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CCNA - 2

Instructions:

Answer 50 questions in 15 minutes.
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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 is an effect of improperly applying a network cable connector?
Destination Network Address
Network portion
It does not support encryption.
Signal loss can be experienced.

2. In a connectionless system - What is correct?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. hot keys b. context-sensitive c. command syntax check
Destination is not contacted before a packet is sent.
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

3. 3 features that allow TCP to realibly and accurately track the transmission of data
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
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. flow control b. session establishment c. numbering and sequencing
A. goodput b. throughput c. bandwidth

4. What is dinamically selected by the source host when forwarding data?
Switch
Network Layer Packet
Source Port
Supports error detection.

5. What is a drawback of the CSMA/CD access method?
Collisions can decrease network performance.
A. DB 60 b. Winchester 15-pin c. smart serial
A. show startup-config b. show running-config
0 to 1023

6. What can be a problem that is reduced by adding end-to-end addressing?
The packets will be delivered and reassembled at destination.
A. Cat5 UTP b. Cat6 UTP
A. minimizing of collisions b. division into broadcast domains
It reduces unnecessary broadcasts.

7. What characteristic of an UTP helps reduce interference?
A. it has centralized administration b. security is easier to enforce
Twisting of the cables
A. purpose b. geographic location c. ownership
A default gateway (router).

8. 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.
IP is not properly installed
Any device whose backoff timer expires first.
Network Media Control

9. Important characteristic of UDP
Minimal delays in data delivery.
To prevent the receiver from being overwhelmed by incoming data.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. application b. services

10. What are 2 protocols for transfering web resources?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Network Access
A. HTTP b. HTTPS
A. copper UTP b. optical fiber

11. 2 characteristics of clients in data networks
A. next-hop b. metric/interface c. destination network address
Host A
A. they initiate data exchanges b. they may upload data to servers
Application Layer

12. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
Network Layer Packet
A. larger address space b. data types and classes of service c. authentication and encryption
Identify processes or services that are communicating with end devices.
Show Interfaces

13. 2 most commonly used media types in ethernet networks
OTDR
Identify the device that allows local network computers to communicate w/ devices in other networks.
Hosts return to listen-before-transmit mode.
A. copper UTP b. optical fiber

14. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
Is used by the server to resolve names.
Window Size
Static
The MAC protocol can be very simple.

15. What is the primary rope of the physical layer in transmitting data?
A. low overhead b. connectionless
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Create signals that represent the bits in each frame for the media.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

16. What is a default gateway address?

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17. What are 3 common problems w/ large networks?
Router
A. netstat -r b. route PRINT
A. perform degradation b. security issues c. host identification
TCP initializes the sequence numbers for the sessions.

18. There are too many broadcasts on switches - what can be done?
Is a layer of specific encapsulation.
Transport
Twisting of the cables
A. replace a switch w/ a router b. subnet the new networks

19. Default Gateway is incorrect on the host - What is the impact on the communications?
2046
A. show startup-config b. show running-config
Resolve IPv4 addresses to MAC addresses.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.

20. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Supports error detection.
A. next-hop b. metric/interface c. destination network address
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
Collisions can decrease network performance.

21. What is the primary purpose of ARP?
A. they initiate data exchanges b. they may upload data to servers
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
Destination is not contacted before a packet is sent.
Resolve IPv4 addresses to MAC addresses.

22. What are 2 email components used to forward mail between servers?
Is used by the server to resolve names.
A. minimizing of collisions b. division into broadcast domains
80 (HTTP)
A. MTA b. SMTP

23. 3 statements about routes and their use
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. addressing b. error detection c. frame delimiting
A. application b. services
32 bits

24. Which type of cable is most often associated w/ fiber-optic cable?
32 bits
Hub
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
A backbone cable.

25. statements of IP adressing
OTDR
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. enable mode b. priviledge executive mode
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

26. A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?
Collisions can decrease network performance.
172.16.192.160
A. media sharing b. logical topology
Logical Link Control sublayer

27. 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?
Rollover cable
2046
To prevent the receiver from being overwhelmed by incoming data.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

28. What connectors are commonly associated w/ Cisco's V.35 serial cables?
A. flow control b. session establishment c. numbering and sequencing
UTP
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A. DB 60 b. Winchester 15-pin c. smart serial

29. In business LANs - which connector is used w/ twisted-pair networking cable?
Ctrl + Shift + 6
RJ-45
A. purpose b. geographic location c. ownership
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1

30. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
A. netstat -r b. route PRINT
Hosts return to listen-before-transmit mode.
TCP initializes the sequence numbers for the sessions.
A random delay helps prevent the stations from experiencing another collision during transmission.

31. 3 common problems w/ a large network
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. performance degradation b. security issues c. host identification
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
A. Cat5 UTP b. Cat6 UTP

32. 3 facts about the network portion of an IPv4 address
Logical Link Control sublayer
SSH
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. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet

33. 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
Next-Hop Address
To facilitate the entry and exit of data on media.
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

34. 3 features of IPv6
Network address
Is a layer of specific encapsulation.
A. larger address space b. data types and classes of service c. authentication and encryption
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

35. Which device is used to create or divide broadcast domains?
A. larger address space b. data types and classes of service c. authentication and encryption
Create signals that represent the bits in each frame for the media.
It provides for the exchange of data over a common local media.
Router

36. What is a disadvantage of Telnet?
Is a layer of specific encapsulation.
Rollover cable
Network portion
It does not support encryption.

37. At which layers of the OSI model does ethernet operate?
DNS
255.255.255.0
A. physical layer b. DLL layer
A. HTTP b. HTTPS

38. What is the primary function of encapsulating packets into frames?
Network address
MAC
Switch
To facilitate the entry and exit of data on media.

39. 2 features that make switches preferable to hubs
A. purpose b. geographic location c. ownership
A. minimizing of collisions b. division into broadcast domains
OTDR
Collisions can decrease network performance.

40. When destination network is not in the routing table - What are 2 actions the router might take?
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Console
Network address

41. Intermediary devices used to implement security between networks
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
Transport
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

42. What kind of problems are caused by excessive broadcast traffic on network segments?
Any device whose backoff timer expires first.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
IP is not properly installed
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

43. What is the purpose of a default gateway?
RJ-45
A. goodput b. throughput c. bandwidth
The packets will be delivered and reassembled at destination.
Identify the device that allows local network computers to communicate w/ devices in other networks.

44. What info is found in the TCP and UDP header info?
DNS
Source and Destination Ports
Hub
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

45. What are 2 features of User Diagram Protocol (UDP)?
A. goodput b. throughput c. bandwidth
TCP initializes the sequence numbers for the sessions.
Identify processes or services that are communicating with end devices.
A. low overhead b. connectionless

46. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
Source Port
Application Layer
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. copper UTP b. optical fiber

47. 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?
Host A
Binary ANDing
It provides interface between applications on either end of the network.
A random delay helps prevent the stations from experiencing another collision during transmission.

48. What is the function of the DLL?
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
It provides for the exchange of data over a common local media.
172.16.192.160
Router(config)# interface FastEthernet 0/1

49. Which OSI model layer is responsible for regulating the flow of information from source to destination - reliably and accurately?
UDP
Console interface
Transport
The destination host address.

50. If you have a full-duplex operational network - what can happen?
No collisions will occur on this link.
A. show startup-config b. show running-config
The magnetic field around the adjacent pairs of wire.
A. replace a switch w/ a router b. subnet the new networks

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CCNA - 2

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