Test your basic knowledge |

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. 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
It will prevent segment 1's broadcasts from getting to segment 2.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

2. 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
Sequence number - Window size - and Acknowledgment number
The sequence number in the TCP header.
CertK Switch(config)# ip default-gateway 192.168.1.115
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

3. 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?
Duplex mismatch
TCP
The switch will forward the frame to a specific port
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

4. 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 receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Show cdp neighbor detail
ARP and ICMP
Buffering - Cut-through - and Congestion avoidance

5. 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
Auto - Desirable - and On
Source Port - Acknowledgment Number - and Window
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.

6. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Show cdp neighbor detail
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.
Show arp and Show interface
Switches increase the number of collision domains in the network.

7. 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.
It operates without collisions and It provides faster data transfer
The interfaces must be configured for NAT.
Application
Auto - Desirable - and On

8. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
MAC Address and Bridge Priority
Layer 4
The port is experiencing errors
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

9. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
Show arp and Show interface
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.
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.
The system is malfunctioning.

10. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
Transport
Application
VTP will allow switches to share VLAN configuration information

11. 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?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Application
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Network

12. 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?
Port security
A hub and A repeater.
The network layer
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

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?
Path selections and Packet switching.
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
Layer 4

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?
Certkiller B > trace
To allow remote management of the switch.
VTP will allow switches to share VLAN configuration information
ARP and ICMP

15. 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?
Source Port - Acknowledgment Number - and Window
VLAN and Swtich
The network layer
Increased latency and Filtering of all frame errors

16. Certkiller is installing IP phones in a new office. The phones and office computers connect to the same device. To ensure maximum throughout for the phone data sessions - the company needs to make sure that the phone traffic is on a different network
VLAN and Swtich
Data link
This is an Ethernet port operating at half duplex
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

17. Which three of the protocols below belong to the application layer? (Select three answer choices)
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
HTTPS - SMTP - and TFTP
Device Identifiers - Capabilities list - Platform

18. 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 port is experiencing errors
ARP and ICMP
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
To prevent switching loops in networks with redundant switched paths.

19. Which of the following can lead to the contribution of LAN traffic congestion?
Auto - On - and Desirable
Telnet and FTP
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
A cross-over cable

20. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Encapsulations PPP and authentication CHAP
All switch and bridge ports are in either the forwarding or blocking state.
Switches increase the number of collision domains in the network.
802.3ab and 802.3z

21. 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?
Telnet and FTP
It operates without collisions and It provides faster data transfer
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
The network layer

22. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Application
Path selections and Packet switching.
The port is experiencing errors
802.1Q and ISL

23. 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?
A broadcast address will never be the source address of a frame
An electrical pulse indicates that the collision has cleared.
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
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

24. 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
Auto - On - and Desirable
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 network layer
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

25. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
The network layer
Switches - Bridges - and Routers
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

26. 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?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Duplex mismatch
Fiber optic cable.
VTP

27. 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?
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
Congestion avoidance - Windowing and Buffering
Telnet and FTP
Certkiller B > trace

28. In a switched LAN network - What is the Spanning-Tree algorithm used for?
SMTP - FTP - HTTP - and HTTPS
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 is used to prevent switching loops in networks with redundant switched routes.
VTP

29. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
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.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
TCP
Information about a route should never be sent back in the direction from which the original update came.

30. 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?
CertK Switch(config)# ip default-gateway 192.168.1.115
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The switch will forward the frame to a specific port
Sequence number - Window size - and Acknowledgment number

31. 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?
Duplex mismatch
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
Port security
Certkiller B > trace

32. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
To allow remote management of the switch.
Sequence number - Window size - and Acknowledgment number
Application

33. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
802.3ab and 802.3z
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Encapsulations PPP and authentication CHAP

34. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
HTTPS - SMTP - and TFTP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Layer 3

35. 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?
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.
Physical Layer and Datalink Layer
Source Port - Acknowledgment Number - and Window
Certkiller B > trace

36. 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 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.
Packet switching - Packet filtering and Internetwork communication.
Application
Telnet and FTP

37. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
It operates without collisions and It provides faster data transfer
The port is experiencing errors
A broadcast address will never be the source address of a frame
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.

38. Which of the following are true of Ethernet technology?
Switches increase the number of collision domains in the network.
Sequence number - Window size - and Acknowledgment number
Hosts use a logical bus topology
SMTP FTP and HTTP

39. 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?
Path selections and Packet switching.
VLAN and Swtich
An electrical pulse indicates that the collision has cleared.
Layer 3

40. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 4
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
802.1Q and ISL
HTTPS - SMTP - and TFTP

41. 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
A broadcast address will never be the source address of a frame
Port security
The network layer
Duplex mismatch

42. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Telnet and FTP
Show arp and Show interface
802.1Q and ISL
Duplex mismatch

43. Which fields are included in the TCP header?
An additional broadcast domain will be created.
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.
Source Port - Acknowledgment Number - and Window
Physical Layer and Datalink Layer

44. 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.)
Packet switching - Packet filtering and Internetwork communication.
Buffering - Cut-through - and Congestion avoidance
Network
MAC Address and Bridge Priority

45. CDP is running between two CK devices. What information is supplied by CDP?
Device Identifiers - Capabilities list - Platform
It operates without collisions and It provides faster data transfer
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 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.

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

47. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Device Identifiers - Capabilities list - Platform
In an improperly implemented redundant topology
HTTPS - SMTP - and TFTP

48. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
It is the sum of the costs based on bandwidth
TCP
Auto - On - and Desirable
Configure the switch so that it has lower priority than other switches in the network

49. 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.
Buffering - Cut-through - and Congestion avoidance
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Application

50. 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
Packet switching - Packet filtering and Internetwork communication.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Show arp and Show interface
HTTPS