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CCNA - 2

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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 transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
Binary ANDing
UDP
RJ-45
Any device whose backoff timer expires first.

2. Which characteristics describe fiber optic cable?
UDP
Host A
Time-to-live (TTL)
A. not affected by EMI of RFI b. most expensive type of LAN cabling

3. What are 2 forms of application layer software?
A. application b. services
Source Port
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
Time-to-live (TTL)

4. What are 3 properties of contention-based media access for a shared media?
A. non-deterministic b. less overhead c. collisions exist
32 bits
MAC
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other

5. What do the intermediary devices in the network do?
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
It provides interface between applications on either end of the network.
It uses support from the lower layers to distinguish between connections to the service.

6. During encapsulation - what happens in the Data Link Layer?
255.255.255.224
Flash
To enable a receiving host to forward the data to the appropriate application.
The physical address is added.

7. Which 2 options represent Layer 4 addressing?
It has expanded adressing capabilities.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
The magnetic field around the adjacent pairs of wire.
IP Protocol

8. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
255.255.255.224
Source Port
Network Layer Packet

9. What is the purpose of the preamble in an ethernet frame?
It provides interface between applications on either end of the network.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
When connecting a host to a switch.
Fiber

10. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
A. servers b. routers c. network printers
Hosts return to listen-before-transmit mode.
Router(config)# interface FastEthernet 0/1
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

11. 3 statements about routes and their use
A. router b. firewall
A. if destination network is directly connected - router forwards packet to destination host b. if no route exists for the destination and the default route is present - packet if fowarded to the next-hop c. if the originating host has a default gate
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Network Media Control

12. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
A. enable mode b. priviledge executive mode
OTDR
As the commands are entered.
DNS

13. What networking devices are recommended to be assigned static IP addresses?
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
To enable a receiving host to forward the data to the appropriate application.
Collisions can decrease network performance.
A. servers b. routers c. network printers

14. If there is a graphic representation of a company network wiring and equipment - What is this called?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
A. servers b. routers c. network printers
A physical topology.
A. low overhead b. connectionless

15. A company is planning to subnet a network w/ 27 hosts. What would be the subnet mask used for this?
255.255.255.224
A. performance degradation b. security issues c. host identification
Fiber
Is a layer of specific encapsulation.

16. What is the purpose of the TCP/IP Network Application Layer?
SMB
Network Layer
A. not affected by EMI of RFI b. most expensive type of LAN cabling
Network Media Control

17. 2 common methods for settin a UTP ethernet port to MDI or MDIX?
A. larger address space b. data types and classes of service c. authentication and encryption
A. servers b. routers c. network printers
Logical Link Control sublayer
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

18. What can be a problem that is reduced by adding end-to-end addressing?
It reduces unnecessary broadcasts.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. enable mode b. priviledge executive mode
When connecting a host to a switch.

19. What is the purpose of a default gateway?
Identify the device that allows local network computers to communicate w/ devices in other networks.
RJ-45
It provides for the exchange of data over a common local media.
It reduces unnecessary broadcasts.

20. What command will you use to place the router into the correct mode to configure an appropiate interface to connect a LAN?
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
A. physical layer b. DLL layer
Signal loss can be experienced.
Router(config)# interface FastEthernet 0/1

21. Group of hosts that have identical bit patterns in the high order bits of their addresses
A random delay helps prevent the stations from experiencing another collision during transmission.
Any device whose backoff timer expires first.
SMB
Network

22. What determines the method of media access control?
A. Physical b. Data Link
A. media sharing b. logical topology
A. identifies pieces of data as part of the same communication b. ensures the data pieces can be directed to the correct receiving end device
80 (HTTP)

23. How many host addresses can be assigned to a subnetwork when using the 130.68.0.0 network address w/ a subnet mask of 255.255.248.0?
As the commands are entered.
Is a layer of specific encapsulation.
2046
A. identifies the communicating applications b. identifies multiple conversations between the hosts

24. During a TCP session - if packets arrive out of order - what will happen?
Application Layer
A. non-deterministic b. less overhead c. collisions exist
The packets will be delivered and reassembled at destination.
Network portion

25. What command can be used to determine if the router has experienced any input or output errors?
A. perform degradation b. security issues c. host identification
A. application b. presentation c. session d. transmision e. network f. data link g. physical
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
Show Interfaces

26. Network Protocols
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. application b. services
As the commands are entered.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

27. At which layers of the OSI model does ethernet operate?
A. media sharing b. logical topology
A. physical layer b. DLL layer
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Router

28. What is the primary rope of the physical layer in transmitting data?
Create signals that represent the bits in each frame for the media.
Switch
The magnetic field around the adjacent pairs of wire.
A. router b. firewall

29. 3 primary functions of the data link layer encapsulation
A. HTTP b. HTTPS
SSH
A. addressing b. error detection c. frame delimiting
Destination is not contacted before a packet is sent.

30. What do you need to use for an initial configuration on a Cisco router?
Console interface
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
UTP
Show Interfaces

31. After a routers ends its boot sequence - the admin wants to check the routers config. From the EXEC mode - which commands can the admin use?
Console
It uses support from the lower layers to distinguish between connections to the service.
A. show startup-config b. show running-config
A. servers b. routers c. network printers

32. What makes fiber preferable to copper for interconnecting buildings?
A. copper UTP b. optical fiber
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. next-hop b. metric/interface c. destination network address
A. private addresses are blocked from public internet by routers b. the ip address 127.0.0.1 is the loopback - directs traffic to itself

33. If you have a small network w/ 3 computers...
A. security is difficult to enforce b. if one of the computers is responding to file sharing requests - that computer is functioning as a server
0 to 1023
As the commands are entered.
172.16.192.160

34. 2 features that make switches preferable to hubs
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. Physical b. Data Link
A. minimizing of collisions b. division into broadcast domains
Time-to-live (TTL)

35. What is a disadvantage of Telnet?
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
It does not support encryption.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A. show startup-config b. show running-config

36. If you have a PC - 3 routers and a Laptop... How many unique CRC calculation will take place as traffic routes from the PC to the Laptop?
A. HTTP b. HTTPS
It has expanded adressing capabilities.
8
Console

37. How many bits make up an IPv4 address?
Binary ANDing
To prevent the receiver from being overwhelmed by incoming data.
32 bits
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long

38. When is a straight-through cable used in a network?
A. acts as both client and server w/ same communication b. hybrid mode includes a centralized directory of files c. can be used in client-server networks
Transport
When connecting a host to a switch.
A. DNS b. SMTP c. POP

39. What are 2 email components used to forward mail between servers?
A. perform degradation b. security issues c. host identification
A. application b. presentation c. session d. transmision e. network f. data link g. physical
A. ethernet utilizes CSMA/CD b. defined as placement of data frames on the media c. DLL protocols define the rules for access to different media
A. MTA b. SMTP

40. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
A. purpose b. geographic location c. ownership
Router(config)# hostname Costas
Create signals that represent the bits in each frame for the media.
255.255.255.0

41. What is the primary purpose of ARP?
Show Interfaces
It reduces unnecessary broadcasts.
Resolve IPv4 addresses to MAC addresses.
To prevent the receiver from being overwhelmed by incoming data.

42. What are 2 protocols for transfering web resources?
A. servers b. routers c. network printers
A. HTTP b. HTTPS
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Console

43. An admin needs to keep contents private - which access method should he use?
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. minimizing of collisions b. division into broadcast domains
SSH
OTDR

44. Which layer supplies services and allows user interface?
A. hot keys b. context-sensitive c. command syntax check
Application Layer
Transport
Static

45. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
A. addressing b. error detection c. frame delimiting
Destination Network Address
It reduces unnecessary broadcasts.
Window Size

46. When a device is moved from one network to the other...?
Destination Network Address
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
RJ-45
A. the device will still operate at the same Layer 2 address (the address it had before) b. Layer 3 address must me reassigned for it to communicate w/ the network

47. 3 statements of media acess control
2046
A. ethernet utilizes CSMA/CD b. defined as placement of data frames on the media c. DLL protocols define the rules for access to different media
255.255.255.0
A. identifies pieces of data as part of the same communication b. ensures the data pieces can be directed to the correct receiving end device

48. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
A. private addresses are blocked from public internet by routers b. the ip address 127.0.0.1 is the loopback - directs traffic to itself
A. identifies pieces of data as part of the same communication b. ensures the data pieces can be directed to the correct receiving end device
Network Access
Fiber

49. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
A random delay helps prevent the stations from experiencing another collision during transmission.
A. if destination network is directly connected - router forwards packet to destination host b. if no route exists for the destination and the default route is present - packet if fowarded to the next-hop c. if the originating host has a default gate
Show Interfaces
Destination Network Address

50. 2 most commonly used media types in ethernet networks
A. copper UTP b. optical fiber
A. Physical b. Data Link
A. larger address space b. data types and classes of service c. authentication and encryption
Logical Link Control sublayer

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CCNA - 2

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