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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. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Congestion avoidance - Windowing and Buffering
A cross-over cable
Network
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

2. 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.
Increased latency and Filtering of all frame errors
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.
Source Port - Acknowledgment Number - and Window

3. Which of the following can lead to the contribution of LAN traffic congestion?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Packet switching - Packet filtering and Internetwork communication.
Network
Configure the switch so that it has lower priority than other switches in the network

4. 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?
Auto - Desirable - and On
STP
Physical Layer and Datalink Layer
A cross-over cable

5. What kind of cable should be used to establish a trunked line between two Catalyst switches?
A cross-over cable
TCP
The network layer
CertK Switch(config)# ip default-gateway 192.168.1.115

6. Which of the following are true of Ethernet technology?
Information about a route should never be sent back in the direction from which the original update came.
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.
Packet switching - Packet filtering and Internetwork communication.
Hosts use a logical bus topology

7. What is the purpose of the spanning-tree algorithm in a switched LAN?
ARP and ICMP
To prevent switching loops in networks with redundant switched paths.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
This is an Ethernet port operating at half duplex

8. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
It is used to prevent switching loops in networks with redundant switched routes.
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

9. 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?
Data link
Certkiller B > trace
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

10. 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?
SMTP FTP and HTTP
Auto - Desirable - and On
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
ARP and ICMP

11. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Information about a route should never be sent back in the direction from which the original update came.
HTTPS
MAC Address and Bridge Priority

12. 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.
The switch will forward the frame to a specific port
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.
Switches increase the number of collision domains in the network.

13. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Device Identifiers - Capabilities list - Platform
TCP
Layer 4
Auto - Desirable - and On

14. Which of the following correctly describe steps in the OSI date encapsulation process?
HTTPS
Buffering - Cut-through - and Congestion avoidance
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 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.

15. Which fields are included in the TCP header?
Auto - On - and Desirable
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
VTP will allow switches to share VLAN configuration information
Source Port - Acknowledgment Number - and Window

16. 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
Telnet and FTP
The switch will forward the frame to a specific port
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.
Switches increase the number of collision domains in the network.

17. 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.
Device Identifiers - Capabilities list - Platform
HTTPS - SMTP - and TFTP
VLAN and Swtich

18. 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?
Layer 4
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
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.

19. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Transport
Path selections and Packet switching.
A cross-over cable
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

20. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Switches - Bridges - and Routers
This is an Ethernet port operating at half duplex
It operates without collisions and It provides faster data transfer
Port security

21. 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.
Buffering - Cut-through - and Congestion avoidance
Application
HTTPS
Encapsulations PPP and authentication CHAP

22. 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?
Show cdp neighbor detail
An electrical pulse indicates that the collision has cleared.
The network layer
Application

23. 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
SMTP - FTP - HTTP - and HTTPS
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
CertK Switch(config)# ip default-gateway 192.168.1.115

24. 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?
The network layer
Application
CertK Switch(config)# ip default-gateway 192.168.1.115
The system is malfunctioning.

25. 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
The Bridgeg ID and The bridge priority
A hub and A repeater.
The network layer

26. 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?
Increased latency and Filtering of all frame errors
Auto - On - and Desirable
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Serial0/1 is down - line protocol is down

27. By default - which of the following factors determines the spanning-tree path cost?
A broadcast address will never be the source address of a frame
It is the sum of the costs based on bandwidth
The interfaces must be configured for NAT.
Sequence number - Window size - and Acknowledgment number

28. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
Auto - Desirable - and On
STP
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.
To allow remote management of the switch.

29. 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?
802.1Q and ISL
Information about a route should never be sent back in the direction from which the original update came.
Application
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

30. 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
VTP
Hosts use a logical bus topology
Data link
Layer 3

31. 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?
VLAN and Swtich
Telnet and FTP
The system is malfunctioning.
100 meters

32. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Device Identifiers - Capabilities list - Platform
Layer 4
An electrical pulse indicates that the collision has cleared.
Data link

33. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
ARP and ICMP
Source Port - Acknowledgment Number - and Window

34. 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
Duplex mismatch
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4

35. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
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 switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VLAN and Swtich
The network layer

36. Which of the protocols below use TCP at the transport layer?
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.
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
SMTP - FTP - HTTP - and HTTPS

37. Which two of the following values does STP take into consideration when it elects the root bridge?
It is the sum of the costs based on bandwidth
The Bridgeg ID and The bridge priority
Encapsulations PPP and authentication CHAP
Configure the switch so that it has a lower priority than other switches in the network.

38. In a switched LAN network - What is the Spanning-Tree algorithm used for?
It is the sum of the costs based on bandwidth
The network layer
It is used to prevent switching loops in networks with redundant switched routes.
Sequence number - Window size - and Acknowledgment number

39. 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
VLAN and Swtich
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Sequence number - Window size - and Acknowledgment number

40. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Network
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Physical Layer and Datalink Layer
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.

41. The Certkiller corporate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change?

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42. Which of the following correctly describe the various functions and virtues of a router?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Path selections and Packet switching.
802.3ab and 802.3z
Packet switching - Packet filtering and Internetwork communication.

43. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
SMTP - FTP - HTTP - and HTTPS
Data link
Application
TCP

44. 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?
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
It will prevent segment 1's broadcasts from getting to segment 2.
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.
Layer 3

45. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
STP
It will prevent segment 1's broadcasts from getting to segment 2.
The system is malfunctioning.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

46. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
VLAN and Swtich
Layer 4
Sequence number - Window size - and Acknowledgment number
Transport

47. 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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
HTTPS
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
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

48. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
The network layer
A cross-over cable
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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

49. 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 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
Layer 3
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
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.

50. Which of the following services use TCP?
Show arp and Show interface
Certkiller B > trace
SMTP FTP and HTTP
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses