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. 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.
Data link
The network layer
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

2. 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?
Layer 3
This is an Ethernet port operating at half duplex
Layer 4
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

3. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
All switch and bridge ports are in either the forwarding or blocking state.
Serial0/1 is down - line protocol is down
The port is experiencing errors
Learning - Listening - and Forwarding

4. 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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
The network layer
HTTPS - SMTP - and TFTP

5. What is the IEEE standard associated with Gigabit Ethernet?
Switches - Bridges - and Routers
802.3ab and 802.3z
A broadcast address will never be the source address of a frame
VTP will allow switches to share VLAN configuration information

6. 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
In an improperly implemented redundant topology
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.
Increased latency and Filtering of all frame errors

7. Why is full-duplex Ethernet superior to its single-duplex counterpart?
HTTPS - SMTP - and TFTP
It operates without collisions and It provides faster data transfer
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
100 meters

8. Which OSI layer header contains the address of a destination host that is on another network?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Network
It is used to prevent switching loops in networks with redundant switched routes.
This is an Ethernet port operating at half duplex

9. Which two of the following values does STP take into consideration when it elects the root bridge?
It operates without collisions and It provides faster data transfer
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
The Bridgeg ID and The bridge priority
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

10. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
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.
Layer 3
VLAN and Swtich

11. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
The switch will forward the frame to a specific port
Information about a route should never be sent back in the direction from which the original update came.
To allow remote management of the switch.
Layer 4

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
CertK Switch(config)# ip default-gateway 192.168.1.115
Path selections and Packet switching.
Telnet and FTP

13. Which of the following correctly describe steps in the OSI date encapsulation process?
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 Bridgeg ID and The bridge priority
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Information about a route should never be sent back in the direction from which the original update came.

14. 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
Application
An additional broadcast domain will be created.
Data link
Application

15. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
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.
MAC Address and Bridge Priority
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

16. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
The system is malfunctioning.
Device Identifiers - Capabilities list - Platform
Layer 4
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

17. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
The port is experiencing errors
Path selections and Packet switching.
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
Source Port - Acknowledgment Number - and Window

18. 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?
Encapsulations PPP and authentication CHAP
The interfaces must be configured for NAT.
The network layer
SMTP FTP and HTTP

19. 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
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.
VLAN and Swtich
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.
SMTP FTP and HTTP

20. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
Physical Layer and Datalink Layer
100 meters
A broadcast address will never be the source address of a frame
All switch and bridge ports are in either the forwarding or blocking state.

21. The LAN needs are expanding at the CK corporate office - which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the CK network. Which of the following are layer 1 devices that you can use?
A hub and A repeater.
Source Port - Acknowledgment Number - and Window
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.
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.

22. 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?
In an improperly implemented redundant topology
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.
Auto - Desirable - and On
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

23. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
TCP
VTP will allow switches to share VLAN configuration information
Fiber optic cable.
HTTPS - SMTP - and TFTP

24. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Switches increase the number of collision domains in the network.
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.
100 meters
An additional broadcast domain will be created.

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.)
MAC Address and Bridge Priority
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
HTTPS
A broadcast address will never be the source address of a frame

26. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
To allow remote management of the switch.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Congestion avoidance - Windowing and Buffering
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

27. Which protocol uses TCP port 443 at layer 4?
It will prevent segment 1's broadcasts from getting to segment 2.
HTTPS
Encapsulations PPP and authentication CHAP
The port is experiencing errors

28. While troubleshooting an issue in the Certkiller LAN you notice that a network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement - What is known about the network interface port?
Learning - Listening - and Forwarding
Duplex mismatch
This is an Ethernet port operating at half duplex
VLAN and Swtich

29. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Certkiller B > trace
Fiber optic cable.
A cross-over cable
Duplex mismatch

30. 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?
Path selections and Packet switching.
Configure the switch so that it has a lower priority than other switches in the network.
In an improperly implemented redundant topology
It is used to prevent switching loops in networks with redundant switched routes.

31. 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
Duplex mismatch
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The port is experiencing errors
Sequence number - Window size - and Acknowledgment number

32. 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
The port is experiencing errors
Data link
The network layer
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

33. 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.
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.
SMTP FTP and HTTP
Packet switching - Packet filtering and Internetwork communication.

34. 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.
To prevent switching loops in networks with redundant switched paths.
Path selections and Packet switching.
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.

35. 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?
Telnet and FTP
Fiber optic cable.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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. 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?
Telnet and FTP
The switch will forward the frame to a specific port
MAC Address and Bridge Priority
The port is experiencing errors

37. 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?
It operates without collisions and It provides faster data transfer
To prevent switching loops in networks with redundant switched paths.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Switches increase the number of collision domains in the network.

38. 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
All switch and bridge ports are in either the forwarding or blocking state.
Certkiller B > trace
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.
Show arp and Show interface

39. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Auto - On - and Desirable
Physical Layer and Datalink Layer
The system is malfunctioning.
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.

40. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
Switches - Bridges - and Routers
An electrical pulse indicates that the collision has cleared.
Data link
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.

41. 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
Switches increase the number of collision domains in the network.
The network layer
An additional broadcast domain will be created.

42. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
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.
Application
Transport
Configure the switch so that it has lower priority than other switches in the network

43. 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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Certkiller B > trace

44. 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)
Hosts use a logical bus topology
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Data link
The sequence number in the TCP header.

45. Which three of the protocols below belong to the application layer? (Select three answer choices)
Network
HTTPS - SMTP - and TFTP
Application
Configure the switch so that it has lower priority than other switches in the network

46. By default - which of the following factors determines the spanning-tree path cost?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Sequence number - Window size - and Acknowledgment number
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.

47. 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?
Certkiller B > trace
Physical Layer and Datalink Layer
The network layer
VTP

48. Which of the following services use TCP?
Buffering - Cut-through - and Congestion avoidance
SMTP FTP and HTTP
An additional broadcast domain will be created.
Information about a route should never be sent back in the direction from which the original update came.

49. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Information about a route should never be sent back in the direction from which the original update came.
To allow remote management of the switch.
Layer 4
Port security

50. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
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.
VTP will allow switches to share VLAN configuration information
Packet switching - Packet filtering and Internetwork communication.