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. What are two characteristics of 'store and forward' switching?
The Bridgeg ID and The bridge priority
Device Identifiers - Capabilities list - Platform
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Buffering - Cut-through - and Congestion avoidance

2. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
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.
VTP
802.3ab and 802.3z
The system is malfunctioning.

3. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Source Port - Acknowledgment Number - and Window
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same 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
Telnet and FTP

4. Which two of the following values does STP take into consideration when it elects the root bridge?
Switches increase the number of collision domains in the network.
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 switch will forward the frame to a specific port
The Bridgeg ID and The bridge priority

5. Which of the following services use TCP?
Application
Physical Layer and Datalink Layer
SMTP FTP and HTTP
HTTPS

6. 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 Bridgeg ID and The bridge priority
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
ARP and ICMP
STP

7. Which fields are included in the TCP header?
Duplex mismatch
Source Port - Acknowledgment Number - and Window
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 switch will forward the frame to a specific port

8. 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
In an improperly implemented redundant topology
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Buffering - Cut-through - and Congestion avoidance

9. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
It will prevent segment 1's broadcasts from getting to segment 2.
Transport
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.
All switch and bridge ports are in either the forwarding or blocking state.

10. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
The interfaces must be configured for NAT.
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.
STP

11. Which of the following are types of flow control?
A hub and A repeater.
STP
Buffering - Cut-through - and Congestion avoidance
An electrical pulse indicates that the collision has cleared.

12. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
It is used to prevent switching loops in networks with redundant switched routes.
Application
Serial0/1 is down - line protocol is down
HTTPS

13. 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
Auto - On - and Desirable
Device Identifiers - Capabilities list - Platform
The sequence number in the TCP header.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

14. 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?
ARP and ICMP
VTP will allow switches to share VLAN configuration information
Configure the switch so that it has lower priority than other switches in the network
802.1Q and ISL

15. 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
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
Path selections and Packet switching.
Configure the switch so that it has lower priority than other switches in the network

16. 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
Show arp and Show interface
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Learning - Listening - and Forwarding

17. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Serial0/1 is down - line protocol is down
Switches - Bridges - and Routers
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Switches increase the number of collision domains in the network.

18. What is the purpose of the spanning-tree algorithm in a switched LAN?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
It operates without collisions and It provides faster data transfer
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.

19. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
The system is malfunctioning.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Information about a route should never be sent back in the direction from which the original update came.
All switch and bridge ports are in either the forwarding or blocking state.

20. 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?
Increased latency and Filtering of all frame errors
Source Port - Acknowledgment Number - and Window
A cross-over cable
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

21. What kind of cable should be used to establish a trunked line between two Catalyst switches?
A cross-over cable
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.
In an improperly implemented redundant topology
Port security

22. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Duplex mismatch
802.3ab and 802.3z
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.
Switches increase the number of collision domains in the network.

23. 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
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
802.1Q and ISL
It will prevent segment 1's broadcasts from getting to segment 2.

24. With regard to Ethernet media access methods - which of the following are true?
An electrical pulse indicates that the collision has cleared.
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.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Layer 4

25. 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
Show cdp neighbor detail
Layer 4
Fiber optic cable.
802.1Q and ISL

26. 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
Buffering - Cut-through - and Congestion avoidance
Fiber optic cable.
Duplex mismatch

27. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Application
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.
Decrease the window size.

28. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Show arp and Show interface
In an improperly implemented redundant topology
Switches - Bridges - and Routers
Path selections and Packet switching.

29. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Information about a route should never be sent back in the direction from which the original update came.
ARP and ICMP
Layer 4
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.

30. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
802.1Q and ISL
Fiber optic cable.
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.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

31. 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.)
Network
Configure the switch so that it has lower priority than other switches in the network
100 meters
MAC Address and Bridge Priority

32. 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?
VTP
A cross-over cable
Physical Layer and Datalink Layer
A hub and A repeater.

33. What is the IEEE standard associated with Gigabit Ethernet?
Switches increase the number of collision domains in the network.
802.3ab and 802.3z
SMTP FTP and HTTP
Configure the switch so that it has a lower priority than other switches in the network.

34. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
To prevent switching loops in networks with redundant switched paths.
Telnet and FTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Device Identifiers - Capabilities list - Platform

35. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
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.
Sequence number - Window size - and Acknowledgment number
The interfaces must be configured for NAT.

36. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
STP
Encapsulations PPP and authentication CHAP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
It is used to prevent switching loops in networks with redundant switched routes.

37. 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.
Switches - Bridges - and Routers
All switch and bridge ports are in either the forwarding or blocking state.
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.

38. 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)
A hub and A repeater.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Application
Application

39. 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?
Congestion avoidance - Windowing and Buffering
Auto - On - and Desirable
TCP
Network

40. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Buffering - Cut-through - and Congestion avoidance
Switches increase the number of collision domains in the network.
It is used to prevent switching loops in networks with redundant switched routes.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

41. 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?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Duplex mismatch
Learning - Listening - and Forwarding
Physical Layer and Datalink Layer

42. 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?
To prevent switching loops in networks with redundant switched paths.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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
Device Identifiers - Capabilities list - Platform

43. 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
Packet switching - Packet filtering and Internetwork communication.
The interfaces must be configured for NAT.
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.
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.

44. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
In an improperly implemented redundant topology
Duplex mismatch
VTP will allow switches to share VLAN configuration information
The network layer

45. Which OSI layer header contains the address of a destination host that is on another 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.
Certkiller B > trace
Network
Buffering - Cut-through - and Congestion avoidance

46. 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?
Network
Information about a route should never be sent back in the direction from which the original update came.
Configure the switch so that it has lower priority than other switches in the network
The network layer

47. Why is full-duplex Ethernet superior to its single-duplex counterpart?
VLAN and Swtich
MAC Address and Bridge Priority
Telnet and FTP
It operates without collisions and It provides faster data transfer

48. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Certkiller B > trace
The interfaces must be configured for NAT.
TCP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

49. A host computer has been correctly configured with a static IP address - but the default gateway is incorrectly set. Which layer of the OSI model will be first effected by this configuration error?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Layer 3
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

50. Both the switches and hubs are being utilized within the CK network. Which of the following is true regarding the use of switches and hubs for the network connectivity in this network?
To allow remote management of the switch.
Switches - Bridges - and Routers
Switches increase the number of collision domains in the network.
802.1Q and ISL