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CCNA Hard

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
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.
100 meters
Data link
Buffering - Cut-through - and Congestion avoidance

2. 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
Data link
Device Identifiers - Capabilities list - Platform
Show arp and Show interface
SMTP - FTP - HTTP - and HTTPS

3. 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?
It operates without collisions and It provides faster data transfer
Learning - Listening - and Forwarding
An additional broadcast domain will be created.
The Bridgeg ID and The bridge priority

4. 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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
The switch will forward the frame to a specific port
VTP
Decrease the window size.

5. 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
An additional broadcast domain will be created.
Learning - Listening - and Forwarding
Data link

6. Which two of the following values does STP take into consideration when it elects the root bridge?
Decrease the window size.
The Bridgeg ID and The bridge priority
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
It is used to prevent switching loops in networks with redundant switched routes.

7. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The switch will forward the frame to a specific port
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.
SMTP FTP and HTTP
The system is malfunctioning.

8. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Port security
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
It operates without collisions and It provides faster data transfer
A hub and A repeater.

9. Which of the following services use TCP?
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.
SMTP FTP and HTTP
VLAN and Swtich
CertK Switch(config)# ip default-gateway 192.168.1.115

10. Which of the following are types of flow control?
Buffering - Cut-through - and Congestion avoidance
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.
Learning - Listening - and Forwarding
It is used to prevent switching loops in networks with redundant switched routes.

11. By default - which of the following factors determines the spanning-tree path cost?
The port is experiencing errors
Physical Layer and Datalink Layer
It is the sum of the costs based on bandwidth
Data link

12. In a switched LAN network - What is the Spanning-Tree algorithm used for?
It will prevent segment 1's broadcasts from getting to segment 2.
Application
Transport
It is used to prevent switching loops in networks with redundant switched routes.

13. 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
Switches - Bridges - and Routers
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
Transport

14. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
An additional broadcast domain will be created.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

15. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Auto - On - and Desirable
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
MAC Address and Bridge Priority
A broadcast address will never be the source address of a frame

16. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Network

17. 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?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
CertK Switch(config)# ip default-gateway 192.168.1.115
100 meters
Switches increase the number of collision domains in the network.

18. 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)
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The system is malfunctioning.
Configure the switch so that it has a lower priority than other switches in the network.
HTTPS - SMTP - and TFTP

19. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
It will prevent segment 1's broadcasts from getting to segment 2.
Serial0/1 is down - line protocol is down
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

20. What is the IEEE standard associated with Gigabit Ethernet?
Switches increase the number of collision domains in the network.
802.3ab and 802.3z
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.
Certkiller B > trace

21. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
STP
A hub and A repeater.
HTTPS
802.1Q and ISL

22. Which protocol uses TCP port 443 at layer 4?
Transport
TCP
HTTPS
Show arp and Show interface

23. Which three of the protocols below belong to the application layer? (Select three answer choices)
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
HTTPS - SMTP - and TFTP
Telnet and FTP
A broadcast address will never be the source address of a frame

24. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
The interfaces must be configured for NAT.
TCP
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Transport

25. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
100 meters
Configure the switch so that it has lower priority than other switches in the network
Path selections and Packet switching.

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
Packet switching - Packet filtering and Internetwork communication.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Network

27. 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
CertK Switch(config)# ip default-gateway 192.168.1.115
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Fiber optic cable.
It will prevent segment 1's broadcasts from getting to segment 2.

28. 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
Show arp and Show interface
Serial0/1 is down - line protocol is down
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

29. 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?
VLAN and Swtich
Network
Layer 3
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

30. 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?
Configure the switch so that it has lower priority than other switches in the network
A hub and A repeater.
Layer 3
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.

31. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
The sequence number in the TCP header.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The network layer
A cross-over cable

32. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
A hub and A repeater.
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.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

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

34. 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
Auto - On - and Desirable
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Buffering - Cut-through - and Congestion avoidance

35. 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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36. 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?
Configure the switch so that it has a lower priority than other switches in the network.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
An electrical pulse indicates that the collision has cleared.
Telnet and FTP

37. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
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.
Packet switching - Packet filtering and Internetwork communication.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

38. Which of the following devices can the Certkiller network administrator use to segment the LAN?
The port is experiencing errors
Switches - Bridges - and Routers
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.
MAC Address and Bridge Priority

39. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Information about a route should never be sent back in the direction from which the original update came.
Network
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Sequence number - Window size - and Acknowledgment number

40. 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?
Duplex mismatch
Encapsulations PPP and authentication CHAP
Sequence number - Window size - and Acknowledgment number
Certkiller B > trace

41. Which of the protocols below use TCP at the transport layer?
Encapsulations PPP and authentication CHAP
SMTP - FTP - HTTP - and HTTPS
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

42. 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
To allow remote management of the switch.
Hosts use a logical bus topology
The network layer
Application

43. 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
Layer 4
Certkiller B > trace

44. 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?
Switches increase the number of collision domains in the network.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
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.

45. 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?
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.
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
STP

46. 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.
A broadcast address will never be the source address of a frame
The interfaces must be configured for NAT.
STP

47. 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?
Layer 4
Configure the switch so that it has lower priority than other switches in the network
HTTPS - SMTP - and TFTP
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.

48. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Physical Layer and Datalink Layer
Hosts use a logical bus topology
Fiber optic cable.

49. 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?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
An additional broadcast domain will be created.
HTTPS
The network layer

50. 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?
Switches increase the number of collision domains in the network.
The port is experiencing errors
Telnet and FTP
Port security

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