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. Which of the following services use TCP?
Decrease the window size.
Fiber optic cable.
Certkiller B > trace
SMTP FTP and HTTP

2. What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?
The port is experiencing errors
ARP and ICMP
All switch and bridge ports are in either the forwarding or blocking state.
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.

3. 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?
Sequence number - Window size - and Acknowledgment number
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
Show cdp neighbor detail
Certkiller B > trace

4. 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?
Serial0/1 is down - line protocol is down
HTTPS - SMTP - and TFTP
Configure the switch so that it has lower priority than other switches in the network
SMTP FTP and HTTP

5. 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?
All switch and bridge ports are in either the forwarding or blocking state.
STP
Increased latency and Filtering of all frame errors
Source Port - Acknowledgment Number - and Window

6. 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?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Decrease the window size.
Show arp and Show interface

7. Which protocol uses TCP port 443 at layer 4?
HTTPS
Layer 4
Layer 3
VLAN and Swtich

8. Which OSI layer header contains the address of a destination host that is on another network?
VTP
CertK Switch(config)# ip default-gateway 192.168.1.115
Port security
Network

9. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
STP
An additional broadcast domain will be created.
To allow remote management of the switch.
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

10. What is the IEEE standard associated with Gigabit Ethernet?
Certkiller B > trace
All switch and bridge ports are in either the forwarding or blocking state.
802.3ab and 802.3z
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.

11. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
To allow remote management of the switch.
A hub and A repeater.
Telnet and FTP
Auto - Desirable - and On

12. Which Layer 4 protocol is used for a Telnet connections between two CK routers?
Hosts use a logical bus topology
All switch and bridge ports are in either the forwarding or blocking state.
TCP
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

13. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
To prevent switching loops in networks with redundant switched paths.
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
The system is malfunctioning.
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.

14. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
Hosts use a logical bus topology
A CSU/DSU terminates a digital local loop - A modem terminates an analog local loop - A router is commonly considered a DTE device.
The switch will forward the frame to a specific port

15. 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?
100 meters
Layer 4
Packet switching - Packet filtering and Internetwork communication.
VTP

16. 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
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
It is used to prevent switching loops in networks with redundant switched routes.
Fiber optic cable.
Auto - Desirable - and On

17. Split horizon has been enabled within the Certkiller routed network. Which one of the following statements best explains the split horizon rule?
Information about a route should never be sent back in the direction from which the original update came.
Application
Learning - Listening - and Forwarding
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router

18. 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?
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
Port security
Certkiller B > trace
VTP will allow switches to share VLAN configuration information

19. Which layer of the OSI reference model is responsible for ensuring reliable end to end delivery of data?
Hosts use a logical bus topology
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
Transport

20. The corporate head office of Certkiller has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence - wh
Layer 4
UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
The system is malfunctioning.

21. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Data link
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.
Encapsulations PPP and authentication CHAP
It is used to prevent switching loops in networks with redundant switched routes.

22. 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?
A cross-over cable
The switch will forward the frame to a specific port
It is the sum of the costs based on bandwidth
Path selections and Packet switching.

23. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Layer 4
802.3ab and 802.3z
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.
Switches increase the number of collision domains in the network.

24. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
802.1Q and ISL
Packet switching - Packet filtering and Internetwork communication.
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

25. In a switched LAN network - What is the Spanning-Tree algorithm used for?
MAC Address and Bridge Priority
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 is used to prevent switching loops in networks with redundant switched routes.
Buffering - Cut-through - and Congestion avoidance

26. 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?
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.
100 meters
Physical Layer and Datalink Layer
Layer 4

27. 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?
Show arp and Show interface
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Data link
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.

28. 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
Increased latency and Filtering of all frame errors
Learning - Listening - and Forwarding
Data link
In an improperly implemented redundant topology

29. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
Configure the switch so that it has lower priority than other switches in the network
Data link
Auto - On - and Desirable
Data link

30. CDP is running between two CK devices. What information is supplied by CDP?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Data link
Device Identifiers - Capabilities list - Platform
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.

31. 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
The port is experiencing errors
Increased latency and Filtering of all frame errors
Configure the switch so that it has lower priority than other switches in the network

32. 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
Fiber optic cable.
CertK Switch(config)# ip default-gateway 192.168.1.115
The sequence number in the TCP header.
Congestion avoidance - Windowing and Buffering

33. 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?
Hosts use a logical bus topology
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
The interfaces must be configured for NAT.
The switch will forward the frame to a specific port

34. 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
The switch will forward the frame to a specific port
Show arp and Show interface
Fiber optic cable.
Increased latency and Filtering of all frame errors

35. 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
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.
Configure the switch so that it has a lower priority than other switches in the network.
Fiber optic cable.
Duplex mismatch

36. Which fields are included in the TCP header?
This is an Ethernet port operating at half duplex
Show arp and Show interface
Source Port - Acknowledgment Number - and Window
An electrical pulse indicates that the collision has cleared.

37. 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 Bridgeg ID and The bridge priority
Fiber optic cable.
A broadcast address will never be the source address of a frame
Layer 3

38. CK1 is a switch in the Certkiller network. Why will CK1 never learn the broadcast address?
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.
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.
Path selections and Packet switching.
A broadcast address will never be the source address of a frame

39. 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?
802.3ab and 802.3z
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Duplex mismatch
Telnet and FTP

40. 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
Serial0/1 is down - line protocol is down
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.
VLAN and Swtich
The system is malfunctioning.

41. 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?
All switch and bridge ports are in either the forwarding or blocking state.
Telnet and FTP
Port security
Certkiller B > trace

42. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Port security
Sequence number - Window size - and Acknowledgment number
Information about a route should never be sent back in the direction from which the original update came.

43. 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?
The switch will forward the frame to a specific port
An additional broadcast domain will be created.
A cross-over cable
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

44. You need to perform some initial configuration tasks on a new Certkiller switch. What are the possible trunking modes for this switch port?
802.1Q and ISL
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.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Auto - On - and Desirable

45. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
A hub and A repeater.
802.3ab and 802.3z
Fiber optic cable.

46. Which of the following are true of Ethernet technology?
Device Identifiers - Capabilities list - Platform
Congestion avoidance - Windowing and Buffering
Layer 4
Hosts use a logical bus topology

47. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Data link
Layer 4
Packet switching - Packet filtering and Internetwork communication.
To allow remote management of the switch.

48. 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
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.
It is the sum of the costs based on bandwidth
Show arp and Show interface

49. You want to upgrade the Certkiller LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?
802.3ab and 802.3z
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Increased latency and Filtering of all frame errors

50. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
CertK Switch(config)# ip default-gateway 192.168.1.115
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.
802.1Q and ISL
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.