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CCNA - 2

Instructions:

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. 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?
Fiber
It uses support from the lower layers to distinguish between connections to the service.
8
Console interface

2. Which portion of the network layer address does a router use to forward packets?
Application Layer
Network portion
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. physical layer b. DLL layer

3. 3 terms that define the forms of help available within the Cisco IOS
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
Console
A. hot keys b. context-sensitive c. command syntax check

4. 3 statements of media acess control
A. hot keys b. context-sensitive c. command syntax check
255.255.255.0
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
32 bits

5. Which 2 options represent Layer 4 addressing?
Next-Hop Address
It reduces unnecessary broadcasts.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
Fiber

6. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
A. low overhead b. connectionless
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. hot keys b. context-sensitive c. command syntax check
Destination Network Address

7. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Hosts return to listen-before-transmit mode.
Collisions can decrease network performance.
Originate data flow.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected

8. What correctly describes a MAC address?
Window Size
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
RJ-45
MAC

9. In business LANs - which connector is used w/ twisted-pair networking cable?
RJ-45
A. physical layer b. DLL layer
TCP initializes the sequence numbers for the sessions.
Host mobility

10. What is the role of the OSI Application Layer?
It provides interface between applications on either end of the network.
Hub
Wireless
Is a layer of specific encapsulation.

11. Which OSI model layer is responsible for regulating the flow of information from source to destination - reliably and accurately?
The packets will be delivered and reassembled at destination.
Resolve IPv4 addresses to MAC addresses.
Transport
A physical topology.

12. Network Protocols
They must wait until the first hosts finish transfering the media.
The MAC protocol can be very simple.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. copper UTP b. optical fiber

13. What are 3 pieces of info about a route contained in a routing table?
Signal loss can be experienced.
A. next-hop b. metric/interface c. destination network address
Rollover cable
As the commands are entered.

14. What statements describe the logical token-passing topology?
FTP
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
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

15. What is the function of the DLL?
A. goodput b. throughput c. bandwidth
It provides for the exchange of data over a common local media.
A. not affected by EMI of RFI b. most expensive type of LAN cabling
Resolve IPv4 addresses to MAC addresses.

16. Where is the IOS file stored at?
Flash
A. Physical b. Data Link
TCP initializes the sequence numbers for the sessions.
Rollover cable

17. 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 has expanded adressing capabilities.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
2046
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

18. 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
It provides for the exchange of data over a common local media.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Minimal delays in data delivery.

19. What are 2 layers of the OSI model that have the same functions as 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
A. performance degradation b. security issues c. host identification
A. servers b. routers c. network printers
A. Physical b. Data Link

20. 2 characteristics of peer-2-peer
Is used by the server to resolve names.
A. decentralized resources b. resource sharing w/o a dedicated server
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Wireless

21. Intermediary devices used to implement security between networks
A. router b. firewall
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. enable mode b. priviledge executive mode
Hosts return to listen-before-transmit mode.

22. What are the advantages of using a client-server model?
OTDR
Network address
The packets will be delivered and reassembled at destination.
A. it has centralized administration b. security is easier to enforce

23. Statements that describe LAN
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. identifies the communicating applications b. identifies multiple conversations between the hosts
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
TCP initializes the sequence numbers for the sessions.

24. What layer encapsulates segments into packets?
Network Layer
As the commands are entered.
Router(config)# hostname Costas
A. larger address space b. data types and classes of service c. authentication and encryption

25. What is the purpose of a default gateway?
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Identify the device that allows local network computers to communicate w/ devices in other networks.
No collisions will occur on this link.
FTP

26. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
Identify the device that allows local network computers to communicate w/ devices in other networks.
Physical
Twisting of the cables
To facilitate the entry and exit of data on media.

27. What are key considering factors when grouping hosts into common networks?
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. purpose b. geographic location c. ownership
It does not support encryption.
Rollover cable

28. What is the primary purpose of ARP?
SMB
A. netstat -r b. route PRINT
Resolve IPv4 addresses to MAC addresses.
TCP initializes the sequence numbers for the sessions.

29. What is the role of MTA in handling email?
Originate data flow.
It provides interface between applications on either end of the network.
FTP
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery

30. What is the purpose of the preamble in an ethernet frame?
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
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. hot keys b. context-sensitive c. command syntax check

31. 3 features that allow TCP to realibly and accurately track the transmission of data
A. flow control b. session establishment c. numbering and sequencing
The packets will be delivered and reassembled at destination.
Binary ANDing
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

32. What is a disadvantage of Telnet?
Hosts return to listen-before-transmit mode.
It provides interface between applications on either end of the network.
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
It does not support encryption.

33. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
RJ-45
Network Layer Packet
Host A
The destination host address.

34. What do you need to use for an initial configuration on a Cisco router?
SMB
Console interface
A. the router will discard the packet b. the router will send a time exceeded message to the source host
A. application b. presentation c. session d. transmision e. network f. data link g. physical

35. What kind of problems are caused by excessive broadcast traffic on network segments?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Ctrl + Shift + 6
Supports error detection.
Logical Link Control sublayer

36. A company is planning to subnet a network w/ 27 hosts. What would be the subnet mask used for this?
255.255.255.224
A physical topology.
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Resolve IPv4 addresses to MAC addresses.

37. What are 2 protocols for transfering web resources?
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. router b. firewall
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. HTTP b. HTTPS

38. If there is a graphic representation of a company network wiring and equipment - What is this called?
It provides interface between applications on either end of the network.
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A physical topology.
Host mobility

39. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
A. enable mode b. priviledge executive mode
It provides for the exchange of data over a common local media.
When connecting a host to a switch.
Twisting of the cables

40. What is an automated service that matches resource names w/ required IP addresses?
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
DNS

41. In a connectionless system - What is correct?
UTP
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.
Any device whose backoff timer expires first.

42. At which layer of the TCP/IP model does ethernet operate?
Network Access
The address of the router that the host will use to 'get to the other side'.
Identify processes or services that are communicating with end devices.
A. servers b. routers c. network printers

43. Why are port numbers included in the TCP header of a segment?
A backbone cable.
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
To enable a receiving host to forward the data to the appropriate application.
Window Size

44. 3 statements about the role of routers in the network
The packets will be delivered and reassembled at destination.
80 (HTTP)
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
Wireless

45. During encapsulation - what happens in the Data Link Layer?
Supports error detection.
Identify processes or services that are communicating with end devices.
Network Access
The physical address is added.

46. What do the intermediary devices in the network do?
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
The packets will be delivered and reassembled at destination.
Router
Is a layer of specific encapsulation.

47. What is a component of a routing table entry?
Next-Hop Address
The destination host address.
When connecting a host to a switch.
Switch

48. 3 features of IPv6
Ctrl + Shift + 6
Router
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. larger address space b. data types and classes of service c. authentication and encryption

49. How does the application layer on a server process multiple client requests for services?
SMB
It uses support from the lower layers to distinguish between connections to the service.
A. non-deterministic b. less overhead c. collisions exist
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

50. How many bits make up an IPv4 address?
The address of the router that the host will use to 'get to the other side'.
The magnetic field around the adjacent pairs of wire.
IP Protocol
32 bits

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CCNA - 2

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