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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 is the purpose of resource records in DNS?
Static
A. performance degradation b. security issues c. host identification
Is used by the server to resolve names.
UTP

2. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
32 bits
Hosts return to listen-before-transmit mode.
255.255.255.224
A random delay helps prevent the stations from experiencing another collision during transmission.

3. 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?
A. replace a switch w/ a router b. subnet the new networks
Router
A. show startup-config b. show running-config
Resolve IPv4 addresses to MAC addresses.

4. 2 most commonly used media types in ethernet networks
A. copper UTP b. optical fiber
Show Interfaces
A. performance degradation b. security issues c. host identification
Create signals that represent the bits in each frame for the media.

5. What are 2 email components used to forward mail between servers?
A. decentralized resources b. resource sharing w/o a dedicated server
UTP
A. MTA b. SMTP
It uses support from the lower layers to distinguish between connections to the service.

6. What method of signal transmission uses radio waves to carry signals?
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. they initiate data exchanges b. they may upload data to servers
Fiber
Wireless

7. What are 3 pieces of info about a route contained in a routing table?
A. next-hop b. metric/interface c. destination network address
Network Layer
It uses support from the lower layers to distinguish between connections to the service.
Show Interfaces

8. What is an automated service that matches resource names w/ required IP addresses?
Application Layer
Host A
IP is not properly installed
DNS

9. Which 2 options represent Layer 4 addressing?
A. identifies the communicating applications b. identifies multiple conversations between the hosts
Window Size
To facilitate the entry and exit of data on media.
Twisting of the cables

10. What determines the method of media access control?
Router
A. media sharing b. logical topology
Network
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

11. What is the role of MTA in handling email?
A. the router will discard the packet b. the router will send a time exceeded message to the source host
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

12. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
A. enable mode b. priviledge executive mode
Is a layer of specific encapsulation.
A. servers b. routers c. network printers
Window Size

13. What is the primary reason for developing IPv6?
2046
It provides for the exchange of data over a common local media.
It has expanded adressing capabilities.
Window Size

14. What is the purpose of a default gateway?
0 to 1023
Identify the device that allows local network computers to communicate w/ devices in other networks.
Console
A. non-deterministic b. less overhead c. collisions exist

15. What event occurs during the 3-way handshake?
No collisions will occur on this link.
TCP initializes the sequence numbers for the sessions.
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Wireless

16. What is PDU?
A. it has centralized administration b. security is easier to enforce
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Is a layer of specific encapsulation.
A. identifies the communicating applications b. identifies multiple conversations between the hosts

17. In a connectionless system - What is correct?
A. replace a switch w/ a router b. subnet the new networks
It provides interface between applications on either end of the network.
Destination is not contacted before a packet is sent.
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

18. An admin wants to evaluate all traffic in a network. To ensure that all packets are captured - what network device should be used?
RJ-45
A. decentralized resources b. resource sharing w/o a dedicated server
Hub
A. replace a switch w/ a router b. subnet the new networks

19. If you want to connect 4 hosts in a home network - what would be the best deviced to be used?
Transport
Identify processes or services that are communicating with end devices.
Switch
Console interface

20. Why is flow control used for TCP data transfer?
255.255.255.0
Destination is not contacted before a packet is sent.
To prevent the receiver from being overwhelmed by incoming data.
A. application b. services

21. What layer encapsulates segments into packets?
Network Layer Packet
A. next-hop b. metric/interface c. destination network address
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Network Layer

22. What is a benefit of a WAN?
Host mobility
Network Media Control
Next-Hop Address
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

23. What describes the purpose of default route?
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. HTTP b. HTTPS
Console
Fiber

24. Which IP packet field will prevent endless loops?
A. DB 60 b. Winchester 15-pin c. smart serial
To facilitate the entry and exit of data on media.
The packets will be delivered and reassembled at destination.
Time-to-live (TTL)

25. When is a straight-through cable used in a network?
When connecting a host to a switch.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
UDP
The MAC protocol can be very simple.

