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CCNA Hard

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. 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?
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
VTP
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 port is experiencing errors

2. Which of the following can lead to the contribution of LAN traffic congestion?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Physical Layer and Datalink 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.
The network layer

3. 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
VTP will allow switches to share VLAN configuration information
The sequence number in the TCP header.
VLAN and Swtich
HTTPS

4. Which of the following are spanning tree port states?
Certkiller B > trace
Learning - Listening - and Forwarding
Application
Hosts use a logical bus topology

5. 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?
Fiber optic cable.
Data link
Certkiller B > trace
The network layer

6. 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?
Decrease the window size.
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
Path selections and Packet switching.
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.

7. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
It is the sum of the costs based on bandwidth
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
The interfaces must be configured for NAT.
Congestion avoidance - Windowing and Buffering

8. 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?
It is used to prevent switching loops in networks with redundant switched routes.
The switch will forward the frame to a specific port
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 CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

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?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
To prevent switching loops in networks with redundant switched paths.
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.
Certkiller B > trace

10. Which of the following correctly describe steps in the OSI date encapsulation process?
In an improperly implemented redundant topology
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.
The system is malfunctioning.
All switch and bridge ports are in either the forwarding or blocking state.

11. 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.
Network
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
To prevent switching loops in networks with redundant switched paths.

12. 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
Network
802.1Q and ISL
Fiber optic cable.
A hub and A repeater.

13. 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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
To prevent switching loops in networks with redundant switched paths.
It is used to prevent switching loops in networks with redundant switched routes.
VTP

14. 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?
Source Port - Acknowledgment Number - and Window
Application
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.
Sequence number - Window size - and Acknowledgment number

15. As a Certkiller trainee you are required to set the default gateway on a Cisco switch to the IP address of 192.168.1.115. Which IOS command should you use?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
CertK Switch(config)# ip default-gateway 192.168.1.115
The network layer
SMTP FTP and HTTP

16. 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?
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.
Network
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 port is experiencing errors

17. 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?
Congestion avoidance - Windowing and Buffering
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.
STP
This is an Ethernet port operating at half duplex

18. 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?
Application
Layer 3
Configure the switch so that it has a lower priority than other switches in the network.
An additional broadcast domain will be created.

19. 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?
100 meters
STP
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.
Configure the switch so that it has lower priority than other switches in the network

20. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
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.
802.1Q and ISL
To prevent switching loops in networks with redundant switched paths.
HTTPS

21. 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?
Switches increase the number of collision domains in the network.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
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.
Learning - Listening - and Forwarding

22. 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
The system is malfunctioning.
Data link
It operates without collisions and It provides faster data transfer
Layer 4

23. 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.
Device Identifiers - Capabilities list - Platform
HTTPS - SMTP - and TFTP
Switches increase the number of collision domains in the network.

24. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
It is the sum of the costs based on bandwidth
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
MAC Address and Bridge Priority
The port is experiencing errors

25. 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
Data link
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Show arp and Show interface
A broadcast address will never be the source address of a frame

26. What is the IEEE standard associated with Gigabit Ethernet?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
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.
Application
802.3ab and 802.3z

27. Which of the following services use TCP?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
To prevent switching loops in networks with redundant switched paths.
VTP will allow switches to share VLAN configuration information
SMTP FTP and HTTP

28. 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?
STP
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
It will prevent segment 1's broadcasts from getting to segment 2.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

29. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
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.
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
The network layer

30. 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.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
CertK Switch(config)# ip default-gateway 192.168.1.115
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same 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?
SMTP FTP and HTTP
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The network layer
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

32. What kind of cable should be used to establish a trunked line between two Catalyst switches?
It is used to prevent switching loops in networks with redundant switched routes.
STP
A cross-over cable
The network layer

33. 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?
All switch and bridge ports are in either the forwarding or blocking state.
It is used to prevent switching loops in networks with redundant switched routes.
Physical Layer and Datalink Layer
Increased latency and Filtering of all frame errors

34. 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?
Decrease the window size.
SMTP - FTP - HTTP - and HTTPS
Duplex mismatch
Switches - Bridges - and Routers

35. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
It operates without collisions and It provides faster data transfer
Serial0/1 is down - line protocol is down
Device Identifiers - Capabilities list - Platform
Fiber optic cable.

36. 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?
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 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
100 meters

37. 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?
Configure the switch so that it has a lower priority than other switches in the network.
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.
STP
All switch and bridge ports are in either the forwarding or blocking state.

38. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Show arp and Show interface
Configure the switch so that it has a lower priority than other switches in the network.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

39. 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?
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.
To allow remote management of the switch.
Application
Buffering - Cut-through - and Congestion avoidance

40. Which of the following correctly describe the various functions and virtues of a router?
An electrical pulse indicates that the collision has cleared.
Packet switching - Packet filtering and Internetwork communication.
To allow remote management of the switch.
Show cdp neighbor detail

41. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
TCP
Encapsulations PPP and authentication CHAP
The network layer
STP

42. 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.
802.3ab and 802.3z
TCP
Sequence number - Window size - and Acknowledgment number

43. 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?
Configure the switch so that it has a lower priority than other switches in the network.
VTP
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The sequence number in the TCP header.

44. 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
STP
Encapsulations PPP and authentication CHAP
Path selections and Packet switching.
Duplex mismatch

45. With regard to Ethernet media access methods - which of the following are true?
Data link
It will prevent segment 1's broadcasts from getting to segment 2.
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.
Certkiller B > trace

46. 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.)
HTTPS - SMTP - and TFTP
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
MAC Address and Bridge Priority
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.

47. Which two of the following values does STP take into consideration when it elects the root bridge?
This is an Ethernet port operating at half duplex
The Bridgeg ID and The bridge priority
Fiber optic cable.
VLAN and Swtich

48. 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?
Application
STP
VTP
Port security

49. 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?
Telnet and FTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
802.3ab and 802.3z
It is the sum of the costs based on bandwidth

50. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
HTTPS
The sequence number in the TCP header.
VTP will allow switches to share VLAN configuration information
Switches increase the number of collision domains in the network.

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