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CCNA - 2

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
A. they initiate data exchanges b. they may upload data to servers
UDP
A. low overhead b. connectionless
2046

2. How does the application layer on a server process multiple client requests for services?
It uses support from the lower layers to distinguish between connections to the service.
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
MAC
Is a layer of specific encapsulation.

3. 3 statements about routes and their use
Console
Destination is not contacted before a packet is sent.
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
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

4. 3 terms that define the forms of help available within the Cisco IOS
A. hot keys b. context-sensitive c. command syntax check
Static
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
The destination host address.

5. What is the primary purpose of Layer 4?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Identify processes or services that are communicating with end devices.
Binary ANDing
A. media sharing b. logical topology

6. 2 characteristics of peer-2-peer
A. addressing b. error detection c. frame delimiting
A. decentralized resources b. resource sharing w/o a dedicated server
Physical
Supports error detection.

7. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
Network Media Control
A default gateway (router).
Window Size
A. router b. firewall

8. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Source Port
A. goodput b. throughput c. bandwidth
Supports error detection.
Static

9. An admin wants to evaluate all traffic in a network. To ensure that all packets are captured - what network device should be used?
Hub
Static
A. low overhead b. connectionless
Host mobility

10. Which type of cable is most often associated w/ fiber-optic cable?
A. hot keys b. context-sensitive c. command syntax check
Transport
A backbone cable.
Supports error detection.

11. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
It uses lasers as the light source.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Is used by the server to resolve names.
A. it has centralized administration b. security is easier to enforce

12. Important characteristic of UDP
The address of the router that the host will use to 'get to the other side'.
Flash
Minimal delays in data delivery.
A. HTTP b. HTTPS

13. What are 2 features of User Diagram Protocol (UDP)?
MAC
A. physical layer b. DLL layer
Router(config)# hostname Costas
A. low overhead b. connectionless

14. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
To facilitate the entry and exit of data on media.
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
255.255.255.0
No collisions will occur on this link.

15. What is a disadvantage of Telnet?
Network
Destination is not contacted before a packet is sent.
MAC
It does not support encryption.

16. 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?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
DNS
UDP
Host A

17. What is the role of the OSI Application Layer?
Network
Switch
Window Size
It provides interface between applications on either end of the network.

18. What are 2 email components used to forward mail between servers?
A. MTA b. SMTP
A. performance degradation b. security issues c. host identification
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
A. minimizing of collisions b. division into broadcast domains

19. What is the primary rope of the physical layer in transmitting data?
Create signals that represent the bits in each frame for the media.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A. decentralized resources b. resource sharing w/o a dedicated server
2046

20. What characteristic of an UTP helps reduce interference?
Twisting of the cables
A. hot keys b. context-sensitive c. command syntax check
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Network portion

21. What is dinamically selected by the source host when forwarding data?
Console
Source Port
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
Supports error detection.

22. A company is planning to subnet a network w/ 27 hosts. What would be the subnet mask used for this?
255.255.255.224
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
IP Protocol
A. show startup-config b. show running-config

23. 3 statements of media acess control
To prevent the receiver from being overwhelmed by incoming data.
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
It provides interface between applications on either end of the network.
Is used by the server to resolve names.

24. 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?
A. flow control b. session establishment c. numbering and sequencing
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
2046
Rollover cable

25. What is the primary purpose of ARP?
The packets will be delivered and reassembled at destination.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Resolve IPv4 addresses to MAC addresses.
Console

26. What is a drawback of the CSMA/CD access method?
The address of the router that the host will use to 'get to the other side'.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A backbone cable.
Collisions can decrease network performance.

27. What is an automated service that matches resource names w/ required IP addresses?
A. it has centralized administration b. security is easier to enforce
DNS
A. show startup-config b. show running-config
Originate data flow.

28. Statements that describe LAN
A. application b. services
To prevent the receiver from being overwhelmed by incoming data.
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. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long

29. What are the advantages of using a client-server model?
A. router b. firewall
A. it has centralized administration b. security is easier to enforce
A. performance degradation b. security issues c. host identification
Network address

30. 3 functions of the upper data link sublayer in the OSI model
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
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
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

31. What is the role of MTA in handling email?
Logical Link Control sublayer
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
It provides for the exchange of data over a common local media.
Create signals that represent the bits in each frame for the media.

32. What are 3 properties of contention-based media access for a shared media?
0 to 1023
A. non-deterministic b. less overhead c. collisions exist
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry

33. What kind of problems are caused by excessive broadcast traffic on network segments?
A. HTTP b. HTTPS
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Router
Flash

34. 3 features that allow TCP to realibly and accurately track the transmission of data
UTP
A. flow control b. session establishment c. numbering and sequencing
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
Host A

35. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
A. hot keys b. context-sensitive c. command syntax check
No collisions will occur on this link.
Time-to-live (TTL)
A. enable mode b. priviledge executive mode

36. What are 3 common problems w/ large networks?
A. the router will discard the packet b. the router will send a time exceeded message to the source host
A. perform degradation b. security issues c. host identification
A. Physical b. Data Link
It has expanded adressing capabilities.

37. What is a characteristic of a logical point-to-point topology?
The MAC protocol can be very simple.
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
Network Media Control
It reduces unnecessary broadcasts.

38. 3 factors that should be considered when implementing Layer 2 protocols
Collisions can decrease network performance.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
DNS
They must wait until the first hosts finish transfering the media.

39. 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?
A. perform degradation b. security issues c. host identification
A. they initiate data exchanges b. they may upload data to servers
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
They must wait until the first hosts finish transfering the media.

40. What do end devices do?
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.
Originate data flow.
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

41. What type of routing uses information that is manually entered into the routing table?
A. it has centralized administration b. security is easier to enforce
IP Protocol
MAC
Static

42. Group of hosts that have identical bit patterns in the high order bits of their addresses
The magnetic field around the adjacent pairs of wire.
Fiber
It has expanded adressing capabilities.
Network

43. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
A. flow control b. session establishment c. numbering and sequencing
SSH
IP is not properly installed
It provides for the exchange of data over a common local media.

44. Where is the IOS file stored at?
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. it has centralized administration b. security is easier to enforce
A. flow control b. session establishment c. numbering and sequencing
Flash

45. 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
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Console interface
Is used by the server to resolve names.

46. 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
Wireless
Network portion
A default gateway (router).

47. When is a straight-through cable used in a network?
When connecting a host to a switch.
A. next-hop b. metric/interface c. destination network 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
A. hot keys b. context-sensitive c. command syntax check

48. What is the purpose of resource records in DNS?
Host A
Destination Network Address
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Is used by the server to resolve names.

49. What makes fiber preferable to copper for interconnecting buildings?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
255.255.255.0
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

50. An admin needs to keep contents private - which access method should he use?
SSH
Minimal delays in data delivery.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
Network address

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CCNA - 2

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