Test your basic knowledge |

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. Why is flow control used for TCP data transfer?
The packets will be delivered and reassembled at destination.
To prevent the receiver from being overwhelmed by incoming data.
SSH
A. non-deterministic b. less overhead c. collisions exist

2. What can be a problem that is reduced by adding end-to-end addressing?
It reduces unnecessary broadcasts.
It has expanded adressing capabilities.
When connecting a host to a switch.
It uses lasers as the light source.

3. 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
Hub
Is used by the server to resolve names.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

4. What is the purpose of the TCP/IP Network Application Layer?
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
Network Media Control
Destination Network Address
A. netstat -r b. route PRINT

5. What application layer protocol is used to support file transfers between client and server?
A. show startup-config b. show running-config
FTP
Console interface
Is a layer of specific encapsulation.

6. 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.
Source and Destination Ports
Ctrl + Shift + 6
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

7. What is the purpose of a default gateway?
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
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Signal loss can be experienced.
Identify the device that allows local network computers to communicate w/ devices in other networks.

8. Which characteristics describe fiber optic cable?
A. MTA b. SMTP
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. not affected by EMI of RFI b. most expensive type of LAN cabling
Destination is not contacted before a packet is sent.

9. What is a component of a routing table entry?
Next-Hop Address
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
Create signals that represent the bits in each frame for the media.

10. What is the role of the OSI Application Layer?
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
It provides interface between applications on either end of the network.
MAC
A random delay helps prevent the stations from experiencing another collision during transmission.

11. What are 2 features of User Diagram Protocol (UDP)?
0 to 1023
It uses support from the lower layers to distinguish between connections to the service.
The destination host address.
A. low overhead b. connectionless

12. There are too many broadcasts on switches - what can be done?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
IP Protocol
Network portion
A. replace a switch w/ a router b. subnet the new networks

13. Which combination of keys can be used to interrupt a ping or traceroute process?
A random delay helps prevent the stations from experiencing another collision during transmission.
Ctrl + Shift + 6
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Resolve IPv4 addresses to MAC addresses.

14. What kind of problems are caused by excessive broadcast traffic on network segments?
A default gateway (router).
OTDR
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. it has centralized administration b. security is easier to enforce

15. When do changes take effect in a Cisco router?
As the commands are entered.
Network portion
Network Layer Packet
A. media sharing b. logical topology

16. What is the purpose of the preamble in an ethernet frame?
Destination Network Address
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. netstat -r b. route PRINT
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

17. 3 measures of data transfer
A. goodput b. throughput c. bandwidth
Host mobility
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
It reduces unnecessary broadcasts.

18. What is dinamically selected by the source host when forwarding data?
Network address
A physical topology.
To prevent the receiver from being overwhelmed by incoming data.
Source Port

19. What is the purpose of resource records in DNS?
Is used by the server to resolve names.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
SMB
To enable a receiving host to forward the data to the appropriate application.

20. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
255.255.255.0
A. flow control b. session establishment c. numbering and sequencing
Switch
Static

21. At which layers of the OSI model does ethernet operate?
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. physical layer b. DLL layer
OTDR
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

22. If you have a full-duplex operational network - what can happen?
A. netstat -r b. route PRINT
A. MTA b. SMTP
Resolve IPv4 addresses to MAC addresses.
No collisions will occur on this link.

23. 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
Identify the device that allows local network computers to communicate w/ devices in other networks.
Collisions can decrease network performance.
It reduces unnecessary broadcasts.

24. What 2 type of cables would most commonly be used for new runs?
A. Cat5 UTP b. Cat6 UTP
A. minimizing of collisions b. division into broadcast domains
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Window Size

25. After an ethernet collision - which device has priority to transmit data?
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
A. they initiate data exchanges b. they may upload data to servers
Any device whose backoff timer expires first.
Identify the device that allows local network computers to communicate w/ devices in other networks.

26. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
Network Layer Packet
255.255.255.224
A. low overhead b. connectionless
Console interface

27. During encapsulation - what happens in the Data Link Layer?
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
The physical address is added.
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
A default gateway (router).

28. What type of routing uses information that is manually entered into the routing table?
A. show startup-config b. show running-config
A. media sharing b. logical topology
Static
As the commands are entered.

29. What are 3 properties of contention-based media access for a shared media?
A. non-deterministic b. less overhead c. collisions exist
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
A. flow control b. session establishment c. numbering and sequencing
It reduces unnecessary broadcasts.

30. A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?
A. minimizing of collisions b. division into broadcast domains
Application Layer
172.16.192.160
A. router b. firewall

31. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
32 bits
A. goodput b. throughput c. bandwidth
A. enable mode b. priviledge executive mode
Destination is not contacted before a packet is sent.

32. What is PDU?
Is a layer of specific encapsulation.
A. not affected by EMI of RFI b. most expensive type of LAN cabling
Console interface
A default gateway (router).

33. What causes crosstalk within cable pairs when using UTP?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
Flash
Network
The magnetic field around the adjacent pairs of wire.

34. What is a benefit of a WAN?
Host mobility
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. application b. presentation c. session d. transmision e. network f. data link g. physical
Flash

35. What does the IEEE 802.2 standard represent in Ethernet technologies?
FTP
Logical Link Control sublayer
Show Interfaces
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

36. Why are port numbers included in the TCP header of a segment?
To enable a receiving host to forward the data to the appropriate application.
A. minimizing of collisions b. division into broadcast domains
A backbone cable.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

37. When a device is moved from one network to the other...?
Destination is not contacted before a packet is sent.
A. they initiate data exchanges b. they may upload data to servers
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
Identify processes or services that are communicating with end devices.

38. What connectors are commonly associated w/ Cisco's V.35 serial cables?
Create signals that represent the bits in each frame for the media.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
It reduces unnecessary broadcasts.
A. DB 60 b. Winchester 15-pin c. smart serial

39. An admin wants to evaluate all traffic in a network. To ensure that all packets are captured - what network device should be used?
Network Layer Packet
Is a layer of specific encapsulation.
Console interface
Hub

40. 3 primary functions of the data link layer encapsulation
Identify processes or services that are communicating with end devices.
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. addressing b. error detection c. frame delimiting
A. next-hop b. metric/interface c. destination network address

41. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Supports error detection.
2046
Time-to-live (TTL)
Network

42. 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
Host A
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. HTTP b. HTTPS

43. What can you identify when you examine the Network Layer header?
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
The destination host address.
Destination Network Address
Minimal delays in data delivery.

44. 3 characteristics of valid Ethernet Layer 2 addresses
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Source and Destination IP address
A. DB 60 b. Winchester 15-pin c. smart serial
When connecting a host to a switch.

45. Which type of cable is most often associated w/ fiber-optic cable?
Destination Network Address
255.255.255.224
The destination host address.
A backbone cable.

46. What process routers use to determine the subnet network address w/ an IP address and a subnet mask?
A. show startup-config b. show running-config
A. minimizing of collisions b. division into broadcast domains
Binary ANDing
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. What are 2 forms of application layer software?
A. application b. services
A. minimizing of collisions b. division into broadcast domains
Console
A. perform degradation b. security issues c. host identification

48. What device can check for faults - integrity and performance of media?
2046
OTDR
A. performance degradation b. security issues c. host identification
Originate data flow.

49. What command is used to change the default name to 'Costas'?
Router(config)# hostname Costas
2046
A. netstat -r b. route PRINT
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

50. After a browser makes a request to a web server in the standard port - what will be the port number in the TCP header?
A physical topology.
A. netstat -r b. route PRINT
80 (HTTP)
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format