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CCNA Hard

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 OSI layer header contains the address of a destination host that is on another network?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
It is the sum of the costs based on bandwidth
Network
Application

2. 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?
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
100 meters
Switches increase the number of collision domains in the network.
A cross-over cable

3. Why is full-duplex Ethernet superior to its single-duplex counterpart?
It operates without collisions and It provides faster data transfer
Network
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
Auto - On - and Desirable

4. Which of the following can lead to the contribution of LAN traffic congestion?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Auto - On - and Desirable
Fiber optic cable.
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

5. Which of the following services use TCP?
The network layer
The sequence number in the TCP header.
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
SMTP FTP and HTTP

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?
Transport
Increased latency and Filtering of all frame errors
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Application

7. 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?
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
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.
A cross-over cable
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.

8. 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)
It will prevent segment 1's broadcasts from getting to segment 2.
Switches increase the number of collision domains in the network.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The switch will forward the frame to a specific port

9. 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?
The sequence number in the TCP header.
Port security
It operates without collisions and It provides faster data transfer
The network layer

10. 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
The network layer
It is used to prevent switching loops in networks with redundant switched routes.
Data link

11. ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
HTTPS
Sequence number - Window size - and Acknowledgment number
VTP

12. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
HTTPS - SMTP - and TFTP
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
ARP and ICMP
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

13. 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
To prevent switching loops in networks with redundant switched paths.
Fiber optic cable.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
802.3ab and 802.3z

14. 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?
Increased latency and Filtering of all frame errors
100 meters
Auto - Desirable - and On
CertK Switch(config)# ip default-gateway 192.168.1.115

15. Which fields are included in the TCP header?
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
A cross-over cable
Source Port - Acknowledgment Number - and Window
SMTP FTP and HTTP

16. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
In an improperly implemented redundant topology
Transport
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
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.

17. 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 sequence number in the TCP header.
Layer 4
Sequence number - Window size - and Acknowledgment number
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

18. 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
STP
Switches - Bridges - and Routers
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

19. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
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.
Duplex mismatch
Port security
Information about a route should never be sent back in the direction from which the original update came.

20. 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?
100 meters
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.
Encapsulations PPP and authentication CHAP
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

21. 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.
Learning - Listening - and Forwarding
Decrease the window size.

22. 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?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Data link
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
Congestion avoidance - Windowing and Buffering

23. 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?
Certkiller B > trace
Auto - Desirable - and On
The switch will forward the frame to a specific port
VTP

24. 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?
The port is experiencing errors
802.1Q and ISL
This is an Ethernet port operating at half duplex
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

25. 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
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
Network
A hub and A repeater.

26. 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.
TCP
Network
It operates without collisions and It provides faster data transfer

27. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
In an improperly implemented redundant topology
Physical Layer and Datalink Layer
Application
The system is malfunctioning.

28. What is the IEEE standard associated with Gigabit Ethernet?
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.
802.3ab and 802.3z
CertK Switch(config)# ip default-gateway 192.168.1.115
A hub and A repeater.

29. 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
The network layer
This is an Ethernet port operating at half duplex
In an improperly implemented redundant topology
TCP

30. 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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31. Which three statements are true about the operation of a full-duplex Ethernet network - which is being used in the Certkiller LAN?
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Serial0/1 is down - line protocol is down
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 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. What kind of cable should be used to establish a trunked line between two Catalyst switches?
A cross-over cable
The system is malfunctioning.
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
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.

33. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Encapsulations PPP and authentication CHAP
STP
It will prevent segment 1's broadcasts from getting to segment 2.
802.3ab and 802.3z

34. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
All switch and bridge ports are in either the forwarding or blocking state.
Layer 4
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.
Path selections and Packet switching.

35. 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?
Port security
Physical Layer and Datalink Layer
A hub and A repeater.
Layer 3

36. 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?
An electrical pulse indicates that the collision has cleared.
The network layer
Switches increase the number of collision domains in the network.
Serial0/1 is down - line protocol is down

37. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
Application
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
A broadcast address will never be the source address of a frame
ARP and ICMP

38. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
CertK Switch(config)# ip default-gateway 192.168.1.115
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
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

39. 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?
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.
Port security
ARP and ICMP
100 meters

40. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
Fiber optic cable.
100 meters
VTP will allow switches to share VLAN configuration information
VLAN and Swtich

41. 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?
Configure the switch so that it has lower priority than other switches in the network
Physical Layer and Datalink Layer
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
Information about a route should never be sent back in the direction from which the original update came.

42. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
Transport
It is the sum of the costs based on bandwidth
In an improperly implemented redundant topology
This is an Ethernet port operating at half duplex

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?
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.
Encapsulations PPP and authentication CHAP
Layer 4
The interfaces must be configured for NAT.

44. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
100 meters
Decrease the window size.
The Bridgeg ID and The bridge priority
Path selections and Packet switching.

45. 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
A broadcast address will never be the source address of a frame
Device Identifiers - Capabilities list - Platform
To prevent switching loops in networks with redundant switched paths.

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?
Show cdp neighbor detail
Layer 4
STP
Packet switching - Packet filtering and Internetwork communication.

47. 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?
Transport
802.1Q and ISL
Layer 3
Configure the switch so that it has lower priority than other switches in the network

48. 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?
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.
Physical Layer and Datalink Layer
The switch will forward the frame to a specific port
An electrical pulse indicates that the collision has cleared.

49. Which of the following devices can the Certkiller network administrator use to segment the LAN?
VTP
Show arp and Show interface
Switches - Bridges - and Routers
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

50. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Auto - Desirable - and On
To allow remote management of the switch.
SMTP - FTP - HTTP - and HTTPS
Layer 4