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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 of the following services use TCP?
SMTP FTP and HTTP
Duplex mismatch
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Buffering - Cut-through - and Congestion avoidance

2. 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.
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
Physical Layer and Datalink Layer
Application

3. Which two statements describe the operation of the CSMA/CD access method - which is in use on the Certkiller network?
Switches increase the number of collision domains in the network.
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
An additional broadcast domain will be created.
In an improperly implemented redundant topology

4. Which two of the following values does STP take into consideration when it elects the root bridge?
The Bridgeg ID and The bridge priority
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
Device Identifiers - Capabilities list - Platform
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth

5. The system LED is amber on a new Certkiller Catalyst 2950 series switch. What does this indicate?
In an improperly implemented redundant topology
The system is malfunctioning.
It will prevent segment 1's broadcasts from getting to segment 2.
STP

6. 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?
HTTPS
Switches increase the number of collision domains in the network.
100 meters
Hosts use a logical bus topology

7. 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.
Switches increase the number of collision domains in the network.
The network layer
Application
Port security

8. When a switch port is used as a VLAN trunk - which of the following trunk modes are valid?
An electrical pulse indicates that the collision has cleared.
Auto - Desirable - and On
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
This is an Ethernet port operating at half duplex

9. 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?
The system is malfunctioning.
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.
Certkiller B > trace
Data link

10. 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?
Switches increase the number of collision domains in the network.
Show cdp neighbor detail
Learning - Listening - and Forwarding
Transport

11. CDP is running between two CK devices. What information is supplied by CDP?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Device Identifiers - Capabilities list - Platform
CertK Switch(config)# ip default-gateway 192.168.1.115
Serial0/1 is down - line protocol is down

12. 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?
The network layer
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
Congestion avoidance - Windowing and Buffering
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

13. Which OSI layer header contains the address of a destination host that is on another network?
Network
Show cdp neighbor detail
Application
Source Port - Acknowledgment Number - and Window

14. Acknowledgements - sequencing - and flow control are functions that are handled by which layer of the OSI model?
Serial0/1 is down - line protocol is down
The interfaces must be configured for NAT.
Layer 4
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length

15. 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?
Decrease the window size.
Switches increase the number of collision domains in the network.
The interfaces must be configured for NAT.
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.

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
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.
Layer 4
Fiber optic cable.

17. You are experiencing intermittent issues relating to congestion within the Certkiller network. What are the possible causes of congestion on this LAN?
Application
Show cdp neighbor detail
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
802.1Q and ISL

18. Which of the following devices can the Certkiller network administrator use to segment the LAN?
Switches - Bridges - and Routers
Filtering can occur based on Layer 3 information and Broadcasts are not forwarded across the router
802.3ab and 802.3z
Configure the switch so that it has lower priority than other switches in the network

19. 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?
Port security
Physical Layer and Datalink Layer
Path selections and Packet switching.
STP

20. Which of the protocols below - operates at Layer 2 of the OSI model - and is used to maintain a loop-free network?
Show cdp neighbor detail
VTP
STP
Network

21. 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?
Auto - On - and Desirable
In an improperly implemented redundant topology
The network layer
STP

22. At which OSI layer is a logical path created between two host systems named CK1 and CK2 on the Certkiller LAN?
Network
The interfaces must be configured for NAT.
Path selections and Packet switching.
Learning - Listening - and Forwarding

23. Which of following VLAN frame encapsulation types are configurable on a Cisco switch?
SMTP - FTP - HTTP - and HTTPS
Configure the switch so that it has lower priority than other switches in the network
802.1Q and ISL
ARP and ICMP

24. In which circumstance are multiple copies of the same unicast frame likely to be transmitted in the Certkiller Switched LAN?
Telnet and FTP
The system is malfunctioning.
In an improperly implemented redundant topology
Switches - Bridges - and Routers

25. What is the purpose of the spanning-tree algorithm in a switched LAN?
To prevent switching loops in networks with redundant switched paths.
Serial0/1 is down - line protocol is down
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Layer 4

26. At which layer of the OSI model does the protocol that provides the information displayed by the 'show cdp neighbors' command operate?
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Data link
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
Source Port - Acknowledgment Number - and Window

27. What are two characteristics of 'store and forward' switching?
Layer 3
The system is malfunctioning.
The switch receives the complete frame before beginning to forward it. and Latency through the switch varies with frame length
Show cdp neighbor detail

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
Layer 4
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.
Data link
Layer 3

29. In a switched LAN network - What is the Spanning-Tree algorithm used for?
Layer 3
Source Port - Acknowledgment Number - and Window
Duplex mismatch
It is used to prevent switching loops in networks with redundant switched routes.

