Test your basic knowledge |

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. 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?
Path selections and Packet switching.
Transport
ARP and ICMP
802.1Q and ISL

2. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Hosts use a logical bus topology
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
STP
Configure the switch so that it has lower priority than other switches in the network

3. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
It is the sum of the costs based on bandwidth
Configure the switch so that it has a lower priority than other switches in the network.
Encapsulations PPP and authentication CHAP
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.

4. 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?
Device Identifiers - Capabilities list - Platform
It will prevent segment 1's broadcasts from getting to segment 2.
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
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

5. 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?
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
100 meters
MAC Address and Bridge Priority
Network

6. 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?
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
To prevent switching loops in networks with redundant switched paths.
VLAN and Swtich

7. Which of the following are true of Ethernet technology?
It is the sum of the costs based on bandwidth
The interfaces must be configured for NAT.
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Hosts use a logical bus topology

8. 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.
The switch will forward the frame to a specific port
To allow remote management of the switch.
HTTPS

9. Which of the following are spanning tree port states?
The Bridgeg ID and The 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.
Learning - Listening - and Forwarding
Configure the switch so that it has a lower priority than other switches in the network.

10. 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.)
Increased latency and Filtering of all frame errors
MAC Address and Bridge Priority
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.
The interfaces must be configured for NAT.

11. 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?
Telnet and FTP
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.
SMTP FTP and HTTP

12. 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?
CertK Switch(config)# ip default-gateway 192.168.1.115
Packet switching - Packet filtering and Internetwork communication.
Show cdp neighbor detail
The port is experiencing errors

13. Which of the following correctly describe the various functions and virtues of a router?
802.1Q and ISL
Device Identifiers - Capabilities list - Platform
Packet switching - Packet filtering and Internetwork communication.
Telnet and FTP

14. 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?
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 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.
STP
Configure the switch so that it has lower priority than other switches in the network

15. 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)
The sequence number in the TCP header.
In an improperly implemented redundant topology
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Telnet and FTP

16. Which of the following are types of flow control?
Telnet and FTP
STP
Buffering - Cut-through - and Congestion avoidance
Hosts use a logical bus topology

17. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Fiber optic cable.
The interfaces must be configured for NAT.
Data link

18. 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.
Show cdp neighbor detail
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

19. Certkiller has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
VTP will allow switches to share VLAN configuration information
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.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
Physical Layer and Datalink Layer

20. 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?
Decrease the window size.
It is the sum of the costs based on bandwidth
It will prevent segment 1's broadcasts from getting to segment 2.
Learning - Listening - and Forwarding

21. 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
Duplex mismatch
Packet switching - Packet filtering and Internetwork communication.
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
VLAN and Swtich

22. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Increased latency and Filtering of all frame errors
Physical Layer and Datalink Layer
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.

23. Which of the following can lead to the contribution of LAN traffic congestion?
HTTPS
Learning - Listening - and Forwarding
Network
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth

24. Which one of the following characterisitcs is true regardigin the use of the hubs and switches?
To allow remote management of the switch.
All switch and bridge ports are in either the forwarding or blocking state.
VTP
Switches increase the number of collision domains in the network.

25. 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.
Serial0/1 is down - line protocol is down
It will prevent segment 1's broadcasts from getting to segment 2.
CertK Switch(config)# ip default-gateway 192.168.1.115

26. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
Auto - Desirable - and On
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Device Identifiers - Capabilities list - Platform
Certkiller B > trace

27. Cisco is the leader in the router market space. What basic functions do their routers perform in a network?
Network
Path selections and Packet switching.
Application
Encapsulations PPP and authentication CHAP

28. CDP is running between two CK devices. What information is supplied by CDP?
Device Identifiers - Capabilities list - Platform
Certkiller B > trace
VLAN and Swtich
The switch will forward the frame to a specific port

29. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Transport
MAC Address and Bridge Priority
HTTPS - SMTP - and TFTP
Decrease the window size.

30. 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?
MAC Address and Bridge Priority
This is an Ethernet port operating at half duplex
An electrical pulse indicates that the collision has cleared.
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

31. 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
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.
It operates without collisions and It provides faster data transfer
Show arp and Show interface
MAC Address and Bridge Priority

32. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Learning - Listening - and Forwarding
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.
The network layer
Information about a route should never be sent back in the direction from which the original update came.

33. Which of the following services use TCP?
SMTP FTP and HTTP
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.
Transport
In an improperly implemented redundant topology

34. Which fields are included in the TCP header?
Switches increase the number of collision domains in the network.
Layer 4
Show cdp neighbor detail
Source Port - Acknowledgment Number - and Window

35. Which OSI layer header contains the address of a destination host that is on another 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.
100 meters
To prevent switching loops in networks with redundant switched paths.
Network

36. 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?
Show arp and Show interface
A hub and A repeater.
In an improperly implemented redundant topology
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

37. As a CCNA candidate - you will be expected to know the OSI model very well. Which of the following are associated with the application layer (layer 7) of the OSI 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
Telnet and FTP
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.
CertK Switch(config)# ip default-gateway 192.168.1.115

38. 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?
CertK Switch(config)# ip default-gateway 192.168.1.115
Transport
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
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

39. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
Show cdp neighbor detail
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.

40. By default - which of the following factors determines the spanning-tree path cost?
STP
Congestion avoidance - Windowing and Buffering
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
It is the sum of the costs based on bandwidth

41. 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?
802.3ab and 802.3z
Increased latency and Filtering of all frame errors
Packet switching - Packet filtering and Internetwork communication.
Configure the switch so that it has a lower priority than other switches in the network.

42. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
Device Identifiers - Capabilities list - Platform
SMTP FTP and HTTP
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
802.1Q and ISL

43. 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
The switch will forward the frame to a specific port
HTTPS - SMTP - and TFTP
Transport

44. 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 sequence number in the TCP header.
A cross-over cable
Data link
A broadcast address will never be the source address of a frame

45. 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?
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
Learning - Listening - and Forwarding
A cross-over cable
The switch will forward the frame to a specific port

46. As a network Admin - you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of the devices in a WAN?
Application
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
Switches increase the number of collision domains in the network.

47. What kind of cable should be used to establish a trunked line between two Catalyst switches?
A cross-over cable
Source Port - Acknowledgment Number - and Window
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.
Transport

48. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Application
Device Identifiers - Capabilities list - Platform
Layer 4
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.

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?
A hub and A repeater.
Learning - Listening - and Forwarding
This is an Ethernet port operating at half duplex
Certkiller B > trace

50. 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?
Auto - Desirable - and On
Sequence number - Window size - and Acknowledgment number
Layer 4
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length