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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 is the primary funcion of the trailer in the Data Link Layer encapsulation?
A. physical layer b. DLL layer
Supports error detection.
Console interface
A. performance degradation b. security issues c. host identification

2. What is the primary function of encapsulating packets into frames?
Logical Link Control sublayer
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
To facilitate the entry and exit of data on media.
Network Layer

3. What are 2 common characteristics associated w/ dynamic routing protocols?
Is used by the server to resolve names.
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
Network Access

4. What information is added during encapsulation at OSI Layer 3?
Static
Source and Destination IP address
Hosts return to listen-before-transmit mode.
A. Physical b. Data Link

5. What is the primary reason for developing IPv6?
A. replace a switch w/ a router b. subnet the new networks
It has expanded adressing capabilities.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. flow control b. session establishment c. numbering and sequencing

6. What device can check for faults - integrity and performance of media?
OTDR
Physical
They must wait until the first hosts finish transfering the media.
UDP

7. 3 protocols that operate in the 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
A. DNS b. SMTP c. POP
Network Layer Packet
0 to 1023

8. What is the purpose of the TCP/IP Network Application Layer?
Network Media Control
TCP initializes the sequence numbers for the sessions.
Window Size
RJ-45

9. What is the purpose of a default gateway?
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. replace a switch w/ a router b. subnet the new networks
Identify the device that allows local network computers to communicate w/ devices in other networks.
MAC

10. What can be a problem that is reduced by adding end-to-end addressing?
It reduces unnecessary broadcasts.
A. purpose b. geographic location c. ownership
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
Identify processes or services that are communicating with end devices.

11. What process routers use to determine the subnet network address w/ an IP address and a subnet mask?
Binary ANDing
Router(config)# hostname Costas
Identify the device that allows local network computers to communicate w/ devices in other networks.
Source and Destination Ports

12. If you have a small network w/ 3 computers...
Host mobility
A. Cat5 UTP b. Cat6 UTP
A. physical layer b. DLL 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

13. What causes crosstalk within cable pairs when using UTP?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
It does not support encryption.
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
The magnetic field around the adjacent pairs of wire.

14. What are 3 properties of contention-based media access for a shared media?
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
A. application b. services
A physical topology.
A. non-deterministic b. less overhead c. collisions exist

15. What makes fiber preferable to copper for interconnecting buildings?
The magnetic field around the adjacent pairs of wire.
FTP
The destination host address.
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

16. 2 things that will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away
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
255.255.255.224
It does not support encryption.

17. There are too many broadcasts on switches - what can be done?
A. hot keys b. context-sensitive c. command syntax check
A. replace a switch w/ a router b. subnet the new networks
A. addressing b. error detection c. frame delimiting
Network Access

18. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Identify processes or services that are communicating with end devices.
Hosts return to listen-before-transmit mode.
A. copper UTP b. optical fiber
The address of the router that the host will use to 'get to the other side'.

19. An admin needs a media that can run up to 100m in legth. Which type of media would be best?
IP is not properly installed
UTP
Show Interfaces
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other

20. What networking devices are recommended to be assigned static IP addresses?
A. copper UTP b. optical fiber
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. servers b. routers c. network printers
OTDR

21. Default Gateway is incorrect on the host - What is the impact on the communications?
Create signals that represent the bits in each frame for the media.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A. physical layer b. DLL layer
Resolve IPv4 addresses to MAC addresses.

