with redundant switched paths.
It is the sum of the costs based on 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.
An additional broadcast domain will be created.

46. 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?
Show cdp neighbor detail
VTP
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
An additional broadcast domain will be created.

47. Which of the following correctly describe steps in the OSI date encapsulation process?
It will prevent segment 1's broadcasts from getting to segment 2.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Switches increase the number of collision domains in the network.
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. 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 port is experiencing errors
To allow remote management of the switch.
VLAN and Swtich
Certkiller B > trace

49. 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
VLAN and Swtich
SMTP FTP and HTTP
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

50. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Configure the switch so that it has a lower priority than other switches in the network.
Auto - On - and Desirable
TCP