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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 fields are included in the TCP header?
Source Port - Acknowledgment Number - and Window
A cross-over cable
This is an Ethernet port operating at half duplex
VLAN and Swtich

2. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
Device Identifiers - Capabilities list - Platform
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
VTP will allow switches to share VLAN configuration information
Auto - On - and Desirable

3. CDP is running between two CK devices. What information is supplied by CDP?
Configure the switch so that it has lower priority than other switches in the network
Device Identifiers - Capabilities list - Platform
Fiber optic cable.
Path selections and Packet switching.

4. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
100 meters
Transport
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
Certkiller B > trace

5. 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?
The switch will forward the frame to a specific port
802.1Q and ISL
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Encapsulations PPP and authentication CHAP

6. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
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.

7. CDP is being used trhoughout the CK network. What are two reasons why the CK network administrator would use CDP?
The port is experiencing errors
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.
Sequence number - Window size - and Acknowledgment number
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

8. By default - which of the following factors determines the spanning-tree path cost?
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
STP
It is the sum of the costs based on bandwidth

9. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Auto - On - and Desirable
Hosts use a logical bus topology
Transport
The sequence number in the TCP header.

10. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
An electrical pulse indicates that the collision has cleared.
Configure the switch so that it has a lower priority than other switches in the network.
Layer 4

11. 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.
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.
Source Port - Acknowledgment Number - and Window

12. Which of the following services use TCP?
SMTP FTP and HTTP
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
TCP
Layer 3

13. 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
Show arp and Show interface
Layer 3
Physical Layer and Datalink Layer

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
VLAN and Swtich
Fiber optic cable.
Physical Layer and Datalink Layer
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

15. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Physical Layer and Datalink Layer
A cross-over cable
Layer 4
It is the sum of the costs based on bandwidth

16. 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
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
In an improperly implemented redundant topology
Data link
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

17. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
802.3ab and 802.3z
SMTP FTP and HTTP
In an improperly implemented redundant topology
Fiber optic cable.

18. 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?
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
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.
Duplex mismatch

19. 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?
100 meters
Learning - Listening - and Forwarding
This is an Ethernet port operating at half duplex
STP

20. 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.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Certkiller B > trace
Switches increase the number of collision domains in the network.

21. 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?
Application
Decrease the window size.
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

22. 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 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
An additional broadcast domain will be created.
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 port is experiencing errors

23. 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?
The port is experiencing errors
Sequence number - Window size - and Acknowledgment number
Fiber optic cable.
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

24. Which of the following are spanning tree port states?
Learning - Listening - and Forwarding
To allow remote management of the switch.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
This is an Ethernet port operating at half duplex

25. 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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Application
An additional broadcast domain will be created.

26. 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
Congestion avoidance - Windowing and Buffering
Auto - On - and Desirable
The network layer
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

27. 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?
The port is experiencing errors
This is an Ethernet port operating at half duplex
Increased latency and Filtering of all frame errors
100 meters

28. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
ARP and ICMP
Path selections and Packet switching.
Device Identifiers - Capabilities list - Platform
SMTP FTP and HTTP

29. Which of the following are true of Ethernet technology?
Show cdp neighbor detail
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.
Switches increase the number of collision domains in the network.
Hosts use a logical bus topology

30. 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?
802.3ab and 802.3z
Layer 3
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
To prevent switching loops in networks with redundant switched paths.

31. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Encapsulations PPP and authentication CHAP
Layer 4
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.

32. 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.)
Application
An additional broadcast domain will be created.
CertK Switch(config)# ip default-gateway 192.168.1.115
MAC Address and Bridge Priority

33. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
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 allow remote management of the switch.
Layer 3
802.1Q and ISL

34. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Duplex mismatch
Auto - On - and Desirable

35. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Sequence number - Window size - and Acknowledgment number
It is used to prevent switching loops in networks with redundant switched routes.
Application
Switches increase the number of collision domains in the network.

36. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
To allow remote management of the switch.
Data link
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.
TCP

37. 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
Network
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.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Switches increase the number of collision domains in the network.

38. Assuming you build networks to exact specifications - What is the recommended maximum length a 10BaseT cable can be before it has to be segmented or repeated?
A broadcast address will never be the source address of a frame
100 meters
Network
Telnet and FTP

39. With regard to Ethernet media access methods - which of the following are true?
Port security
VTP will allow switches to share VLAN configuration information
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.

40. 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?
Network
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
VLAN and Swtich
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

41. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
It will prevent segment 1's broadcasts from getting to segment 2.
It operates without collisions and It provides faster data transfer
The network layer

42. 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
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
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.
Duplex mismatch

43. 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?
Increased latency and Filtering of all frame errors
VTP will allow switches to share VLAN configuration information
The interfaces must be configured for NAT.
Auto - On - and Desirable

44. What is the IEEE standard associated with Gigabit Ethernet?
802.3ab and 802.3z
Show cdp neighbor detail
The sequence number in the TCP header.
The system is malfunctioning.

45. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
To prevent switching loops in networks with redundant switched paths.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
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 operates without collisions and It provides faster data transfer

46. 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?
STP
The port is experiencing errors
Application
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.

47. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
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.
A broadcast address will never be the source address of a frame
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

48. 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?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Port security
100 meters
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.

49. 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
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Configure the switch so that it has a lower priority than other switches in the network.
Physical Layer and Datalink Layer

50. 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?
Auto - On - and Desirable
A hub and A repeater.
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.
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

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