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CCNA - 2

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. After an ethernet collision - which device has priority to transmit data?
8
A. purpose b. geographic location c. ownership
Any device whose backoff timer expires first.
A. they initiate data exchanges b. they may upload data to servers

2. An admin needs a media that can run up to 100m in legth. Which type of media would be best?
UTP
As the commands are entered.
Twisting of the cables
Signal loss can be experienced.

3. What is the function of the DLL?
A backbone cable.
Binary ANDing
It provides for the exchange of data over a common local media.
Identify the device that allows local network computers to communicate w/ devices in other networks.

4. If there is a graphic representation of a company network wiring and equipment - What is this called?
A physical topology.
32 bits
Logical Link Control sublayer
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment

5. What are 2 common characteristics associated w/ dynamic routing protocols?
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
It uses lasers as the light source.
A random delay helps prevent the stations from experiencing another collision during transmission.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

6. Network Protocols
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Next-Hop Address
The packets will be delivered and reassembled at destination.
Rollover cable

7. What kind of problems are caused by excessive broadcast traffic on network segments?
When connecting a host to a switch.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Create signals that represent the bits in each frame for the media.

8. What event occurs during the 3-way handshake?
Switch
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
It uses lasers as the light source.
TCP initializes the sequence numbers for the sessions.

9. What application layer protocol is used to support file transfers between client and server?
When connecting a host to a switch.
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
FTP

10. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
Create signals that represent the bits in each frame for the media.
A random delay helps prevent the stations from experiencing another collision during transmission.
A. servers b. routers c. network printers
Destination Network Address

11. 3 facts about the network portion of an IPv4 address
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
Resolve IPv4 addresses to MAC addresses.
8
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

12. What is the primary purpose of ARP?
Window Size
The MAC protocol can be very simple.
Resolve IPv4 addresses to MAC addresses.
A. netstat -r b. route PRINT

13. What can be a problem that is reduced by adding end-to-end addressing?
It reduces unnecessary broadcasts.
Network portion
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
Source Port

14. What are 2 features of User Diagram Protocol (UDP)?
It uses lasers as the light source.
A. low overhead b. connectionless
TCP initializes the sequence numbers for the sessions.
Twisting of the cables

15. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
Destination is not contacted before a packet is sent.
IP is not properly installed
Twisting of the cables
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

16. 3 measures of data transfer
A. goodput b. throughput c. bandwidth
A. servers b. routers c. network printers
A. minimizing of collisions b. division into broadcast domains
Wireless

17. During a TCP session - if packets arrive out of order - what will happen?
The destination host address.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
They must wait until the first hosts finish transfering the media.
The packets will be delivered and reassembled at destination.

18. 2 features that make switches preferable to hubs
Any device whose backoff timer expires first.
MAC
A. MTA b. SMTP
A. minimizing of collisions b. division into broadcast domains

19. What is the primary reason for developing IPv6?
IP is not properly installed
DNS
It has expanded adressing capabilities.
2046

20. Which device is used to create or divide broadcast domains?
Wireless
Router
Identify processes or services that are communicating with end devices.
A. HTTP b. HTTPS

21. How many bits make up an IPv4 address?
32 bits
Switch
It provides for the exchange of data over a common local media.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

22. With TCP/IP encapsulation - which range of port numbers identifies all well known applications?
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
0 to 1023
Network portion

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

24. If you want to connect 4 hosts in a home network - what would be the best deviced to be used?
Transport
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
Switch
Collisions can decrease network performance.

25. 3 statements of media acess control
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. DNS b. SMTP c. POP
Is used by the server to resolve names.
UDP

26. 2 functions of encapsulation
32 bits
Network portion
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
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

27. Important characteristic of UDP
SSH
Is a layer of specific encapsulation.
Minimal delays in data delivery.
The packets will be delivered and reassembled at destination.

28. What is dinamically selected by the source host when forwarding data?
Source Port
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Source and Destination Ports
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

29. 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. Cat5 UTP b. Cat6 UTP
Identify processes or services that are communicating with end devices.
A. performance degradation b. security issues c. host identification
They must wait until the first hosts finish transfering the media.

30. There are too many broadcasts on switches - what can be done?
A. replace a switch w/ a router b. subnet the new networks
Rollover cable
It has expanded adressing capabilities.
A. the router will discard the packet b. the router will send a time exceeded message to the source host

31. Which OSI model layer is responsible for regulating the flow of information from source to destination - reliably and accurately?
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Transport
A. the router will discard the packet b. the router will send a time exceeded message to the source host

32. What does the IEEE 802.2 standard represent in Ethernet technologies?
Logical Link Control sublayer
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Collisions can decrease network performance.
A. flow control b. session establishment c. numbering and sequencing

33. 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
A. identifies the communicating applications b. identifies multiple conversations between the hosts
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Network portion
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

34. 3 statements about the role of routers in the network
A. low overhead b. connectionless
Show Interfaces
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
To facilitate the entry and exit of data on media.

35. 3 common problems w/ a large network
Destination is not contacted before a packet is sent.
Network Layer
Network Media Control
A. performance degradation b. security issues c. host identification

36. Why is flow control used for TCP data transfer?
Create signals that represent the bits in each frame for the media.
The MAC protocol can be very simple.
To prevent the receiver from being overwhelmed by incoming data.
A. performance degradation b. security issues c. host identification

37. Group of hosts that have identical bit patterns in the high order bits of their addresses
It uses lasers as the light source.
Network address
A. larger address space b. data types and classes of service c. authentication and encryption
Network

38. At which layer of the TCP/IP model does ethernet operate?
It reduces unnecessary broadcasts.
Network Access
Router
A physical topology.

39. What can you identify when you examine the Network Layer header?
It uses support from the lower layers to distinguish between connections to the service.
No collisions will occur on this link.
The destination host address.
Destination Network Address

40. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
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. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
It uses lasers as the light source.
Hosts return to listen-before-transmit mode.

41. What layer encapsulates segments into packets?
A. hot keys b. context-sensitive c. command syntax check
80 (HTTP)
Network Layer
A. the router will discard the packet b. the router will send a time exceeded message to the source host

42. What are 3 common problems w/ large networks?
Identify processes or services that are communicating with end devices.
Hosts return to listen-before-transmit mode.
IP is not properly installed
A. perform degradation b. security issues c. host identification

43. What is a drawback of the CSMA/CD access method?
Logical Link Control sublayer
Next-Hop Address
To enable a receiving host to forward the data to the appropriate application.
Collisions can decrease network performance.

44. In business LANs - which connector is used w/ twisted-pair networking cable?
255.255.255.0
A. Cat5 UTP b. Cat6 UTP
RJ-45
80 (HTTP)

45. 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?
8
A. Physical b. Data Link
Hosts return to listen-before-transmit mode.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

46. When a network service fails - which port is most often used to access a router for management purposes?
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
Console
32 bits
They must wait until the first hosts finish transfering the media.

47. What info is found in the TCP and UDP header info?
A. identifies the communicating applications b. identifies multiple conversations between the hosts
IP Protocol
RJ-45
Source and Destination Ports

48. What are the advantages of using a client-server model?
Source and Destination Ports
A. it has centralized administration b. security is easier to enforce
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
No collisions will occur on this link.

49. What is the primary function of encapsulating packets into frames?
A. hot keys b. context-sensitive c. command syntax check
To facilitate the entry and exit of data on media.
Console
Host A

50. What connectors are commonly associated w/ Cisco's V.35 serial cables?
A. DB 60 b. Winchester 15-pin c. smart serial
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
Destination is not contacted before a packet is sent.
Router