26. During encapsulation - what happens in the Data Link Layer?
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
The physical address is added.
IP Protocol
Network portion

27. What causes crosstalk within cable pairs when using UTP?
The magnetic field around the adjacent pairs of wire.
A. hot keys b. context-sensitive c. command syntax check
IP is not properly installed
Rollover cable

28. 3 properties of peer-2-peer applications
They must wait until the first hosts finish transfering the media.
Flash
A. MTA b. SMTP
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

29. What is a protocol that provides connectionless network layer services?
DNS
IP Protocol
To prevent the receiver from being overwhelmed by incoming data.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

30. 3 statements about routes and their use
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
Rollover cable
Hub
Minimal delays in data delivery.

31. When a network service fails - which port is most often used to access a router for management purposes?
Twisting of the cables
Console
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
Minimal delays in data delivery.

32. Given IP 172.16.134.64 and S/M 255.255.255.224 - this IP is an...?
A. addressing b. error detection c. frame delimiting
No collisions will occur on this link.
The magnetic field around the adjacent pairs of wire.
Network address

33. statements of IP adressing
OTDR
A backbone cable.
Next-Hop 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

34. If you have a small network w/ 3 computers...
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
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
Create signals that represent the bits in each frame for the media.
Logical Link Control sublayer

35. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
Supports error detection.
It provides for the exchange of data over a common local media.
A. DB 60 b. Winchester 15-pin c. smart serial

36. What do the intermediary devices in the network do?
A. flow control b. session establishment c. numbering and sequencing
A. DB 60 b. Winchester 15-pin c. smart serial
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Window Size

37. What is the purpose of the TCP/IP Network Application Layer?
A. copper UTP b. optical fiber
A. addressing b. error detection c. frame delimiting
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
Network Media Control

38. What is a drawback of the CSMA/CD access method?
A. Physical b. Data Link
Router(config)# interface FastEthernet 0/1
Collisions can decrease network performance.
Show Interfaces

39. During a TCP session - if packets arrive out of order - what will happen?
Rollover cable
A. goodput b. throughput c. bandwidth
The packets will be delivered and reassembled at destination.
Time-to-live (TTL)

40. 3 protocols that operate in the application layer
A. DNS b. SMTP c. POP
IP is not properly installed
A. addressing b. error detection c. frame delimiting
Destination Network Address

41. 2 characteristics of clients in data networks
Next-Hop Address
A. they initiate data exchanges b. they may upload data to servers
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Wireless

42. 2 characteristics of peer-2-peer
A default gateway (router).
When connecting a host to a switch.
Destination Network Address
A. decentralized resources b. resource sharing w/o a dedicated server

43. Statements that describe LAN
A backbone cable.
Originate data flow.
OTDR
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. There are too many broadcasts on switches - what can be done?
SSH
A. Physical b. Data Link
A. replace a switch w/ a router b. subnet the new networks
Application Layer

45. What is a characteristic of a single-mode fiber-optic cable?
It uses lasers as the light source.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
Network Media Control
A physical topology.

46. What is the primary rope of the physical layer in transmitting data?
Create signals that represent the bits in each frame for the media.
SMB
Hub
The address of the router that the host will use to 'get to the other side'.

47. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
A. goodput b. throughput c. bandwidth
Destination Network Address
A default gateway (router).
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. What do end devices do?
Ctrl + Shift + 6
0 to 1023
Originate data flow.
A. addressing b. error detection c. frame delimiting

49. What is an effect of improperly applying a network cable connector?
Rollover cable
Network Access
Binary ANDing
Signal loss can be experienced.

50. There are 4 different hosts connected to a hub - media is being transfered between 2 of them but the other 2 will also like to transfer media. What must the latest hosts do to transfer the media?
They must wait until the first hosts finish transfering the media.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. decentralized resources b. resource sharing w/o a dedicated server