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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. What describes the purpose of default route?
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. router b. firewall
IP Protocol
Destination Network Address

2. What are 2 layers of the OSI model that have the same functions as the TCP/IP Network Application Layer?
It uses support from the lower layers to distinguish between connections to the service.
A. Physical b. Data Link
To prevent the receiver from being overwhelmed by incoming data.
SSH

3. Why is flow control used for TCP data transfer?
RJ-45
A. performance degradation b. security issues c. host identification
Is used by the server to resolve names.
To prevent the receiver from being overwhelmed by incoming data.

4. What kind of problems are caused by excessive broadcast traffic on network segments?
0 to 1023
A. decentralized resources b. resource sharing w/o a dedicated server
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. enable mode b. priviledge executive mode

5. What is the proper order of the OSI Layers?
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Network portion
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

6. What is the primary purpose of ARP?
A. next-hop b. metric/interface c. destination network address
A. they initiate data exchanges b. they may upload data to servers
Resolve IPv4 addresses to MAC addresses.
Transport

7. What information is added during encapsulation at OSI Layer 3?
A. non-deterministic b. less overhead c. collisions exist
Source and Destination IP address
Resolve IPv4 addresses to MAC addresses.
To facilitate the entry and exit of data on media.

8. What is a characteristic of a logical point-to-point topology?
The MAC protocol can be very simple.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
The packets will be delivered and reassembled at destination.
IP is not properly installed

9. What command will you use to place the router into the correct mode to configure an appropiate interface to connect a LAN?
Source and Destination Ports
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Router(config)# interface FastEthernet 0/1
A. low overhead b. connectionless

10. During a TCP session - if packets arrive out of order - what will happen?
The packets will be delivered and reassembled at destination.
A. purpose b. geographic location c. ownership
MAC
As the commands are entered.

11. What process routers use to determine the subnet network address w/ an IP address and a subnet mask?
Binary ANDing
The destination host address.
To enable a receiving host to forward the data to the appropriate application.
255.255.255.224

12. What is the role of MTA in handling email?
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A random delay helps prevent the stations from experiencing another collision during transmission.
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery

13. 3 statements about the role of routers in the network
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. Cat5 UTP b. Cat6 UTP
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A. the router will discard the packet b. the router will send a time exceeded message to the source host

14. What is an effect of improperly applying a network cable connector?
A. physical layer b. DLL layer
Signal loss can be experienced.
A. hot keys b. context-sensitive c. command syntax check
Network Access

15. There are too many broadcasts on switches - what can be done?
A. it has centralized administration b. security is easier to enforce
A. DNS b. SMTP c. POP
Identify processes or services that are communicating with end devices.
A. replace a switch w/ a router b. subnet the new networks

16. 3 features of IPv6
A. larger address space b. data types and classes of service c. authentication and encryption
Network Layer Packet
A random delay helps prevent the stations from experiencing another collision during transmission.
A. Physical b. Data Link

17. What is an automated service that matches resource names w/ required IP addresses?
Minimal delays in data delivery.
80 (HTTP)
DNS
Switch

18. What is the purpose of the preamble in an ethernet frame?
Collisions can decrease network performance.
A. the router will discard the packet b. the router will send a time exceeded message to the source host
A. addressing b. error detection c. frame delimiting
It is used for timing synchronization w/ alternating patterns of 1s and 0s.

19. To make a console connection from a comp to a Cisco router - what cable should be used?
Rollover cable
Supports error detection.
A physical topology.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected

20. What are 3 pieces of info about a route contained in a routing table?
A. non-deterministic b. less overhead c. collisions exist
Time-to-live (TTL)
Network Layer
A. next-hop b. metric/interface c. destination network address

21. Which IP packet field will prevent endless loops?
The magnetic field around the adjacent pairs of wire.
Time-to-live (TTL)
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
DNS

22. 3 statements about routes and their use
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Source Port
As the commands are entered.
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

23. Given IP 172.16.134.64 and S/M 255.255.255.224 - this IP is an...?
Is used by the server to resolve names.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Network address
A. flow control b. session establishment c. numbering and sequencing

24. 3 features that allow TCP to realibly and accurately track the transmission of data
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
Is used by the server to resolve names.
A. flow control b. session establishment c. numbering and sequencing
It does not support encryption.

