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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. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
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.
Learning - Listening - and Forwarding
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.

2. 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?
In an improperly implemented redundant topology
Configure the switch so that it has lower priority than other switches in the network
Show cdp neighbor detail
The interfaces must be configured for NAT.

3. 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?
Learning - Listening - and Forwarding
ARP and ICMP
Sequence number - Window size - and Acknowledgment number
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.

4. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
802.1Q and ISL
Increased latency and Filtering of all frame errors
The network layer
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.

5. 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
VLAN and Swtich
Show cdp neighbor detail
Show arp and Show interface
The interfaces must be configured for NAT.

6. 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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Show cdp neighbor detail
To allow remote management of the switch.

7. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
MAC Address and Bridge Priority
Layer 4
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.
Serial0/1 is down - line protocol is down

8. What is the purpose of the spanning-tree algorithm in a switched LAN?
HTTPS
To prevent switching loops in networks with redundant switched paths.
VTP
It will prevent segment 1's broadcasts from getting to segment 2.

9. 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.
Data link
The system is malfunctioning.
Port security

10. 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?
To allow remote management of the switch.
100 meters
Increased latency and Filtering of all frame errors
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

11. 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
Switches increase the number of collision domains in the network.
In an improperly implemented redundant topology
A hub and A repeater.
Fiber optic cable.

12. Which of the following correctly describe the various functions and virtues of a router?
It is used to prevent switching loops in networks with redundant switched routes.
Packet switching - Packet filtering and Internetwork communication.
A hub and A repeater.
Congestion avoidance - Windowing and Buffering

13. 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?
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Sequence number - Window size - and Acknowledgment number
100 meters

14. 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
Learning - Listening - and Forwarding
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
VLAN and Swtich
Decrease the window size.

15. 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?
ARP and ICMP
STP
Device Identifiers - Capabilities list - Platform
To allow remote management of the switch.

16. 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?
Path selections and Packet switching.
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.
This is an Ethernet port operating at half duplex
Decrease the window size.

17. While troubleshooting a connectivity problem - the Certkiller network administrator notices that a port status LED on a Cisco Catalyst Series switch is alternating between green and amber. Which condition could this indicate?
The port is experiencing errors
A cross-over cable
SMTP - FTP - HTTP - and HTTPS
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.

18. Which three of the protocols below belong to the application layer? (Select three answer choices)
Fiber optic cable.
Configure the switch so that it has lower priority than other switches in the network
HTTPS - SMTP - and TFTP
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

19. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
ARP and ICMP
Hosts use a logical bus topology
100 meters
Information about a route should never be sent back in the direction from which the original update came.

20. 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?
Show arp and Show interface
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
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.
Increased latency and Filtering of all frame errors

21. Which protocol uses TCP port 443 at layer 4?
Network
This is an Ethernet port operating at half duplex
HTTPS
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

22. Which of the following are types of flow control?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
802.1Q and ISL
Buffering - Cut-through - and Congestion avoidance

23. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Data link
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

24. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
The sequence number in the TCP header.
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.
It will prevent segment 1's broadcasts from getting to segment 2.
Switches increase the number of collision domains in the network.

25. Why is full-duplex Ethernet superior to its single-duplex counterpart?
VTP
It operates without collisions and It provides faster data transfer
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 4

26. Which of the protocols below use TCP at the transport layer?
SMTP - FTP - HTTP - and HTTPS
Source Port - Acknowledgment Number - and Window
CertK Switch(config)# ip default-gateway 192.168.1.115
Auto - Desirable - and On

27. 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
Switches - Bridges - and Routers
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
It is used to prevent switching loops in networks with redundant switched routes.

28. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
802.1Q and ISL
The port is experiencing errors
Auto - On - and Desirable
The sequence number in the TCP header.

29. 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?
Buffering - Cut-through - and Congestion avoidance
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.
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.
Certkiller B > trace

30. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
Device Identifiers - Capabilities list - Platform
VTP will allow switches to share VLAN configuration information
Congestion avoidance - Windowing and Buffering

31. 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?
Serial0/1 is down - line protocol is down
Layer 3
Certkiller B > trace
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

32. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
Application
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
An electrical pulse indicates that the collision has cleared.
HTTPS - SMTP - and TFTP

33. 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
Data link
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
A broadcast address will never be the source address of a frame
Packet switching - Packet filtering and Internetwork communication.

34. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 4
Configure the switch so that it has a lower priority than other switches in the network.
Show cdp neighbor detail
Decrease the window size.

35. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Decrease the window size.
The switch will forward the frame to a specific port
Layer 4

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.
Packet switching - Packet filtering and Internetwork communication.
Network
Data link

37. What is the IEEE standard associated with Gigabit Ethernet?
The sequence number in the TCP header.
Congestion avoidance - Windowing and Buffering
Configure the switch so that it has lower priority than other switches in the network
802.3ab and 802.3z

38. 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?
Network
Transport
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
802.1Q and ISL

39. 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.
Switches increase the number of collision domains in the network.
STP
The Bridgeg ID and The bridge priority

40. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
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
Data link
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
802.1Q and ISL

41. 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
The system is malfunctioning.
Telnet and FTP
Data link
The interfaces must be configured for NAT.

42. 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
STP
Sequence number - Window size - and Acknowledgment number
This is an Ethernet port operating at half duplex

43. 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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44. 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?
The system is malfunctioning.
A broadcast address will never be the source address of a frame
Increased latency and Filtering of all frame errors
An electrical pulse indicates that the collision has cleared.

45. 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
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
An additional broadcast domain will be created.

46. 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?
VTP
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.
ARP and ICMP
Show cdp neighbor detail

47. 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?
VTP
This is an Ethernet port operating at half duplex
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.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

48. 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
Application
Network
The interfaces must be configured for NAT.

49. 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?
Port security
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Layer 4
CertK Switch(config)# ip default-gateway 192.168.1.115

50. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
Application
Congestion avoidance - Windowing and Buffering
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
The sequence number in the TCP header.

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