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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. What layer encapsulates segments into packets?
Network Layer
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Network Access
Switch

2. What is the purpose of resource records in DNS?
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
172.16.192.160
Originate data flow.
Is used by the server to resolve names.

3. Which sublayer of the DLL prepares a signal to be transmitted at the physical layer?
When connecting a host to a switch.
RJ-45
UDP
MAC

4. What are 2 email components used to forward mail between servers?
0 to 1023
A. MTA b. SMTP
To prevent the receiver from being overwhelmed by incoming data.
A. application b. presentation c. session d. transmision e. network f. data link g. physical

5. How does the application layer on a server process multiple client requests for services?
Source and Destination Ports
Next-Hop Address
IP Protocol
It uses support from the lower layers to distinguish between connections to the service.

6. 3 characteristics of valid Ethernet Layer 2 addresses
Resolve IPv4 addresses to MAC addresses.
A. physical layer b. DLL layer
Create signals that represent the bits in each frame for the media.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

7. If you have a small network w/ 3 computers...
A. it has centralized administration b. security is easier to enforce
Is a layer of specific encapsulation.
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
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

8. 3 facts about the network portion of an IPv4 address
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
Twisting of the cables
Resolve IPv4 addresses to MAC addresses.

9. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Console interface
It provides interface between applications on either end of the network.
A. enable mode b. priviledge executive mode
Supports error detection.

10. What are 2 protocols for transfering web resources?
Is a layer of specific encapsulation.
RJ-45
It provides for the exchange of data over a common local media.
A. HTTP b. HTTPS

11. What are 2 common characteristics associated w/ dynamic routing protocols?
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
Hub
Minimal delays in data delivery.
A. minimizing of collisions b. division into broadcast domains

12. What are 2 forms of application layer software?
A. application b. services
Show Interfaces
The destination host address.
The MAC protocol can be very simple.

13. 3 properties of peer-2-peer applications
To facilitate the entry and exit of data on media.
Network Layer Packet
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
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

14. Which type of cable is most often associated w/ fiber-optic cable?
A. application b. services
A backbone cable.
Twisting of the cables
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other

15. What is an automated service that matches resource names w/ required IP addresses?
It has expanded adressing capabilities.
The physical address is added.
DNS
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

16. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
A. they initiate data exchanges b. they may upload data to servers
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
Physical
Resolve IPv4 addresses to MAC addresses.

17. What is the role of MTA in handling email?
8
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. netstat -r b. route PRINT
It provides interface between applications on either end of the network.

18. 3 factors that should be considered when implementing Layer 2 protocols
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
Physical
It uses support from the lower layers to distinguish between connections to the service.
Console

19. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
Collisions can decrease network performance.
Network portion
UDP
Application Layer

20. What is PDU?
Is a layer of specific encapsulation.
Next-Hop Address
It uses support from the lower layers to distinguish between connections to the service.
TCP initializes the sequence numbers for the sessions.

21. 3 statements of media acess control
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
Signal loss can be experienced.
To prevent the receiver from being overwhelmed by incoming data.
The MAC protocol can be very simple.

22. When a network service fails - which port is most often used to access a router for management purposes?
8
Signal loss can be experienced.
SSH
Console

23. 3 statements about the role of routers in the network
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
It uses support from the lower layers to distinguish between connections to the service.
Console
They must wait until the first hosts finish transfering the media.

24. Group of hosts that have identical bit patterns in the high order bits of their addresses
A. Cat5 UTP b. Cat6 UTP
IP Protocol
Network
It uses lasers as the light source.

25. Which IP packet field will prevent endless loops?
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. Physical b. Data Link
Time-to-live (TTL)
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

26. What is the primary purpose of ARP?
Originate data flow.
Resolve IPv4 addresses to MAC addresses.
Host A
Console

27. 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?
8
Is a layer of specific encapsulation.
Originate data flow.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet

28. To make a console connection from a comp to a Cisco router - what cable should be used?
2046
It uses lasers as the light source.
Collisions can decrease network performance.
Rollover cable

29. What info is found in the TCP and UDP header info?
Source and Destination Ports
SSH
Network Access
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery

30. 2 features that make switches preferable to hubs
A. perform degradation b. security issues c. host identification
A. minimizing of collisions b. division into broadcast domains
A. replace a switch w/ a router b. subnet the new networks
A random delay helps prevent the stations from experiencing another collision during transmission.

31. Default Gateway is incorrect on the host - What is the impact on the communications?
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
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
DNS
A. next-hop b. metric/interface c. destination network address

32. Intermediary devices used to implement security between networks
Router
Originate data flow.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. router b. firewall

33. At which layers of the OSI model does ethernet operate?
As the commands are entered.
Transport
A. physical layer b. DLL layer
A. next-hop b. metric/interface c. destination network address

34. 2 functions of encapsulation
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A random delay helps prevent the stations from experiencing another collision during transmission.
Console interface
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

35. What networking devices are recommended to be assigned static IP addresses?
Next-Hop Address
2046
A. servers b. routers c. network printers
RJ-45

36. An admin needs to keep contents private - which access method should he use?
IP is not properly installed
Source and Destination IP address
UTP
SSH

37. When destination network is not in the routing table - What are 2 actions the router might take?
It has expanded adressing capabilities.
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
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. router b. firewall

38. After a browser makes a request to a web server in the standard port - what will be the port number in the TCP header?
As the commands are entered.
Signal loss can be experienced.
Hosts return to listen-before-transmit mode.
80 (HTTP)

39. What causes crosstalk within cable pairs when using UTP?
OTDR
2046
A. decentralized resources b. resource sharing w/o a dedicated server
The magnetic field around the adjacent pairs of wire.

40. Which portion of the network layer address does a router use to forward packets?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Network portion
A. non-deterministic b. less overhead c. collisions exist
SMB

41. What does the IEEE 802.2 standard represent in Ethernet technologies?
2046
Logical Link Control sublayer
No collisions will occur on this link.
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long

42. Why are port numbers included in the TCP header of a segment?
Router(config)# hostname Costas
To enable a receiving host to forward the data to the appropriate application.
A. DB 60 b. Winchester 15-pin c. smart serial
UTP

43. What is the primary rope of the physical layer in transmitting data?
A. netstat -r b. route PRINT
Create signals that represent the bits in each frame for the media.
Network Access
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)

44. What are key considering factors when grouping hosts into common networks?
Network
Supports error detection.
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. purpose b. geographic location c. ownership

45. What command is used to change the default name to 'Costas'?
Router(config)# hostname Costas
Signal loss can be experienced.
Host mobility
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

46. Which device is used to create or divide broadcast domains?
Router
UDP
A. media sharing b. logical topology
A. goodput b. throughput c. bandwidth

47. What are 2 features of User Diagram Protocol (UDP)?
A. low overhead b. connectionless
It has expanded adressing capabilities.
A. media sharing b. logical topology
255.255.255.224

48. What describes the purpose of default route?
To prevent the receiver from being overwhelmed by incoming data.
Static
Is a layer of specific encapsulation.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

49. 2 common methods for settin a UTP ethernet port to MDI or MDIX?
Twisting of the cables
Window Size
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
A. perform degradation b. security issues c. host identification

50. 3 functions of the upper data link sublayer in the OSI model
SSH
2046
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
Minimal delays in data delivery.