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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. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
An additional broadcast domain will be created.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Source Port - Acknowledgment Number - and Window
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. 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?
To allow remote management of the switch.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
VTP will allow switches to share VLAN configuration information
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

3. 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
Switches increase the number of collision domains in the network.
Decrease the window size.
Configure the switch so that it has a lower priority than other switches in the network.

4. 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.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
An additional broadcast domain will be created.
Application
The system is malfunctioning.

5. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
Layer 4
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.
Network
In an improperly implemented redundant topology

6. By default - which of the following factors determines the spanning-tree path cost?
Application
It is the sum of the costs based on bandwidth
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.
It will prevent segment 1's broadcasts from getting to segment 2.

7. 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?
This is an Ethernet port operating at half duplex
To allow remote management of the switch.
CertK Switch(config)# ip default-gateway 192.168.1.115
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.

8. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Telnet and FTP
Switches increase the number of collision domains in the network.
This is an Ethernet port operating at half duplex
Source Port - Acknowledgment Number - and Window

9. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
SMTP FTP and HTTP
To prevent switching loops in networks with redundant switched paths.
All switch and bridge ports are in either the forwarding or blocking state.
Transport

10. 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
It is the sum of the costs based on bandwidth
Encapsulations PPP and authentication CHAP
Buffering - Cut-through - and Congestion avoidance
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.

11. 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?
Auto - On - and Desirable
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
It will prevent segment 1's broadcasts from getting to segment 2.

12. Which of the following are types of flow control?
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.
Buffering - Cut-through - and Congestion avoidance
HTTPS - SMTP - and TFTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

13. 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.
Buffering - Cut-through - and Congestion avoidance
802.1Q and ISL
Increased latency and Filtering of all frame errors

14. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Switches increase the number of collision domains in the network.
It is used to prevent switching loops in networks with redundant switched routes.
Device Identifiers - Capabilities list - Platform

15. 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?
Duplex mismatch
Fiber optic cable.
An additional broadcast domain will be created.
Application

16. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Auto - On - and Desirable
VTP will allow switches to share VLAN configuration information
It operates without collisions and It provides faster data transfer
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

17. 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
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.
Fiber optic cable.
A broadcast address will never be the source address of a frame
Device Identifiers - Capabilities list - Platform

18. Which of the following correctly describe the various functions and virtues of a router?
Port security
Packet switching - Packet filtering and Internetwork communication.
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
Data link

19. 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.
Data link
To prevent switching loops in networks with redundant switched paths.
VTP will allow switches to share VLAN configuration information

20. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
A broadcast address will never be the source address of a frame
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The Bridgeg ID and The bridge priority
Information about a route should never be sent back in the direction from which the original update came.

21. Which of the following can lead to the contribution of LAN traffic congestion?
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.
Certkiller B > trace
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

22. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Serial0/1 is down - line protocol is down
The system is malfunctioning.
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.
Duplex mismatch

23. 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?
Encapsulations PPP and authentication CHAP
100 meters
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Learning - Listening - and Forwarding

24. 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?
100 meters
Transport
Decrease the window size.
The interfaces must be configured for NAT.

25. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
In an improperly implemented redundant topology
TCP
The switch will forward the frame to a specific port
Path selections and Packet switching.

26. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
Decrease the window size.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Physical Layer and Datalink Layer

27. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
CertK Switch(config)# ip default-gateway 192.168.1.115
It is used to prevent switching loops in networks with redundant switched routes.
Congestion avoidance - Windowing and Buffering
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

28. 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?
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.
The network layer
VTP
Device Identifiers - Capabilities list - Platform

29. 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 hub and A repeater.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
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.

30. You need to perform some initial configuration tasks on a new Certkiller switch. What is the purpose of assigning an IP address to a switch?
Increased latency and Filtering of all frame errors
Auto - Desirable - and On
To allow remote management of the switch.
100 meters

31. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
SMTP FTP and HTTP
Source Port - Acknowledgment Number - and Window
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.

32. 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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33. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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
VTP
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.

34. 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?
Network
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
The Bridgeg ID and The bridge priority
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

35. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
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.
Device Identifiers - Capabilities list - Platform
Congestion avoidance - Windowing and Buffering

36. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Increased latency and Filtering of all frame errors
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.
Layer 4

37. Why is full-duplex Ethernet superior to its single-duplex counterpart?
All switch and bridge ports are in either the forwarding or blocking state.
It operates without collisions and It provides faster data transfer
To prevent switching loops in networks with redundant switched paths.
To allow remote management of the switch.

38. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
A hub and A repeater.
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.
Application
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

39. 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?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Application
Certkiller B > trace
Increased latency and Filtering of all frame errors

40. 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 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.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.

41. 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?
The interfaces must be configured for NAT.
The system is malfunctioning.
Show arp and Show interface
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

42. 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?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Certkiller B > trace
Configure the switch so that it has lower priority than other switches in the network
This is an Ethernet port operating at half duplex

43. 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?
A hub and A repeater.
The switch will forward the frame to a specific port
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 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.

44. 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?
The port is experiencing errors
Congestion avoidance - Windowing and Buffering
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
Duplex mismatch

45. 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
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
Switches - Bridges - and Routers
Sequence number - Window size - and Acknowledgment number

46. 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?
Switches - Bridges - and Routers
802.1Q and ISL
The port is experiencing errors
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

47. 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?
Network
Show cdp neighbor detail
Physical Layer and Datalink Layer
Duplex mismatch

48. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Packet switching - Packet filtering and Internetwork communication.
Certkiller B > trace
Encapsulations PPP and authentication CHAP
A hub and A repeater.

49. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
VTP will allow switches to share VLAN configuration information
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
802.1Q and ISL

50. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
802.1Q and ISL
Source Port - Acknowledgment Number - and Window
All switch and bridge ports are in either the forwarding or blocking state.
A cross-over cable

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