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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. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Buffering - Cut-through - and Congestion avoidance
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

2. With regard to Ethernet media access methods - which of the following are true?
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.
Data link
Transport
Physical Layer and Datalink Layer

3. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Data link
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Path selections and Packet switching.
Serial0/1 is down - line protocol is down

4. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Decrease the window size.
Layer 4
Application

5. 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 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 interfaces must be configured for NAT.
Switches increase the number of collision domains in the network.
Learning - Listening - and Forwarding

6. What is the IEEE standard associated with Gigabit Ethernet?
It will prevent segment 1's broadcasts from getting to segment 2.
802.3ab and 802.3z
Fiber optic cable.
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.

7. 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
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The network layer
802.3ab and 802.3z

8. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
Sequence number - Window size - and Acknowledgment number
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Learning - Listening - and Forwarding

9. 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?
Auto - On - and Desirable
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.
Layer 4
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

10. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
Fiber optic cable.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
All switch and bridge ports are in either the forwarding or blocking state.
It will prevent segment 1's broadcasts from getting to segment 2.

11. 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.
An electrical pulse indicates that the collision has cleared.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
TCP

12. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
The sequence number in the TCP header.
The Bridgeg ID and The bridge priority

13. Which of the following services use TCP?
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.
VTP will allow switches to share VLAN configuration information
SMTP FTP and HTTP
TCP

14. 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?
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.
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.
An additional broadcast domain will be created.
To allow remote management of the switch.

15. Which two of the following values does STP take into consideration when it elects the root bridge?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Application
The Bridgeg ID and The bridge priority
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.

16. 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?
Layer 4
Increased latency and Filtering of all frame errors
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Physical Layer and Datalink Layer

17. Which of the following correctly describe the various functions and virtues of a router?
Packet switching - Packet filtering and Internetwork communication.
This is an Ethernet port operating at half duplex
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The network layer

18. CDP is running between two CK devices. What information is supplied by CDP?
Application
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
Device Identifiers - Capabilities list - Platform
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

19. 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?
Layer 3
Increased latency and Filtering of all frame errors
The network layer
Show cdp neighbor detail

20. Which of the following are true of Ethernet technology?
Hosts use a logical bus topology
CertK Switch(config)# ip default-gateway 192.168.1.115
The port is experiencing errors
Buffering - Cut-through - and Congestion avoidance

21. The Certkiller network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?
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
Application
This is an Ethernet port operating at half duplex

22. 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
To prevent switching loops in networks with redundant switched paths.
The interfaces must be configured for NAT.
The network layer
Configure the switch so that it has lower priority than other switches in the network

23. 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.
Layer 3
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.
100 meters

24. What are two characteristics of 'store and forward' switching?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Sequence number - Window size - and Acknowledgment number
MAC Address and Bridge Priority
To allow remote management of the switch.

25. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
The system is malfunctioning.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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.

26. 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.)
In an improperly implemented redundant topology
A hub and A repeater.
Configure the switch so that it has a lower priority than other switches in the network.
MAC Address and Bridge Priority

27. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
HTTPS
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.
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.

28. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
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
Transport
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.

29. What is the purpose of the spanning-tree algorithm in a switched LAN?
Layer 4
It will prevent segment 1's broadcasts from getting to segment 2.
To prevent switching loops in networks with redundant switched paths.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

30. 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)
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
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.
Sequence number - Window size - and Acknowledgment number

31. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Layer 4
Sequence number - Window size - and Acknowledgment number
The switch will forward the frame to a specific port

32. Which fields are included in the TCP header?
Auto - On - and Desirable
Duplex mismatch
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Source Port - Acknowledgment Number - and Window

33. 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
Port security
802.1Q and ISL
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Encapsulations PPP and authentication CHAP
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.

35. Which protocol uses TCP port 443 at layer 4?
HTTPS
The interfaces must be configured for NAT.
Packet switching - Packet filtering and Internetwork communication.
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.

36. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
A broadcast address will never be the source address of a frame
Increased latency and Filtering of all frame errors
HTTPS

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?
The port is experiencing errors
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Hosts use a logical bus topology

38. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Show cdp neighbor detail
It operates without collisions and It provides faster data transfer
Network
802.1Q and ISL

39. 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
Sequence number - Window size - and Acknowledgment number
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Show arp and Show interface
The interfaces must be configured for NAT.

40. 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
SMTP FTP and HTTP
Fiber optic cable.
Auto - On - and Desirable
802.1Q and ISL

41. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Layer 4
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
802.1Q and ISL

42. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Sequence number - Window size - and Acknowledgment number
100 meters
VTP will allow switches to share VLAN configuration information

43. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Layer 4
Switches increase the number of collision domains in the network.
A cross-over cable

44. 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?
Show arp and Show interface
Physical Layer and Datalink Layer
MAC Address and Bridge Priority
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.

45. Which three of the protocols below belong to the application layer? (Select three answer choices)
HTTPS - SMTP - and TFTP
A cross-over cable
802.1Q and ISL
It will prevent segment 1's broadcasts from getting to segment 2.

46. 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?
Auto - On - and Desirable
MAC Address and Bridge Priority
Congestion avoidance - Windowing and Buffering
802.3ab and 802.3z

47. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Auto - Desirable - and On
Show cdp neighbor detail
Data link
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

48. 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
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Path selections and Packet switching.
Duplex mismatch
VLAN and Swtich

49. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
100 meters
Configure the switch so that it has lower priority than other switches in the network
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.

50. Which of the following are types of flow control?
Certkiller B > trace
Port security
Buffering - Cut-through - and Congestion avoidance
Decrease the window size.