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. Why is full-duplex Ethernet superior to its single-duplex counterpart?
MAC Address and Bridge Priority
It operates without collisions and It provides faster data transfer
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

2. Which three of the protocols below belong to the application layer? (Select three answer choices)
HTTPS - SMTP - and TFTP
The interfaces must be configured for NAT.
Switches increase the number of collision domains in the network.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

3. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
A hub and A repeater.
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.
STP

4. 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
SMTP FTP and HTTP
To allow remote management of the switch.
The sequence number in the TCP header.

5. 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?
To prevent switching loops in networks with redundant switched paths.
The network layer
Configure the switch so that it has a lower priority than other switches in the network.
Application

6. 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?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same 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.
An electrical pulse indicates that the collision has cleared.
Source Port - Acknowledgment Number - and Window

7. A Certkiller Ethernet switch receives a unicast frame with a destination MAC that IS listed in the switch table. What will this switch do with the frame?
The switch will forward the frame to a specific port
The network layer
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.
Increased latency and Filtering of all frame errors

8. 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
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
MAC Address and Bridge Priority
Switches increase the number of collision domains in the network.

9. Which of the following can lead to the contribution of LAN traffic congestion?
Congestion avoidance - Windowing and Buffering
Layer 4
Show arp and Show interface
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

10. 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?
Configure the switch so that it has lower priority than other switches in the network
It is the sum of the costs based on bandwidth
Telnet and FTP
Auto - On - and Desirable

11. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
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.
Congestion avoidance - Windowing and Buffering
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
100 meters

12. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Duplex mismatch
STP
Fiber optic cable.
Show cdp neighbor detail

13. By default - which of the following factors determines the spanning-tree path cost?
ARP and ICMP
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
It is the sum of the costs based on bandwidth
The sequence number in the TCP header.

14. Which of the protocols below use TCP at the transport layer?
SMTP - FTP - HTTP - and HTTPS
Hosts use a logical bus topology
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Transport

15. 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
Switches increase the number of collision domains in the 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
SMTP FTP and HTTP

16. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
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 sequence number in the TCP header.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
TCP

17. In a switched LAN network - What is the Spanning-Tree algorithm used for?
It is used to prevent switching loops in networks with redundant switched routes.
Transport
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

18. As a Certkiller trainee you are required to set the default gateway on a Cisco switch to the IP address of 192.168.1.115. Which IOS command should you use?
VTP will allow switches to share VLAN configuration information
CertK Switch(config)# ip default-gateway 192.168.1.115
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.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

19. 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.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Telnet and FTP
It will prevent segment 1's broadcasts from getting to segment 2.

20. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
Path selections and Packet switching.
CertK Switch(config)# ip default-gateway 192.168.1.115
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

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?
Packet switching - Packet filtering and Internetwork communication.
Layer 3
Switches - Bridges - and Routers
The network layer

22. 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
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
TCP
ARP and ICMP

23. 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?
Auto - Desirable - and On
Serial0/1 is down - line protocol is down
Layer 4
Decrease the window size.

24. 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
The sequence number in the TCP header.
Learning - Listening - and Forwarding
This is an Ethernet port operating at half duplex
Path selections and Packet switching.

25. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4
ARP and ICMP
An additional broadcast domain will be created.

26. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Layer 4
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.

27. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
TCP
HTTPS - SMTP - and TFTP
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

28. 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?
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
Data link
A hub and A repeater.
Network

29. Which OSI layer header contains the address of a destination host that is on another network?
Network
Packet switching - Packet filtering and Internetwork communication.
ARP and ICMP
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

30. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Source Port - Acknowledgment Number - and Window
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Serial0/1 is down - line protocol is down
A cross-over cable

31. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Transport
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
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.
HTTPS - SMTP - and TFTP

32. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
Congestion avoidance - Windowing and Buffering
MAC Address and Bridge Priority
Duplex mismatch

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

34. Which of the following services use TCP?
Packet switching - Packet filtering and Internetwork communication.
Decrease the window size.
Show arp and Show interface
SMTP FTP and HTTP

35. Which protocol uses TCP port 443 at layer 4?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
HTTPS
It will prevent segment 1's broadcasts from getting to segment 2.
VTP will allow switches to share VLAN configuration information

36. CDP is running between two CK devices. What information is supplied by CDP?
Packet switching - Packet filtering and Internetwork communication.
Device Identifiers - Capabilities list - Platform
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 cross-over cable

37. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Duplex mismatch
Information about a route should never be sent back in the direction from which the original update came.
A hub and A repeater.
To allow remote management of the switch.

38. 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
The switch will forward the frame to a specific port
Fiber optic cable.
Path selections and Packet switching.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

39. An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location?
A hub and A repeater.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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.
A cross-over cable

40. 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?
It is the sum of the costs based on bandwidth
Serial0/1 is down - line protocol is down
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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

41. 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.
CertK Switch(config)# ip default-gateway 192.168.1.115
It is the sum of the costs based on bandwidth
Network

42. What is the purpose of the spanning-tree algorithm in a switched LAN?
Configure the switch so that it has a lower priority than other switches in the network.
To prevent switching loops in networks with redundant switched paths.
Transport
Data link

43. 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
Encapsulations PPP and authentication CHAP
Layer 4
Auto - Desirable - and On
The network layer

44. 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 port is experiencing errors
Layer 3
ARP and ICMP
The switch will forward the frame to a specific port

45. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Application
SMTP - FTP - HTTP - and HTTPS
VTP will allow switches to share VLAN configuration information

46. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
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
Transport
Layer 4

47. 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?
Increased latency and Filtering of all frame errors
Sequence number - Window size - and Acknowledgment number
Layer 3
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

48. 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?
Show cdp neighbor detail
The network layer
Serial0/1 is down - line protocol is down
VTP

49. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
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.
Data link
Increased latency and Filtering of all frame errors
Fiber optic cable.

50. 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 throughout than can half-duplex Ethernet of the same bandwidth
Layer 4
VTP will allow switches to share VLAN configuration information
VLAN and Swtich