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CCNA Hard

Instructions:

Answer 50 questions in 15 minutes.
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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. 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.
The port is experiencing errors
The sequence number in the TCP header.
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 of the following correctly describe the various functions and virtues of a router?
A hub and A repeater.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Duplex mismatch
Packet switching - Packet filtering and Internetwork communication.

3. 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?
Sequence number - Window size - and Acknowledgment number
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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.

4. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
TCP
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 network layer
Layer 3

5. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Certkiller B > trace
Layer 4
VTP
It is used to prevent switching loops in networks with redundant switched routes.

6. What kind of cable should be used to establish a trunked line between two Catalyst switches?
A cross-over cable
Device Identifiers - Capabilities list - Platform
Certkiller B > trace
Physical Layer and Datalink Layer

7. 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
Application
Decrease the window size.
An additional broadcast domain will be created.

8. 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 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.
Path selections and Packet switching.
Device Identifiers - Capabilities list - Platform

9. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
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
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.
Switches increase the number of collision domains in the network.
A hub and A repeater.

10. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
The sequence number in the TCP header.
Serial0/1 is down - line protocol is down
It is used to prevent switching loops in networks with redundant switched routes.
The network layer

11. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
In an improperly implemented redundant topology
Layer 4
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
TCP

12. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
802.1Q and ISL
Port security
HTTPS
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

13. 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?
Path selections and Packet switching.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Telnet and FTP

14. What are two characteristics of 'store and forward' switching?
Network
Switches increase the number of collision domains in the network.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Decrease the window size.

15. 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.
MAC Address and Bridge Priority
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Network

16. You need to configure two Certkiller switches to exchange VLAN information. Which protocol provides a method of sharing VLAN configuration information between these two switches?
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
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
VTP

17. Which of the protocols below use TCP at the transport 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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
SMTP - FTP - HTTP - and HTTPS
Network

18. CDP is running between two CK devices. What information is supplied by CDP?
Switches increase the number of collision domains in the network.
Device Identifiers - Capabilities list - Platform
TCP
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

19. The Certkiller network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?
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.
802.3ab and 802.3z
Auto - On - and Desirable
ARP and ICMP

20. 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 switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Telnet and FTP
Network
Show arp and Show interface

21. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
Layer 4
Hosts use a logical bus topology
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

22. 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?
An electrical pulse indicates that the collision has cleared.
Network
Path selections and Packet switching.
Configure the switch so that it has a lower priority than other switches in the network.

23. 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
Duplex mismatch
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.
802.3ab and 802.3z
HTTPS

24. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
VTP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Auto - Desirable - and On
Network

25. 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?
Configure the switch so that it has a lower priority than other switches in the network.
Application
All switch and bridge ports are in either the forwarding or blocking state.
Switches increase the number of collision domains in the network.

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?
Layer 4
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Network
Application

27. 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?
SMTP FTP and HTTP
Increased latency and Filtering of all frame errors
To allow remote management of the switch.
802.3ab and 802.3z

28. Which of the following services use TCP?
SMTP FTP and HTTP
802.3ab and 802.3z
100 meters
The sequence number in the TCP header.

29. Why is full-duplex Ethernet superior to its single-duplex counterpart?
A hub and A repeater.
It operates without collisions and It provides faster data transfer
It is used to prevent switching loops in networks with redundant switched routes.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

30. 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?
802.3ab and 802.3z
802.1Q and ISL
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

31. 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?
Learning - Listening - and Forwarding
Data link
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 will prevent segment 1's broadcasts from getting to segment 2.

32. Which three of the protocols below belong to the application layer? (Select three answer choices)
Duplex mismatch
HTTPS - SMTP - and TFTP
A cross-over 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.

33. 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?
An electrical pulse indicates that the collision has cleared.
Hosts use a logical bus topology
The port is experiencing errors
A hub and A repeater.

34. 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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35. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Auto - Desirable - and On
Configure the switch so that it has a lower priority than other switches in the network.
Information about a route should never be sent back in the direction from which the original update came.
It operates without collisions and It provides faster data transfer

36. 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
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.
SMTP - FTP - HTTP - and HTTPS
Device Identifiers - Capabilities list - Platform

37. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
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.
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.
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.

38. Which of the following are true of Ethernet technology?
Congestion avoidance - Windowing and Buffering
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.
Hosts use a logical bus topology
Switches - Bridges - and Routers

39. 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?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
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.
Switches increase the number of collision domains in the network.

40. 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?
Port security
TCP
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 throughout than can half-duplex Ethernet of the same bandwidth

41. 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.
Application
Configure the switch so that it has lower priority than other switches in the network
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
TCP

42. 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)
Duplex mismatch
Switches increase the number of collision domains in the network.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The switch will forward the frame to a specific port

43. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
The Bridgeg ID and The bridge priority
Application
An electrical pulse indicates that the collision has cleared.
Switches increase the number of collision domains in the network.

44. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to 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.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Allowing simultaneous frame transmissions and filtering frames based on MAC 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

45. 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
Data link
This is an Ethernet port operating at 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.

46. Which OSI layer header contains the address of a destination host that is on another network?
HTTPS
Network
Configure the switch so that it has lower priority than other switches in the network
SMTP - FTP - HTTP - and HTTPS

47. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Switches increase the number of collision domains in the network.
Auto - On - and Desirable
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
Path selections and Packet switching.

48. 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?
802.3ab and 802.3z
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
Transport

49. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
STP
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.

50. Which of the following are spanning tree port states?
To allow remote management of the switch.
Decrease the window size.
Learning - Listening - and Forwarding
The sequence number in the TCP header.

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