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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. 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?
Application
Decrease the window size.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
In an improperly implemented redundant topology

2. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
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 Bridgeg ID and The bridge priority
All switch and bridge ports are in either the forwarding or blocking state.
Certkiller B > trace

3. 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?
It operates without collisions and It provides faster data transfer
MAC Address and Bridge Priority
Increased latency and Filtering of all frame errors
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.

4. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Certkiller B > trace
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.
An additional broadcast domain will be created.
The switch will forward the frame to a specific port

5. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Information about a route should never be sent back in the direction from which the original update came.
An additional broadcast domain will be created.

6. Which three of the protocols below belong to the application layer? (Select three answer choices)
Show cdp neighbor detail
Telnet and FTP
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.
HTTPS - SMTP - and TFTP

7. 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
Learning - Listening - and Forwarding
Data link
Auto - Desirable - and On
ARP and ICMP

8. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VLAN and Swtich
Transport
An electrical pulse indicates that the collision has cleared.

9. 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?
Show cdp neighbor detail
802.1Q and ISL
Port security
TCP

10. 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
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Learning - Listening - and Forwarding
All switch and bridge ports are in either the forwarding or blocking state.

11. 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.)
ARP and ICMP
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
MAC Address and Bridge Priority
STP

12. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
It will prevent segment 1's broadcasts from getting to segment 2.
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.
Device Identifiers - Capabilities list - Platform
Network

13. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Network
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
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.

14. Which of the following correctly describe steps in the OSI date encapsulation process?
Data link
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.
Duplex mismatch
Application

15. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Switches - Bridges - and Routers
Auto - On - and Desirable
Application
Configure the switch so that it has a lower priority than other switches in the network.

16. 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?
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
Auto - Desirable - and On
All switch and bridge ports are in either the forwarding or blocking state.
VLAN and Swtich

17. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
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
Source Port - Acknowledgment Number - and Window
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

18. Which protocol uses TCP port 443 at layer 4?
HTTPS
Fiber optic cable.
VTP will allow switches to share VLAN configuration information
100 meters

19. 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?
A broadcast address will never be the source address of a frame
An additional broadcast domain will be created.
Increased latency and Filtering of all frame errors
Source Port - Acknowledgment Number - and Window

20. 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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21. 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?
Layer 4
Congestion avoidance - Windowing and Buffering
Learning - Listening - and Forwarding
A hub and A repeater.

22. Which of the following are spanning tree port states?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
The sequence number in the TCP header.
Switches increase the number of collision domains in the network.
Learning - Listening - and Forwarding

23. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
STP
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
To allow remote management of the switch.
Layer 4

24. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
CertK Switch(config)# ip default-gateway 192.168.1.115
To allow remote management of the switch.
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.

25. 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
VLAN and Swtich
TCP
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

26. Which fields are included in the TCP header?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
In an improperly implemented redundant topology
Source Port - Acknowledgment Number - and Window
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

27. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
VTP will allow switches to share VLAN configuration information
A hub and A repeater.
Information about a route should never be sent back in the direction from which the original update came.
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.

28. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Configure the switch so that it has lower priority than other switches in the network
Network
Switches - Bridges - and Routers
TCP

29. Which of the following are types of flow control?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Buffering - Cut-through - and Congestion avoidance
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
It is the sum of the costs based on bandwidth

30. With regard to Ethernet media access methods - which of the following are true?
Device Identifiers - Capabilities list - Platform
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.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

31. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Switches increase the number of collision domains in the network.
Serial0/1 is down - line protocol is down
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Application

32. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
It will prevent segment 1's broadcasts from getting to segment 2.
Configure the switch so that it has a lower priority than other switches in the network.
Sequence number - Window size - and Acknowledgment number

33. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller 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
SMTP FTP and HTTP
Sequence number - Window size - and Acknowledgment number
HTTPS - SMTP - and TFTP

34. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
The system is malfunctioning.
Hosts use a logical bus topology
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.

35. 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?
Learning - Listening - and Forwarding
Port security
Fiber optic cable.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

36. 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?
Congestion avoidance - Windowing and Buffering
Layer 4
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Configure the switch so that it has a lower priority than other switches in the network.

37. In a switched LAN network - What is the Spanning-Tree algorithm used for?
A hub and A repeater.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
It is used to prevent switching loops in networks with redundant switched routes.
VLAN and Swtich

38. 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.
A cross-over cable
Application
Packet switching - Packet filtering and Internetwork communication.
HTTPS - SMTP - and TFTP

39. 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
Port security
MAC Address and Bridge Priority
Transport
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.

40. Which of the following services use TCP?
HTTPS - SMTP - and TFTP
Source Port - Acknowledgment Number - and Window
SMTP FTP and HTTP
An electrical pulse indicates that the collision has cleared.

41. What kind of cable should be used to establish a trunked line between two Catalyst switches?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
A cross-over cable
Transport
Source Port - Acknowledgment Number - and Window

42. Which of the following can lead to the contribution of LAN traffic congestion?
CertK Switch(config)# ip default-gateway 192.168.1.115
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.

43. 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?
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 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.
Congestion avoidance - Windowing and Buffering
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.

44. 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
The Bridgeg ID and The bridge priority
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Network
Layer 4

45. 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
Packet switching - Packet filtering and Internetwork communication.
The network layer
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
Duplex mismatch

46. Which of the following correctly describe the various functions and virtues of a router?
Auto - On - and Desirable
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
Packet switching - Packet filtering and Internetwork communication.

47. While troubleshooting a connectivity problem - the Certkiller network administrator notices that a port status LED on a Cisco Catalyst Series switch is alternating between green and amber. Which condition could this indicate?
It is used to prevent switching loops in networks with redundant switched routes.
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.
The port is experiencing errors
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

48. 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?
The network 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.
Device Identifiers - Capabilities list - Platform
Configure the switch so that it has lower priority than other switches in the network

49. 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)
Buffering - Cut-through - and Congestion avoidance
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
This is an Ethernet port operating at half duplex
A broadcast address will never be the source address of a frame

50. 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?
TCP
It operates without collisions and It provides faster data transfer
VTP will allow switches to share VLAN configuration information
Sequence number - Window size - and Acknowledgment number

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