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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. 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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Fiber optic cable.
Network
100 meters

2. Why is full-duplex Ethernet superior to its single-duplex counterpart?
The system is malfunctioning.
Configure the switch so that it has a lower priority than other switches in the network.
It operates without collisions and It provides faster data transfer
The sequence number in the TCP header.

3. 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?
CertK Switch(config)# ip default-gateway 192.168.1.115
Auto - On - and Desirable
100 meters
The interfaces must be configured for NAT.

4. Which of the protocols below use TCP at the transport layer?
SMTP - FTP - HTTP - and HTTPS
Layer 4
A cross-over cable
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

5. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
The interfaces must be configured for NAT.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
A broadcast address will never be the source address of a frame
It is the sum of the costs based on bandwidth

6. 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?
Device Identifiers - Capabilities list - Platform
Switches increase the number of collision domains in the network.
Decrease the window size.
The network layer

7. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
Configure the switch so that it has lower priority than other switches in the network
HTTPS - SMTP - and TFTP
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

8. 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
Fiber optic cable.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Show arp and Show interface
HTTPS - SMTP - and TFTP

9. 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?
Data link
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Buffering - Cut-through - and Congestion avoidance
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

10. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
HTTPS
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.
Configure the switch so that it has a lower priority than other switches in the network.

11. Which of the following correctly describe steps in the OSI date encapsulation process?
Switches increase the number of collision domains in the 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.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Encapsulations PPP and authentication CHAP

12. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Certkiller B > trace
Auto - Desirable - and On
CertK Switch(config)# ip default-gateway 192.168.1.115
Sequence number - Window size - and Acknowledgment number

13. 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?
HTTPS
MAC Address and Bridge Priority
Source Port - Acknowledgment Number - and Window
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

14. 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?
Application
It will prevent segment 1's broadcasts from getting to segment 2.
The Bridgeg ID and The bridge priority
VLAN and Swtich

15. 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
Data link
Layer 4
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
802.3ab and 802.3z

16. 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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17. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
ARP and ICMP
Hosts use a logical bus topology
Encapsulations PPP and authentication CHAP
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.

18. 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?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Congestion avoidance - Windowing and Buffering
Certkiller B > trace
Layer 3

19. 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?
Congestion avoidance - Windowing and Buffering
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
Certkiller B > trace

20. 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
SMTP - FTP - HTTP - and HTTPS
Duplex mismatch
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.
ARP and ICMP

21. 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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Switches - Bridges - and Routers
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.

22. Which of the following are true of Ethernet technology?
Hosts use a logical bus topology
Auto - Desirable - and On
Layer 4
An electrical pulse indicates that the collision has cleared.

23. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
STP
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.
Switches increase the number of collision domains in the network.
To allow remote management of the switch.

24. 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
All switch and bridge ports are in either the forwarding or blocking state.
Buffering - Cut-through - and Congestion avoidance
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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

25. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
It will prevent segment 1's broadcasts from getting to segment 2.
Layer 3
Learning - Listening - and Forwarding

26. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
Layer 4
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.
Information about a route should never be sent back in the direction from which the original update came.
An electrical pulse indicates that the collision has cleared.

27. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4
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.
Switches - Bridges - and Routers

28. 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.)
MAC Address and Bridge Priority
Duplex mismatch
VLAN and Swtich
Show arp and Show interface

29. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Transport
The system is malfunctioning.
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.
CertK Switch(config)# ip default-gateway 192.168.1.115

30. 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?
Data link
Decrease the window size.
This is an Ethernet port operating at half duplex
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

31. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
Network
To prevent switching loops in networks with redundant switched paths.
The system is malfunctioning.
It operates without collisions and It provides faster data transfer

32. 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
Fiber optic cable.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Duplex mismatch
A cross-over cable

33. 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?
The Bridgeg ID and The bridge priority
Telnet and FTP
A broadcast address will never be the source address of a frame
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

34. Which three of the protocols below belong to the application layer? (Select three answer choices)
This is an Ethernet port operating at half duplex
Layer 4
Configure the switch so that it has a lower priority than other switches in the network.
HTTPS - SMTP - and TFTP

35. 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
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Congestion avoidance - Windowing and Buffering

36. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Learning - Listening - and Forwarding
Data link
802.1Q and ISL
Fiber optic cable.

37. 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?
Switches - Bridges - and Routers
The sequence number in the TCP header.
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.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

38. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Layer 4
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Path selections and Packet switching.
Duplex mismatch

39. Which of the following are spanning tree port states?
VTP will allow switches to share VLAN configuration information
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.
Auto - On - and Desirable
Learning - Listening - and Forwarding

40. 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 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.
VTP will allow switches to share VLAN configuration information
It will prevent segment 1's broadcasts from getting to segment 2.
Increased latency and Filtering of all frame errors

41. 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 network layer
Congestion avoidance - Windowing and Buffering
The network layer

42. 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?
Transport
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Show cdp neighbor detail
An electrical pulse indicates that the collision has cleared.

43. 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
Switches increase the number of collision domains in the network.
Fiber optic cable.
Transport

44. 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?
Packet switching - Packet filtering and Internetwork communication.
100 meters
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Encapsulations PPP and authentication CHAP

45. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The interfaces must be configured for NAT.
In an improperly implemented redundant topology
Information about a route should never be sent back in the direction from which the original update came.

46. What is the IEEE standard associated with Gigabit Ethernet?
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
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.
802.3ab and 802.3z
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.

47. 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?
Physical Layer and Datalink Layer
Configure the switch so that it has a lower priority than other switches in the network.
Encapsulations PPP and authentication CHAP
Transport

48. 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?
HTTPS - SMTP - and TFTP
Duplex mismatch
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
To allow remote management of the switch.

49. 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?
100 meters
Serial0/1 is down - line protocol is down
Port security
The Bridgeg ID and The bridge priority

50. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
SMTP FTP and HTTP
Show arp and Show interface
Layer 4
Congestion avoidance - Windowing and Buffering

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