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CCNA - 2

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. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. minimizing of collisions b. division into broadcast domains
Destination Network Address
A. MTA b. SMTP

2. Why is flow control used for TCP data transfer?
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
A. Physical b. Data Link
To prevent the receiver from being overwhelmed by incoming data.
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other

3. When a device is moved from one network to the other...?
A. application b. presentation c. session d. transmision e. network f. data link g. physical
A. HTTP b. HTTPS
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
Originate data flow.

4. What is the purpose of a default gateway?
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
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. media sharing b. logical topology

5. What is a drawback of the CSMA/CD access method?
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Any device whose backoff timer expires first.
Collisions can decrease network performance.
It reduces unnecessary broadcasts.

6. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
Network
Fiber
A. it has centralized administration b. security is easier to enforce
To facilitate the entry and exit of data on media.

7. What is the purpose of the preamble in an ethernet frame?
A. addressing b. error detection c. frame delimiting
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A default gateway (router).
A. replace a switch w/ a router b. subnet the new networks

8. 2 functions of encapsulation
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
Source and Destination IP address
Console
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

9. 2 most commonly used media types in ethernet networks
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
A. copper UTP b. optical fiber
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Is a layer of specific encapsulation.

10. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
Router(config)# hostname Costas
Identify processes or services that are communicating with end devices.
A. perform degradation b. security issues c. host identification
IP is not properly installed

11. Why are port numbers included in the TCP header of a segment?
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
Hosts return to listen-before-transmit mode.
To enable a receiving host to forward the data to the appropriate application.
A. perform degradation b. security issues c. host identification

12. After an ethernet collision - which device has priority to transmit data?
Any device whose backoff timer expires first.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A. they initiate data exchanges b. they may upload data to servers

13. What is the role of MTA in handling email?
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Collisions can decrease network performance.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
To prevent the receiver from being overwhelmed by incoming data.

14. When do changes take effect in a Cisco router?
As the commands are entered.
A. perform degradation b. security issues c. host identification
UDP
The packets will be delivered and reassembled at destination.

15. 2 characteristics of clients in data networks
Supports error detection.
172.16.192.160
A. they initiate data exchanges b. they may upload data to servers
Router(config)# hostname Costas

16. Which device is used to create or divide broadcast domains?
Router
The MAC protocol can be very simple.
A. hot keys b. context-sensitive c. command syntax check
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

17. Which portion of the network layer address does a router use to forward packets?
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Transport
Network portion

18. What device can check for faults - integrity and performance of media?
To facilitate the entry and exit of data on media.
OTDR
It uses support from the lower layers to distinguish between connections to the service.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

19. 3 primary functions of the data link layer encapsulation
A. addressing b. error detection c. frame delimiting
It does not support encryption.
Host A
A. flow control b. session establishment c. numbering and sequencing

20. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Network portion
It has expanded adressing capabilities.
Hosts return to listen-before-transmit mode.
A. identifies the communicating applications b. identifies multiple conversations between the hosts

21. 3 features of IPv6
To enable a receiving host to forward the data to the appropriate application.
A. larger address space b. data types and classes of service c. authentication and encryption
172.16.192.160
A. DNS b. SMTP c. POP

22. What is a protocol that provides connectionless network layer services?
A. show startup-config b. show running-config
IP Protocol
Identify processes or services that are communicating with end devices.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

23. What are 2 protocols for transfering web resources?
A default gateway (router).
A. HTTP b. HTTPS
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
To facilitate the entry and exit of data on media.

24. What are 2 forms of application layer software?
A. application b. presentation c. session d. transmision e. network f. data link g. physical
A. application b. services
Hub
To facilitate the entry and exit of data on media.

25. What event occurs during the 3-way handshake?
80 (HTTP)
A. addressing b. error detection c. frame delimiting
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
TCP initializes the sequence numbers for the sessions.

26. 3 functions of the upper data link sublayer in the OSI model
Host mobility
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. it has centralized administration b. security is easier to enforce
8

27. During a TCP session - if packets arrive out of order - what will happen?
A backbone cable.
The packets will be delivered and reassembled at destination.
Next-Hop Address
80 (HTTP)

28. During encapsulation - what happens in the Data Link Layer?
A backbone cable.
Network Media Control
The physical address is added.
A. low overhead b. connectionless

29. What are 2 commands used to view a host routing table?
A. next-hop b. metric/interface c. destination network address
Originate data flow.
A. netstat -r b. route PRINT
The packets will be delivered and reassembled at destination.

30. What are 2 common characteristics associated w/ dynamic routing protocols?
Rollover cable
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

31. What is a default gateway address?

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32. Which layer supplies services and allows user interface?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
Application Layer
A backbone cable.
Ctrl + Shift + 6

33. What is an automated service that matches resource names w/ required IP addresses?
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
As the commands are entered.
A. addressing b. error detection c. frame delimiting
DNS

34. What command is used to change the default name to 'Costas'?
To enable a receiving host to forward the data to the appropriate application.
Is used by the server to resolve names.
Router(config)# hostname Costas
Any device whose backoff timer expires first.

35. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
MAC
A. MTA b. SMTP
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
UDP

36. What is a characteristic of a logical point-to-point topology?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
A. perform degradation b. security issues c. host identification
The MAC protocol can be very simple.
MAC

37. An admin needs to keep contents private - which access method should he use?
It uses support from the lower layers to distinguish between connections to the service.
Source Port
SSH
Source and Destination IP address

38. What is the proper order of the OSI Layers?
Signal loss can be experienced.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
A backbone cable.
A. Cat5 UTP b. Cat6 UTP

39. There are too many broadcasts on switches - what can be done?
FTP
A. replace a switch w/ a router b. subnet the new networks
RJ-45
The address of the router that the host will use to 'get to the other side'.

40. Which type of cable is most often associated w/ fiber-optic cable?
0 to 1023
A physical topology.
A. copper UTP b. optical fiber
A backbone cable.

41. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
Network Layer
DNS
A random delay helps prevent the stations from experiencing another collision during transmission.
A. HTTP b. HTTPS

42. At which layer of the TCP/IP model does ethernet operate?
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Network Access

43. What is the function of the DLL?
A random delay helps prevent the stations from experiencing another collision during transmission.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
It provides for the exchange of data over a common local media.
The address of the router that the host will use to 'get to the other side'.

44. Important characteristic of UDP
Network
Minimal delays in data delivery.
Collisions can decrease network performance.
A. MTA b. SMTP

45. What describes the purpose of default route?
2046
Rollover cable
A. low overhead b. connectionless
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

46. What are 3 properties of contention-based media access for a shared media?
Physical
A. non-deterministic b. less overhead c. collisions exist
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. application b. presentation c. session d. transmision e. network f. data link g. physical

47. What makes fiber preferable to copper for interconnecting buildings?
Logical Link Control sublayer
Network Media Control
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

48. What characteristic of an UTP helps reduce interference?
Flash
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
To enable a receiving host to forward the data to the appropriate application.
Twisting of the cables

49. 3 common problems w/ a large network
A. performance degradation b. security issues c. host identification
The magnetic field around the adjacent pairs of wire.
TCP initializes the sequence numbers for the sessions.
80 (HTTP)

50. 3 factors that should be considered when implementing Layer 2 protocols
A. purpose b. geographic location c. ownership
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
A. DNS b. SMTP c. POP
A. identifies the communicating applications b. identifies multiple conversations between the hosts