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. 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?
Encapsulations PPP and authentication CHAP
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.
Layer 3

2. 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?
The Bridgeg ID and The bridge priority
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
It is the sum of the costs based on bandwidth
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

3. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Source Port - Acknowledgment Number - and Window
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Hosts use a logical bus topology
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

4. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
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.
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

5. Which of the protocols below use TCP at the transport 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
It is used to prevent switching loops in networks with redundant switched routes.
Encapsulations PPP and authentication CHAP
SMTP - FTP - HTTP - and HTTPS

6. 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
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
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.
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 cdp neighbor detail

7. 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
Layer 4
The network layer
Port security
Packet switching - Packet filtering and Internetwork communication.

8. 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
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
It is the sum of the costs based on bandwidth
Data link
It is used to prevent switching loops in networks with redundant switched routes.

9. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
A broadcast address will never be the source address of a frame
Auto - On - and Desirable
Port security
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.

10. 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?
The interfaces must be configured for NAT.
Port security
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
The switch will forward the frame to a specific port

11. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
802.3ab and 802.3z
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 will allow switches to share VLAN configuration information
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

12. 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 will forward the frame to a specific port
Serial0/1 is down - line protocol is down
Network

13. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
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.
Auto - Desirable - and On
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
ARP and ICMP

14. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
Fiber optic cable.
An electrical pulse indicates that the collision has cleared.
This is an Ethernet port operating at half duplex

15. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
In an improperly implemented redundant topology
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
It is used to prevent switching loops in networks with redundant switched routes.
The network layer

16. Which of the following correctly describe steps in the OSI date encapsulation process?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Telnet and FTP
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.

17. Which three of the protocols below belong to the application layer? (Select three answer choices)
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
VTP
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
HTTPS - SMTP - and TFTP

18. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Serial0/1 is down - line protocol is down
An electrical pulse indicates that the collision has cleared.
802.3ab and 802.3z

19. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
To prevent switching loops in networks with redundant switched paths.
It operates without collisions and It provides faster data transfer
It is the sum of the costs based on bandwidth

20. A Certkiller switch is configured with all ports assigned to VLAN 2. In addition - all ports are configured as full-duplex FastEthernet. What is the effect of adding switch ports to a new VLAN on this switch?
STP
An additional broadcast domain will be created.
The switch will forward the frame to a specific port
Auto - Desirable - and On

21. 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?
Show cdp neighbor detail
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The sequence number in the TCP header.
Data link

22. 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?
Increased latency and Filtering of all frame errors
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
Decrease the window size.
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.

23. 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 sequence number in the TCP header.
Increased latency and Filtering of all frame errors
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
VLAN and Swtich

24. 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
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.
Duplex mismatch
It is used to prevent switching loops in networks with redundant switched routes.
In an improperly implemented redundant topology

25. 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.)
Port security
MAC Address and Bridge Priority
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
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

26. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
The interfaces must be configured for NAT.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
STP
A broadcast address will never be the source address of a frame

27. 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
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 increase the number of collision domains in the network.
The network layer

28. Which two of the following values does STP take into consideration when it elects the root bridge?
Encapsulations PPP and authentication CHAP
The network layer
The Bridgeg ID and The bridge priority
Switches increase the number of collision domains in the network.

29. 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?
It is the sum of the costs based on bandwidth
Application
Physical Layer and Datalink Layer
Congestion avoidance - Windowing and Buffering

30. 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
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.
Layer 4
The sequence number in the TCP header.

31. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
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
Data link
Sequence number - Window size - and Acknowledgment number

32. 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?
Network
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Fiber optic cable.
ARP and ICMP

33. 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?
It operates without collisions and It provides faster data transfer
In an improperly implemented redundant topology
Configure the switch so that it has lower priority than other switches in the network
The network layer

34. Which of the following correctly describe the various functions and virtues of a router?
It will prevent segment 1's broadcasts from getting to segment 2.
Path selections and Packet switching.
Packet switching - Packet filtering and Internetwork communication.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

35. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
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
It will prevent segment 1's broadcasts from getting to segment 2.

36. Which of the following are spanning tree port states?
Learning - Listening - and Forwarding
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Switches increase the number of collision domains in the network.
Layer 4

37. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
HTTPS - SMTP - and TFTP
802.1Q and ISL
The sequence number in the TCP header.

38. 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
The switch will forward the frame to a specific port
All switch and bridge ports are in either the forwarding or blocking state.
Hosts use a logical bus topology

39. CDP is running between two CK devices. What information is supplied by CDP?
Device Identifiers - Capabilities list - Platform
The system is malfunctioning.
The network layer
The switch will forward the frame to a specific port

40. Which fields are included in the TCP header?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Source Port - Acknowledgment Number - and Window
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.
Show cdp neighbor detail

41. 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 Bridgeg ID and The bridge priority
Decrease the window size.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
This is an Ethernet port operating at half duplex

42. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
802.1Q and ISL
Packet switching - Packet filtering and Internetwork communication.
802.3ab and 802.3z
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

43. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
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
Layer 4
802.3ab and 802.3z

44. 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?
Port security
Congestion avoidance - Windowing and Buffering
Sequence number - Window size - and Acknowledgment number
In an improperly implemented redundant topology

45. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Packet switching - Packet filtering and Internetwork communication.
A hub and A repeater.
Switches increase the number of collision domains in the 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

46. Which of the following are true of Ethernet technology?
Hosts use a logical bus topology
TCP
HTTPS
It operates without collisions and It provides faster data transfer

47. 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.
The port is experiencing errors
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
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.

48. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
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.
It is used to prevent switching loops in networks with redundant switched routes.
Layer 4
Data link

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

50. What are two characteristics of 'store and forward' switching?
ARP and ICMP
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Certkiller B > trace
Configure the switch so that it has a lower priority than other switches in the network.