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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. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 4
Congestion avoidance - Windowing and Buffering
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Application

2. 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
To prevent switching loops in networks with redundant switched paths.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Data link
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

3. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
SMTP - FTP - HTTP - and HTTPS
Network
100 meters
To prevent switching loops in networks with redundant switched paths.

4. 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?
TCP
CertK Switch(config)# ip default-gateway 192.168.1.115
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
Buffering - Cut-through - and Congestion avoidance

5. 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?
In an improperly implemented redundant topology
802.1Q and ISL
To allow remote management of the switch.
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

6. 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?
Data link
Certkiller B > trace
ARP and ICMP
Increased latency and Filtering of all frame errors

7. 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
A cross-over cable
HTTPS
The sequence number in the TCP header.

8. 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?
Device Identifiers - Capabilities list - Platform
A hub and A repeater.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
STP

9. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Hosts use a logical bus topology
HTTPS
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.
Auto - On - and Desirable

10. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Layer 4
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.
Serial0/1 is down - line protocol is down
Encapsulations PPP and authentication CHAP

11. 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
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.
STP
VLAN and Swtich

12. Which of the following are types of flow control?
VTP will allow switches to share VLAN configuration information
100 meters
Buffering - Cut-through - and Congestion avoidance
To prevent switching loops in networks with redundant switched paths.

13. 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?
Certkiller B > trace
VTP
SMTP FTP and HTTP
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

14. 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
The system is malfunctioning.
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 allow remote management of the switch.

15. 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 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.
The switch will forward the frame to a specific port
MAC Address and Bridge Priority
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.

16. 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?
It operates without collisions and It provides faster data transfer
802.3ab and 802.3z
Application
Auto - On - and Desirable

17. 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?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
HTTPS
MAC Address and Bridge Priority
Switches increase the number of collision domains in the network.

18. 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
An electrical pulse indicates that the collision has cleared.
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.
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

19. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
Source Port - Acknowledgment Number - and Window
Duplex mismatch
Switches increase the number of collision domains in the network.
ARP and ICMP

20. 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?
Serial0/1 is down - line protocol is down
VTP will allow switches to share VLAN configuration information
The network layer
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

21. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Serial0/1 is down - line protocol is down
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
Layer 3
Path selections and Packet switching.

22. 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?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
An electrical pulse indicates that the collision has cleared.
Layer 3

23. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Show cdp neighbor detail
A cross-over cable
SMTP FTP and HTTP
The network layer

24. What are two characteristics of 'store and forward' switching?
Serial0/1 is down - line protocol is down
Decrease the window size.
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
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

25. 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?
Packet switching - Packet filtering and Internetwork communication.
HTTPS - SMTP - and TFTP
Auto - On - and Desirable
Sequence number - Window size - and Acknowledgment number

26. 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.)
Information about a route should never be sent back in the direction from which the original update came.
MAC Address and Bridge Priority
100 meters
VLAN and Swtich

27. 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?
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.
To allow remote management of the switch.
ARP and ICMP
Buffering - Cut-through - and Congestion avoidance

28. Which of the following correctly describe the various functions and virtues of a router?
Congestion avoidance - Windowing and Buffering
An additional broadcast domain will be created.
Learning - Listening - and Forwarding
Packet switching - Packet filtering and Internetwork communication.

29. 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.
Application
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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

30. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
It operates without collisions and It provides faster data transfer
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.
The switch will forward the frame to a specific port

31. With regard to Ethernet media access methods - which of the following are true?
The system is malfunctioning.
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.
Configure the switch so that it has a lower priority than other switches in the network.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

32. 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?
Physical Layer and Datalink Layer
Switches - Bridges - and Routers
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Device Identifiers - Capabilities list - Platform

33. 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?
This is an Ethernet port operating at half duplex
Application
To prevent switching loops in networks with redundant switched paths.
100 meters

34. 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
SMTP - FTP - HTTP - and HTTPS
MAC Address and Bridge Priority
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

35. 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?
It will prevent segment 1's broadcasts from getting to segment 2.
VTP
Physical Layer and Datalink Layer
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

36. 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?
Show cdp neighbor detail
The interfaces must be configured for NAT.
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.
To prevent switching loops in networks with redundant switched paths.

37. Why is full-duplex Ethernet superior to its single-duplex counterpart?
Buffering - Cut-through - and Congestion avoidance
Show arp and Show interface
Information about a route should never be sent back in the direction from which the original update came.
It operates without collisions and It provides faster data transfer

38. 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 broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
The system is malfunctioning.
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.
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.

39. 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?
The port is experiencing errors
SMTP - FTP - HTTP - and HTTPS
The switch will forward the frame to a specific port
Congestion avoidance - Windowing and Buffering

40. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
The switch will forward the frame to a specific port
TCP
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
Data link

41. 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?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
SMTP FTP and HTTP
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.
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.

42. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
Encapsulations PPP and authentication CHAP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
It is the sum of the costs based on bandwidth

43. Which of the following are true of Ethernet technology?
It is used to prevent switching loops in networks with redundant switched routes.
To prevent switching loops in networks with redundant switched paths.
Hosts use a logical bus topology
TCP

44. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
Encapsulations PPP and authentication CHAP
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 switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Switches increase the number of collision domains in the network.

45. 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 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
An electrical pulse indicates that the collision has cleared.
It is used to prevent switching loops in networks with redundant switched routes.

46. 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.
A hub and A repeater.
SMTP FTP and HTTP
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

47. Which of the following services use TCP?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
TCP
SMTP FTP and HTTP
To allow remote management of the switch.

48. Which fields are included in the TCP header?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Configure the switch so that it has lower priority than other switches in the network
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.
Source Port - Acknowledgment Number - and Window

49. What is the purpose of the spanning-tree algorithm in a switched LAN?
To allow remote management of the switch.
To prevent switching loops in networks with redundant switched paths.
HTTPS
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

50. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
The system is malfunctioning.
An electrical pulse indicates that the collision has cleared.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
In an improperly implemented redundant topology

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