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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 business LANs - which connector is used w/ twisted-pair networking cable?
The physical address is added.
It provides for the exchange of data over a common local media.
A. copper UTP b. optical fiber
RJ-45

2. What is an automated service that matches resource names w/ required IP addresses?
DNS
Supports error detection.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. performance degradation b. security issues c. host identification

3. What method of signal transmission uses radio waves to carry signals?
Wireless
Transport
A. router b. firewall
It does not support encryption.

4. 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
To enable a receiving host to forward the data to the appropriate application.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
A. MTA b. SMTP

5. If host A's DG is 10.0.0.1 and host B's DG is 10.0.0.2 - when the router's IP address is 10.0.0.1. Which one will go through?
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
SMB
Collisions can decrease network performance.
Host A

6. At which layer of the TCP/IP model does ethernet operate?
Time-to-live (TTL)
Network Access
Hub
Fiber

7. 3 features that allow TCP to realibly and accurately track the transmission of data
Originate data flow.
A. performance degradation b. security issues c. host identification
Create signals that represent the bits in each frame for the media.
A. flow control b. session establishment c. numbering and sequencing

8. What describes the purpose of default route?
TCP initializes the sequence numbers for the sessions.
Ctrl + Shift + 6
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

9. An admin needs to keep contents private - which access method should he use?
SSH
IP is not properly installed
A. show startup-config b. show running-config
Host mobility

10. Which device is used to create or divide broadcast domains?
When connecting a host to a switch.
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
172.16.192.160
Router

11. What layer encapsulates segments into packets?
Network Layer
A physical topology.
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
Destination Network Address

12. Which portion of the network layer address does a router use to forward packets?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
Hosts return to listen-before-transmit mode.
Network portion
A. netstat -r b. route PRINT

13. What is the purpose of a default gateway?
Identify processes or services that are communicating with end devices.
A. perform degradation b. security issues c. host identification
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
Identify the device that allows local network computers to communicate w/ devices in other networks.

14. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
Destination Network Address
It has expanded adressing capabilities.
It uses support from the lower layers to distinguish between connections to the service.
The destination host address.

15. 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
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
UDP
As the commands are entered.

16. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
They must wait until the first hosts finish transfering the media.
Hosts return to listen-before-transmit mode.
Supports error detection.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

17. Intermediary devices used to implement security between networks
A. router b. firewall
It does not support encryption.
A. non-deterministic b. less overhead c. collisions exist
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

18. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
Fiber
Hosts return to listen-before-transmit mode.
DNS
A. larger address space b. data types and classes of service c. authentication and encryption

19. What is the purpose of the TCP/IP Network Application Layer?
Network Media Control
32 bits
A. perform degradation b. security issues c. host identification
A. minimizing of collisions b. division into broadcast domains

20. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
UDP

21. What can be a problem that is reduced by adding end-to-end addressing?
Destination is not contacted before a packet is sent.
The address of the router that the host will use to 'get to the other side'.
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
It reduces unnecessary broadcasts.

22. What is an effect of improperly applying a network cable connector?
Is a layer of specific encapsulation.
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
Signal loss can be experienced.
255.255.255.0

23. 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. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
To facilitate the entry and exit of data on media.
Identify the device that allows local network computers to communicate w/ devices in other networks.
8

24. What is the function of the DLL?
Time-to-live (TTL)
A physical topology.
It provides interface between applications on either end of the network.
It provides for the exchange of data over a common local media.

25. Statements that describe LAN
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
Network
As the commands are entered.
It does not support encryption.

26. What are 3 common problems w/ large networks?
A. perform degradation b. security issues c. host identification
Binary ANDing
8
Source Port

27. What is a disadvantage of Telnet?
No collisions will occur on this link.
It does not support encryption.
Twisting of the cables
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

28. When destination network is not in the routing table - What are 2 actions the router might take?
Host A
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
Twisting of the cables

29. During a TCP session - if packets arrive out of order - what will happen?
Signal loss can be experienced.
A. perform degradation b. security issues c. host identification
The packets will be delivered and reassembled at destination.
Physical

30. 3 facts about the network portion of an IPv4 address
Logical Link Control sublayer
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
UDP
A. goodput b. throughput c. bandwidth

31. What information is added during encapsulation at OSI Layer 3?
SSH
Source and Destination IP address
A. physical layer b. DLL layer
Wireless

32. What type of network cable is used between a terminal and a console port?
Rollover cable
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
It uses lasers as the light source.
Resolve IPv4 addresses to MAC addresses.

33. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
Network Access
Destination is not contacted before a packet is sent.
Identify processes or services that are communicating with end devices.
IP is not properly installed

34. Which 2 options represent Layer 4 addressing?
To enable a receiving host to forward the data to the appropriate application.
Application Layer
Any device whose backoff timer expires first.
A. identifies the communicating applications b. identifies multiple conversations between the hosts

35. How many bits make up an IPv4 address?
A. low overhead b. connectionless
A backbone cable.
SMB
32 bits

36. What is the purpose of the preamble in an ethernet frame?
A. perform degradation b. security issues c. host identification
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Supports error detection.
To prevent the receiver from being overwhelmed by incoming data.

37. What statements describe the logical token-passing topology?
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
A. not affected by EMI of RFI b. most expensive type of LAN cabling
Identify the device that allows local network computers to communicate w/ devices in other networks.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.

38. What are 2 features of User Diagram Protocol (UDP)?
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
Host A
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. low overhead b. connectionless

39. 3 common problems w/ a large network
Source and Destination IP address
Show Interfaces
Switch
A. performance degradation b. security issues c. host identification

40. When do changes take effect in a Cisco router?
A. application b. services
Router(config)# interface FastEthernet 0/1
A. copper UTP b. optical fiber
As the commands are entered.

41. When is a straight-through cable used in a network?
Originate data flow.
When connecting a host to a switch.
OTDR
The packets will be delivered and reassembled at destination.

42. Network Protocols
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Rollover cable
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. 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

43. 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?
2046
The address of the router that the host will use to 'get to the other side'.
A. the router will discard the packet b. the router will send a time exceeded message to the source host
A. servers b. routers c. network printers

44. What type of routing uses information that is manually entered into the routing table?
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
IP Protocol
Static
A. netstat -r b. route PRINT

45. 3 statements about the role of routers in the network
A. media sharing b. logical topology
It provides for the exchange of data over a common local media.
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
It provides interface between applications on either end of the network.

46. There are too many broadcasts on switches - what can be done?
A. larger address space b. data types and classes of service c. authentication and encryption
A. replace a switch w/ a router b. subnet the new networks
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
Identify processes or services that are communicating with end devices.

47. What kind of problems are caused by excessive broadcast traffic on network segments?
A. next-hop b. metric/interface c. destination network address
A default gateway (router).
A. application b. services
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

48. What are 3 pieces of info about a route contained in a routing table?
Network portion
Network Access
A. next-hop b. metric/interface c. destination network address
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

49. What are 3 properties of contention-based media access for a shared media?
DNS
Destination Network Address
A. non-deterministic b. less overhead c. collisions exist
Static

50. What is the primary purpose of Layer 4?
Identify processes or services that are communicating with end devices.
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 magnetic field around the adjacent pairs of wire.
A. servers b. routers c. network printers