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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. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
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.
Layer 4
Fiber optic cable.
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.

2. A Certkiller Ethernet switch receives a unicast frame with a destination MAC that IS listed in the switch table. What will this switch do with the frame?
Application
The switch will forward the frame to a specific port
SMTP - FTP - HTTP - and HTTPS
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.

3. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
A hub and A repeater.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Buffering - Cut-through - and Congestion avoidance
Packet switching - Packet filtering and Internetwork communication.

4. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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.
An additional broadcast domain will be created.
Encapsulations PPP and authentication CHAP

5. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Application
Layer 4
The switch will forward the frame to a specific port
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

6. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Network
A cross-over cable
To prevent switching loops in networks with redundant switched paths.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

7. With regard to Ethernet media access methods - which of the following are true?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
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.
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 is the sum of the costs based on bandwidth

8. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Configure the switch so that it has a lower priority than other switches in the network.
An additional broadcast domain will be created.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
ARP and ICMP

9. 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 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.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
STP

10. What are two characteristics of 'store and forward' switching?
A broadcast address will never be the source address of a frame
The Bridgeg ID and The bridge priority
Transport
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

11. Which of the following are spanning tree port states?
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.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Learning - Listening - and Forwarding
To allow remote management of the switch.

12. Which of the following devices can the Certkiller network administrator use to segment the LAN?
The system is malfunctioning.
VLAN and Swtich
Switches - Bridges - and Routers
TCP

13. Which three of the protocols below belong to the application layer? (Select three answer choices)
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.
VTP will allow switches to share VLAN configuration information
Source Port - Acknowledgment Number - and Window
HTTPS - SMTP - and TFTP

14. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
The interfaces must be configured for NAT.
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.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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

15. By default - which of the following factors determines the spanning-tree path cost?
ARP and ICMP
Show arp and Show interface
A broadcast address will never be the source address of a frame
It is the sum of the costs based on bandwidth

16. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Source Port - Acknowledgment Number - and Window
Network
Configure the switch so that it has a lower priority than other switches 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.

17. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
The port is experiencing errors
Certkiller B > trace
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
All switch and bridge ports are in either the forwarding or blocking state.

18. 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?
Data link
Port security
Layer 4
Telnet and FTP

19. 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?
Learning - Listening - and Forwarding
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Port security
Decrease the window size.

20. 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.)
Information about a route should never be sent back in the direction from which the original update came.
Physical Layer and Datalink Layer
MAC Address and Bridge Priority
Data link

21. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
802.1Q and ISL
The system is malfunctioning.
The network layer
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

22. 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?
Auto - Desirable - and On
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Information about a route should never be sent back in the direction from which the original update came.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

23. A new switch is installed in the Certkiller network. This switch is to be configured so that VLAN information will be automatically distributed to all the other Cisco Catalyst switches in the network. Which of the conditions below have to be met in o
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 switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
SMTP FTP and HTTP
An electrical pulse indicates that the collision has cleared.

24. CDP is running between two CK devices. What information is supplied by CDP?
Fiber optic cable.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Device Identifiers - Capabilities list - Platform
Decrease the window size.

25. 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?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Congestion avoidance - Windowing and Buffering
Serial0/1 is down - line protocol is down
It is the sum of the costs based on bandwidth

26. 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
A hub and A repeater.
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.
Show cdp neighbor detail
Show arp and Show interface

27. 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?
ARP and ICMP
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
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

28. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
The network layer
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Sequence number - Window size - and Acknowledgment number
Serial0/1 is down - line protocol is down

29. 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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30. 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.
The sequence number in the TCP header.
Sequence number - Window size - and Acknowledgment number
Layer 3

31. 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
Auto - On - and Desirable
Packet switching - Packet filtering and Internetwork communication.
The network layer

32. 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?
The network layer
Increased latency and Filtering of all frame errors
HTTPS - SMTP - and TFTP
Application

33. Which protocol uses TCP port 443 at layer 4?
The port is experiencing errors
HTTPS
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Show arp and Show interface

34. A Certkiller technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the sh
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
This is an Ethernet port operating at half duplex
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.
Data link

35. Which of the following are true of Ethernet technology?
Hosts use a logical bus topology
A broadcast address will never be the source address of a frame
This is an Ethernet port operating at half duplex
Fiber optic cable.

36. What is the IEEE standard associated with Gigabit Ethernet?
802.3ab and 802.3z
Show arp and Show interface
It operates without collisions and It provides faster data transfer
SMTP - FTP - HTTP - and HTTPS

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?
Port security
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.
Encapsulations PPP and authentication CHAP
The switch will forward the frame to a specific port

38. 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?
Port security
Network
Buffering - Cut-through - and Congestion avoidance
Switches increase the number of collision domains in the network.

39. 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?
Certkiller B > trace
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
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.

40. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Data link
Certkiller B > trace
A hub and A repeater.
Auto - On - and Desirable

41. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
A cross-over cable
A hub and A repeater.
To allow remote management of the switch.

42. 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
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.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
SMTP FTP and HTTP
Auto - Desirable - and On

43. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
An additional broadcast domain will be created.
Data link
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

44. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Data link
Layer 3
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
ARP and ICMP

45. 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.
Hosts use a logical bus topology
Show cdp neighbor detail
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

46. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
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.
TCP
To allow remote management of the switch.
802.1Q and ISL

47. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Switches increase the number of collision domains in the network.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Congestion avoidance - Windowing and Buffering
Application

48. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
802.3ab and 802.3z
An electrical pulse indicates that the collision has cleared.
Learning - Listening - and Forwarding

49. 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?
Network
An additional broadcast domain will be created.
Learning - Listening - and Forwarding
Hosts use a logical bus topology

50. Which of the following correctly describe the various functions and virtues of a router?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Switches increase the number of collision domains in the network.
Packet switching - Packet filtering and Internetwork communication.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.