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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. 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?
Congestion avoidance - Windowing and Buffering
Data link
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Hosts use a logical bus topology

2. 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?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
STP
Show cdp neighbor detail
The system is malfunctioning.

3. 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?
The sequence number in the TCP header.
Configure the switch so that it has a lower priority than other switches in the network.
Application
Certkiller B > trace

4. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Buffering - Cut-through - and Congestion avoidance
This is an Ethernet port operating at half duplex
802.3ab and 802.3z
A cross-over cable

5. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
VTP will allow switches to share VLAN configuration information
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

6. 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?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Learning - Listening - and Forwarding
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.

7. 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
VTP will allow switches to share VLAN configuration information
The sequence number in the TCP header.
The network layer
TCP

8. Which of the following correctly describe steps in the OSI date encapsulation process?
Switches - Bridges - and Routers
Configure the switch so that it has lower priority than other switches in the network
Switches increase the number of collision domains in the network.
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.

9. Which of the following can lead to the contribution of LAN traffic congestion?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
A cross-over cable
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

10. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
STP
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Packet switching - Packet filtering and Internetwork communication.

11. Which OSI layer header contains the address of a destination host that is on another network?
The system is malfunctioning.
Sequence number - Window size - and Acknowledgment number
HTTPS
Network

12. 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?
Layer 3
An electrical pulse indicates that the collision has cleared.
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
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.

13. 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?
An additional broadcast domain will be created.
An electrical pulse indicates that the collision has cleared.
The port is experiencing errors
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

14. In a switched LAN network - What is the Spanning-Tree algorithm used for?
The interfaces must be configured for NAT.
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
VLAN and Swtich
It is used to prevent switching loops in networks with redundant switched routes.

15. 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?
It is used to prevent switching loops in networks with redundant switched routes.
STP
Sequence number - Window size - and Acknowledgment number
Data link

16. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
It will prevent segment 1's broadcasts from getting to segment 2.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Layer 4
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

17. 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 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.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VTP will allow switches to share VLAN configuration information
An electrical pulse indicates that the collision has cleared.

18. 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?
The sequence number in the TCP header.
Sequence number - Window size - and Acknowledgment number
Fiber optic cable.
Configure the switch so that it has a lower priority than other switches in the network.

19. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Encapsulations PPP and authentication CHAP
Telnet and FTP
It is the sum of the costs based on bandwidth

20. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
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
Auto - Desirable - and On
Auto - On - and Desirable

21. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
100 meters
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
MAC Address and Bridge Priority
Layer 4

22. 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?
The interfaces must be configured for NAT.
Network
Transport
To allow remote management of the switch.

23. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Layer 4
802.1Q and ISL
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

24. 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?
SMTP FTP and HTTP
To prevent switching loops in networks with redundant switched paths.
Decrease the window size.
Increased latency and Filtering of all frame errors

25. Which of the following are types of flow control?
Application
A hub and A repeater.
Buffering - Cut-through - and Congestion avoidance
Auto - On - and Desirable

26. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Learning - Listening - and Forwarding
Switches increase the number of collision domains in the network.
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.
A cross-over cable

27. 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?
The sequence number in the TCP header.
Layer 3
This is an Ethernet port operating at half duplex
A broadcast address will never be the source address of a frame

28. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
Hosts use a logical bus topology
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
All switch and bridge ports are in either the forwarding or blocking state.
The sequence number in the TCP header.

29. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
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.
All switch and bridge ports are in either the forwarding or blocking state.
STP
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.

30. 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?
The network layer
To prevent switching loops in networks with redundant switched paths.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

31. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Layer 4
Information about a route should never be sent back in the direction from which the original update came.
VTP will allow switches to share VLAN configuration information

32. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
Telnet and FTP
The network layer
Path selections and Packet switching.
VTP will allow switches to share VLAN configuration information

33. When you compare the differences between half-duplex and full-duplex Ethernet - which of the following characteristics are exclusive to half-duplex?
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
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

34. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
SMTP - FTP - HTTP - and HTTPS
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
TCP
Switches increase the number of collision domains in the network.

35. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
The network layer
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.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.

36. 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?
In an improperly implemented redundant topology
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.
CertK Switch(config)# ip default-gateway 192.168.1.115
Layer 3

37. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
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.
In an improperly implemented redundant topology
The interfaces must be configured for NAT.
Information about a route should never be sent back in the direction from which the original update came.

38. 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?
HTTPS - SMTP - and TFTP
It is used to prevent switching loops in networks with redundant switched routes.
Auto - On - and Desirable
Port security

39. 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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40. Which protocol uses TCP port 443 at layer 4?
Duplex mismatch
Packet switching - Packet filtering and Internetwork communication.
HTTPS
MAC Address and Bridge Priority

41. Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?
Serial0/1 is down - line protocol is down
Encapsulations PPP and authentication CHAP
HTTPS
Switches - Bridges - and Routers

42. 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
Show arp and Show interface
ARP and ICMP
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Encapsulations PPP and authentication CHAP

43. 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?
Path selections and Packet switching.
VLAN and Swtich
This is an Ethernet port operating at 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.

44. What is the IEEE standard associated with Gigabit Ethernet?
Layer 3
Transport
802.3ab and 802.3z
Port security

45. Which three of the protocols below belong to the application layer? (Select three answer choices)
HTTPS
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.
STP

46. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
STP
Show arp and Show interface
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Network

47. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Network
Show arp and Show interface
Switches - Bridges - and Routers
Switches increase the number of collision domains in the network.

48. 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 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.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
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.
Data link

49. 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?
100 meters
TCP
To allow remote management of the switch.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

50. 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?
Decrease the window size.
Certkiller B > trace
The sequence number in the TCP header.
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.

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