22. During encapsulation - what happens in the Data Link Layer?
A. addressing b. error detection c. frame delimiting
Console
The physical address is added.
Ctrl + Shift + 6

23. What are key considering factors when grouping hosts into common networks?
A. purpose b. geographic location c. ownership
Console interface
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
Transport

24. What characteristic of an UTP helps reduce interference?
They must wait until the first hosts finish transfering the media.
A. replace a switch w/ a router b. subnet the new networks
Twisting of the cables
A. performance degradation b. security issues c. host identification

25. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
A. the router will discard the packet b. the router will send a time exceeded message to the source host
OTDR
Destination Network Address
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1

26. What are 2 layers of the OSI model that have the same functions as 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
The MAC protocol can be very simple.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. Physical b. Data Link

27. What application layer protocol is used to support file transfers between client and server?
FTP
Logical Link Control sublayer
A. DNS b. SMTP c. POP
A. servers b. routers c. network printers

28. When is a straight-through cable used in a network?
When connecting a host to a switch.
A. performance degradation b. security issues c. host identification
A. next-hop b. metric/interface c. destination network address
It uses lasers as the light source.

29. What are 3 pieces of info about a route contained in a routing table?
A. next-hop b. metric/interface c. destination network address
Show Interfaces
Is used by the server to resolve names.
It uses lasers as the light source.

30. Important characteristic of UDP
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
Minimal delays in data delivery.
As the commands are entered.
A. addressing b. error detection c. frame delimiting

31. What are 2 protocols for transfering web resources?
A. addressing b. error detection c. frame delimiting
A. HTTP b. HTTPS
A. performance degradation b. security issues c. host identification
A. perform degradation b. security issues c. host identification

32. What can get you to an outside network?
Is used by the server to resolve names.
Source Port
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A default gateway (router).

33. What kind of problems are caused by excessive broadcast traffic on network segments?
Next-Hop Address
The magnetic field around the adjacent pairs of wire.
Network Layer
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

34. What info is found in the TCP and UDP header info?
SSH
Router(config)# interface FastEthernet 0/1
Source and Destination Ports
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet

35. Group of hosts that have identical bit patterns in the high order bits of their addresses
Network
To facilitate the entry and exit of data on media.
The physical address is added.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

36. What do end devices do?
As the commands are entered.
Switch
Originate data flow.
Console

37. What are 2 email components used to forward mail between servers?
A. application b. presentation c. session d. transmision e. network f. data link g. physical
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. MTA b. SMTP
The packets will be delivered and reassembled at destination.

38. After an ethernet collision - which device has priority to transmit data?
The magnetic field around the adjacent pairs of wire.
Source and Destination Ports
Any device whose backoff timer expires first.
Destination Network Address

39. What is a default gateway address?

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40. 3 features that allow TCP to realibly and accurately track the transmission of data
Is used by the server to resolve names.
No collisions will occur on this link.
A. flow control b. session establishment c. numbering and sequencing
Collisions can decrease network performance.

41. After a browser makes a request to a web server in the standard port - what will be the port number in the TCP header?
A. servers b. routers c. network printers
32 bits
A. flow control b. session establishment c. numbering and sequencing
80 (HTTP)

42. 3 statements of media acess control
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
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
The destination host address.
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

43. What do the intermediary devices in the network do?
Originate data flow.
It uses support from the lower layers to distinguish between connections to the service.
Wireless
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

44. What is a protocol that provides connectionless network layer services?
Binary ANDing
IP Protocol
Resolve IPv4 addresses to MAC addresses.
Console

45. What command can be used to determine if the router has experienced any input or output errors?
Show Interfaces
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
The address of the router that the host will use to 'get to the other side'.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

46. 3 features of IPv6
A. not affected by EMI of RFI b. most expensive type of LAN cabling
UTP
A. larger address space b. data types and classes of service c. authentication and encryption
The packets will be delivered and reassembled at destination.

47. 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
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
Switch

48. 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?
Console
Identify processes or services that are communicating with end devices.
A. replace a switch w/ a router b. subnet the new networks
A. show startup-config b. show running-config

49. What is the name of the application layer protocol used for file sharing on Microsoft Networks?
A. purpose b. geographic location c. ownership
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Source and Destination IP address
SMB

50. What method of signal transmission uses radio waves to carry signals?
Router(config)# hostname Costas
Wireless
A. they initiate data exchanges b. they may upload data to servers
Rollover cable

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CCNA - 2

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