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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 random delay helps prevent the stations from experiencing another collision during transmission.
Router
Source Port

2. How many bits make up an IPv4 address?
A. decentralized resources b. resource sharing w/o a dedicated server
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
Is used by the server to resolve names.
32 bits

3. Important characteristic of UDP
Minimal delays in data delivery.
Is a layer of specific encapsulation.
To prevent the receiver from being overwhelmed by incoming data.
Host A

4. What kind of problems are caused by excessive broadcast traffic on network segments?
A random delay helps prevent the stations from experiencing another collision during transmission.
The destination host address.
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Static

5. 3 measures of data transfer
Physical
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. netstat -r b. route PRINT
A. goodput b. throughput c. bandwidth

6. What does the IEEE 802.2 standard represent in Ethernet technologies?
Logical Link Control sublayer
The address of the router that the host will use to 'get to the other side'.
No collisions will occur on this link.
2046

7. Which layer supplies services and allows user interface?
Any device whose backoff timer expires first.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Application Layer
It provides for the exchange of data over a common local media.

8. What makes fiber preferable to copper for interconnecting buildings?
Time-to-live (TTL)
A. HTTP b. HTTPS
UTP
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

9. 3 facts about the network portion of an IPv4 address
Rollover cable
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
A. not affected by EMI of RFI b. most expensive type of LAN cabling

10. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Source and Destination IP address
Hosts return to listen-before-transmit mode.
8
Network address

11. What device can check for faults - integrity and performance of media?
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A random delay helps prevent the stations from experiencing another collision during transmission.
OTDR
Console

12. When is a straight-through cable used in a network?
When connecting a host to a switch.
Static
Host A
Is a layer of specific encapsulation.

13. 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?
Is a layer of specific encapsulation.
Resolve IPv4 addresses to MAC addresses.
2046
Physical

14. At which layers of the OSI model does ethernet operate?
A. physical layer b. DLL layer
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
Host A

15. What are 2 layers of the OSI model that have the same functions as the TCP/IP Network Application Layer?
A. Physical b. Data Link
Signal loss can be experienced.
A. flow control b. session establishment c. numbering and sequencing
Flash

16. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
IP is not properly installed
Next-Hop Address
A. servers b. routers c. network printers
A. low overhead b. connectionless

17. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
FTP
Flash
A. low overhead b. connectionless
UDP

18. What is the primary purpose of Layer 4?
Identify processes or services that are communicating with end devices.
A. the router will discard the packet b. the router will send a time exceeded message to the source host
It uses lasers as the light source.
Network portion

19. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
A. media sharing b. logical topology
A. identifies the communicating applications b. identifies multiple conversations between the hosts
It reduces unnecessary broadcasts.
Network Layer Packet

20. What correctly describes a MAC address?
Resolve IPv4 addresses to MAC addresses.
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
UTP
Hosts return to listen-before-transmit mode.

21. In a connectionless system - What is correct?
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
Destination is not contacted before a packet is sent.
A. non-deterministic b. less overhead c. collisions exist
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

22. 3 properties of peer-2-peer applications
When connecting a host to a switch.
Transport
Physical
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

23. What are 3 common problems w/ large networks?
Hub
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. perform degradation b. security issues c. host identification

24. What is a component of a routing table entry?
SMB
Next-Hop Address
Twisting of the cables
It reduces unnecessary broadcasts.

25. What are 3 properties of contention-based media access for a shared media?
A. goodput b. throughput c. bandwidth
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. non-deterministic b. less overhead c. collisions exist
Fiber

26. 2 functions of encapsulation
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. not affected by EMI of RFI b. most expensive type of LAN cabling
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. show startup-config b. show running-config

27. At which layer of the TCP/IP model does ethernet operate?
It has expanded adressing capabilities.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Router
Network Access

28. What is the role of MTA in handling email?
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
A. netstat -r b. route PRINT
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery

29. What process routers use to determine the subnet network address w/ an IP address and a subnet mask?
The packets will be delivered and reassembled at destination.
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
Router
Binary ANDing

30. What is the purpose of resource records in DNS?
A. physical layer b. DLL layer
Twisting of the cables
Is used by the server to resolve names.
Hub

31. Statements that describe LAN
Destination is not contacted before a packet is sent.
To prevent the receiver from being overwhelmed by incoming data.
Is used by the server to resolve names.
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)

32. 3 statements about routes and their use
Destination is not contacted before a packet is sent.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
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. the router will discard the packet b. the router will send a time exceeded message to the source host

33. What is a characteristic of a single-mode fiber-optic cable?
The destination host address.
A. purpose b. geographic location c. ownership
Supports error detection.
It uses lasers as the light source.

34. 3 common problems w/ a large network
A. physical layer b. DLL layer
SMB
A. performance degradation b. security issues c. host identification
OTDR

35. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
Router(config)# hostname Costas
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
Fiber
0 to 1023

36. What is the role of the OSI Application Layer?
A default gateway (router).
It provides interface between applications on either end of the network.
Hosts return to listen-before-transmit mode.
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

37. 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?
Supports error detection.
8
Host A
2046

38. 2 characteristics of clients in data networks
It provides interface between applications on either end of the network.
A. they initiate data exchanges b. they may upload data to servers
IP is not properly installed
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

39. What command can be used to determine if the router has experienced any input or output errors?
A. router b. firewall
Wireless
The physical address is added.
Show Interfaces

40. What are 3 pieces of info about a route contained in a routing table?
Source Port
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. next-hop b. metric/interface c. destination network address
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long

41. What is the purpose of the TCP/IP Network Application Layer?
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
It does not support encryption.
Network Media Control
Next-Hop Address

42. What is the primary purpose of ARP?
Resolve IPv4 addresses to MAC addresses.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
A. it has centralized administration b. security is easier to enforce
OTDR

43. 3 characteristics of valid Ethernet Layer 2 addresses
It does not support encryption.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Console interface
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected

44. What information is added during encapsulation at OSI Layer 3?
The MAC protocol can be very simple.
A. DB 60 b. Winchester 15-pin c. smart serial
A. they initiate data exchanges b. they may upload data to servers
Source and Destination IP address

45. What can be a problem that is reduced by adding end-to-end addressing?
IP is not properly installed
A. perform degradation b. security issues c. host identification
It reduces unnecessary broadcasts.
A physical topology.

46. What command is used to change the default name to 'Costas'?
To prevent the receiver from being overwhelmed by incoming data.
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Hosts return to listen-before-transmit mode.
Router(config)# hostname Costas

47. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
It uses support from the lower layers to distinguish between connections to the service.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
8

48. What do end devices do?
The destination host address.
A. copper UTP b. optical fiber
Originate data flow.
UDP

49. What is a protocol that provides connectionless network layer services?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
IP Protocol
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.

50. When destination network is not in the routing table - What are 2 actions the router might take?
A. router b. firewall
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Next-Hop Address
Any device whose backoff timer expires first.