30. 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 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
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
Decrease the window size.

31. 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?
Application
ARP and ICMP
An additional broadcast domain will be created.
Show arp and Show interface

32. What kind of cable should be used to establish a trunked line between two Catalyst switches?
Increased latency and Filtering of all frame errors
SMTP FTP and HTTP
Packet switching - Packet filtering and Internetwork communication.
A cross-over cable

33. 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?
Buffering - Cut-through - and Congestion avoidance
In an improperly implemented redundant topology
An additional broadcast domain will be created.
Decrease the window size.

34. 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?
Physical Layer and Datalink Layer
Duplex mismatch
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

35. Which of the following are true of Ethernet technology?
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.
Hosts use a logical bus topology
An additional broadcast domain will be created.
A hub and A repeater.

36. Which OSI layer is associated with the following: The acknowledgment of transmissions - sequencing - and flow control across a network?
Auto - On - and Desirable
Layer 4
The system is malfunctioning.
They can provide hosts with information about network problems. and They are encapsulated within IP datagrams.

37. By default - which of the following factors determines the spanning-tree path cost?
It is the sum of the costs based on bandwidth
Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
Layer 4

38. 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.
The Bridgeg ID and The bridge priority
Network
Half-duplex Ethernet operates in a shared collision domain. and Half-duplex Ethernet has lower effective throughput.

39. Which of the protocols below use TCP at the transport layer?
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
SMTP - FTP - HTTP - and HTTPS
A broadcast domain with too many hosts - Broadcast storms - and Low bandwidth
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses

40. Why is full-duplex Ethernet superior to its single-duplex counterpart?
In an improperly implemented redundant topology
It is used to prevent switching loops in networks with redundant switched routes.
It operates without collisions and It provides faster data transfer
SMTP FTP and HTTP

41. Two stations on the Certkiller LAN transmit at the same time - resulting in a collision. What happens when a collision occurs on the network?
Sequence number - Window size - and Acknowledgment number
Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth
It is used to prevent switching loops in networks with redundant switched routes.
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.

42. What is the IEEE standard associated with Gigabit Ethernet?
Application
It is the sum of the costs based on bandwidth
802.3ab and 802.3z
The network layer

43. 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.
The network layer
Increased latency and Filtering of all frame errors
It is used to prevent switching loops in networks with redundant switched routes.

44. 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?
Allowing simultaneous frame transmissions and filtering frames based on MAC addresses
It will prevent segment 1's broadcasts from getting to segment 2.
Port security
Information about a route should never be sent back in the direction from which the original update came.

45. Which of the following can lead to the contribution of LAN traffic congestion?
Too many hosts in a broadcast domain - Broadcast storms and Low bandwidth
A broadcast address will never be the source address of a frame
Switches increase the number of collision domains in the network.
To prevent switching loops in networks with redundant switched paths.

46. When comparing and contrasting the similarities and differences between bridges and switches - which of the following are valid statements?
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.
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
CertK Switch(config)# ip default-gateway 192.168.1.115

47. Which of the following commands would be applied to a WAN interface - but not on LAN Interface?
Packet switching - Packet filtering and Internetwork communication.
STP
VLAN and Swtich
Encapsulations PPP and authentication CHAP

48. Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?
It is the sum of the costs based on bandwidth
Half-duplex Ethernet uses a loopback circuit to detect collisions. and Full-duplex Ethernet makes use of two pairs of wires for data.
An additional broadcast domain will be created.
The system is malfunctioning.

49. Which three of the protocols below belong to the application layer? (Select three answer choices)
Application
HTTPS - SMTP - and TFTP
This is an Ethernet port operating at half duplex
Auto - On - and Desirable

50. 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.
Configure the switch so that it has lower priority than other switches in the network
A switch is a multiport bridge and Bridges and switches learn Mac addresses by examining the source MAC address of each frame received.
Packet switching - Packet filtering and Internetwork communication.

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