25. 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?
It reduces unnecessary broadcasts.
A. router b. firewall
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
8

26. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
Static
Router
Physical
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.

27. 2 functions of encapsulation
A. performance 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
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. larger address space b. data types and classes of service c. authentication and encryption

28. What correctly describes a MAC address?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
Twisting of the cables
IP is not properly installed
Network Layer

29. 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?
Console
Network
2046
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

30. 3 measures of data transfer
Source and Destination Ports
A. larger address space b. data types and classes of service c. authentication and encryption
A. show startup-config b. show running-config
A. goodput b. throughput c. bandwidth

31. If you have a small network w/ 3 computers...
To enable a receiving host to forward the data to the appropriate application.
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
Any device whose backoff timer expires first.
A. purpose b. geographic location c. ownership

32. 3 primary functions of the data link layer encapsulation
255.255.255.224
A. addressing b. error detection c. frame delimiting
A. application b. services
Rollover cable

33. What command can be used to determine if the router has experienced any input or output errors?
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Network portion
Show Interfaces
2046

34. What is the primary function of encapsulating packets into frames?
MAC
To facilitate the entry and exit of data on media.
No collisions will occur on this link.
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected

35. What is the purpose of resource records in DNS?
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
A physical topology.
Is used by the server to resolve names.
Is a layer of specific encapsulation.

36. 3 characteristics of valid Ethernet Layer 2 addresses
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. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A. identifies the communicating applications b. identifies multiple conversations between the hosts

37. During encapsulation - what happens in the Data Link Layer?
A. addressing b. error detection c. frame delimiting
The physical address is added.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A backbone cable.

38. 2 most commonly used media types in ethernet networks
A. purpose b. geographic location c. ownership
Hosts return to listen-before-transmit mode.
A. non-deterministic b. less overhead c. collisions exist
A. copper UTP b. optical fiber

39. 2 characteristics of clients in data networks
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. they initiate data exchanges b. they may upload data to servers
To prevent the receiver from being overwhelmed by incoming data.
IP is not properly installed

40. How many bits make up an IPv4 address?
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
32 bits
A. performance degradation b. security issues c. host identification
Network address

41. Which layer supplies services and allows user interface?
Application Layer
Destination Network Address
Any device whose backoff timer expires first.
Identify the device that allows local network computers to communicate w/ devices in other networks.

42. A company is planning to subnet a network w/ 27 hosts. What would be the subnet mask used for this?
A. servers b. routers c. network printers
A. enable mode b. priviledge executive mode
255.255.255.224
A. it has centralized administration b. security is easier to enforce

43. What device can check for faults - integrity and performance of media?
OTDR
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Show Interfaces

44. In a connectionless system - What is correct?
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. enable mode b. priviledge executive mode
Destination is not contacted before a packet is sent.
Wireless

45. After a routers ends its boot sequence - the admin wants to check the routers config. From the EXEC mode - which commands can the admin use?
Network Media Control
Transport
A. show startup-config b. show running-config
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

46. 3 statements of media acess control
Hub
Router
Logical Link Control sublayer
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

47. What is the primary purpose of Layer 4?
Identify processes or services that are communicating with end devices.
A default gateway (router).
Rollover cable
Collisions can decrease network performance.

48. What are 3 common problems w/ large networks?
A. perform degradation b. security issues c. host identification
A. addressing b. error detection c. frame delimiting
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
No collisions will occur on this link.

49. If there is a graphic representation of a company network wiring and equipment - What is this called?
Network portion
172.16.192.160
UTP
A physical topology.

50. What are key considering factors when grouping hosts into common networks?
A. addressing b. error detection c. frame delimiting
A. purpose b. geographic location c. ownership
To enable a receiving host to forward the data to the appropriate application.
A physical topology.

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CCNA - 2

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