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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. What is a protocol that provides connectionless network layer services?
A. router b. firewall
Transport
A. not affected by EMI of RFI b. most expensive type of LAN cabling
IP Protocol

2. 2 most commonly used media types in ethernet networks
Supports error detection.
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. it has centralized administration b. security is easier to enforce
A. copper UTP b. optical fiber

3. Which IP packet field will prevent endless loops?
Source and Destination IP address
Time-to-live (TTL)
255.255.255.224
0 to 1023

4. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
255.255.255.0
Twisting of the cables

5. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Physical
Supports error detection.
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. hot keys b. context-sensitive c. command syntax check

6. What is dinamically selected by the source host when forwarding data?
Source Port
2046
Rollover cable
A. show startup-config b. show running-config

7. What is a characteristic of a single-mode fiber-optic cable?
It uses lasers as the light source.
A. goodput b. throughput c. bandwidth
Static
Hosts return to listen-before-transmit mode.

8. What is the role of MTA in handling email?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Show Interfaces
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Console interface

9. What is PDU?
A. addressing b. error detection c. frame delimiting
8
FTP
Is a layer of specific encapsulation.

10. What command will you use to place the router into the correct mode to configure an appropiate interface to connect a LAN?
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Identify processes or services that are communicating with end devices.
The destination host address.
Router(config)# interface FastEthernet 0/1

11. What is a drawback of the CSMA/CD access method?
Collisions can decrease network performance.
A. non-deterministic b. less overhead c. collisions exist
Supports error detection.
Router(config)# hostname Costas

12. What is the primary purpose of Layer 4?
A. application b. services
Identify processes or services that are communicating with end devices.
A. HTTP b. HTTPS
Hub

13. When do changes take effect in a Cisco router?
Any device whose backoff timer expires first.
A random delay helps prevent the stations from experiencing another collision during transmission.
A. enable mode b. priviledge executive mode
As the commands are entered.

14. Which device is used to create or divide broadcast domains?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
It provides interface between applications on either end of the network.
Is used by the server to resolve names.
Router

15. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
A. purpose b. geographic location c. ownership
Hub
UTP
Window Size

16. At which layer of the TCP/IP model does ethernet operate?
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
Network Access
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
Network Layer Packet

17. 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?
A. minimizing of collisions b. division into broadcast domains
2046
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
Hosts return to listen-before-transmit mode.

18. What makes fiber preferable to copper for interconnecting buildings?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
UDP
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs

19. What is the purpose of the TCP/IP Network Application Layer?
A. next-hop b. metric/interface c. destination network address
Logical Link Control sublayer
172.16.192.160
Network Media Control

20. 3 functions of the upper data link sublayer in the OSI model
Is a layer of specific encapsulation.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
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 destination host address.

21. 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?
IP is not properly installed
8
A. identifies the communicating applications b. identifies multiple conversations between the hosts
Application Layer

22. What is a characteristic of a logical point-to-point topology?
The MAC protocol can be very simple.
Network Media Control
Supports error detection.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

23. 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?
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
172.16.192.160
The MAC protocol can be very simple.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.

24. 2 characteristics of clients in data networks
A. they initiate data exchanges b. they may upload data to servers
Router(config)# hostname Costas
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
Switch

25. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
Is used by the server to resolve names.
A. goodput b. throughput c. bandwidth
OTDR
Fiber

26. An admin wants to evaluate all traffic in a network. To ensure that all packets are captured - what network device should be used?
Binary ANDing
It provides interface between applications on either end of the network.
A physical topology.
Hub

27. Which combination of keys can be used to interrupt a ping or traceroute process?
SMB
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Ctrl + Shift + 6
Console

28. What do the intermediary devices in the network do?
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. decentralized resources b. resource sharing w/o a dedicated server
A random delay helps prevent the stations from experiencing another collision during transmission.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

29. What is the role of the OSI Application Layer?
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
Network Media Control
It provides interface between applications on either end of the network.
Console interface

30. When a network service fails - which port is most often used to access a router for management purposes?
Console
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. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
A. not affected by EMI of RFI b. most expensive type of LAN cabling

31. What information is added during encapsulation at OSI Layer 3?
Resolve IPv4 addresses to MAC addresses.
It does not support encryption.
Source and Destination IP address
As the commands are entered.

32. What method of signal transmission uses radio waves to carry signals?
Network
A. MTA b. SMTP
Wireless
A. flow control b. session establishment c. numbering and sequencing

33. What characteristic of an UTP helps reduce interference?
Twisting of the cables
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
SSH

34. Which type of cable is most often associated w/ fiber-optic cable?
Window Size
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
80 (HTTP)
A backbone cable.

35. 3 features that allow TCP to realibly and accurately track the transmission of data
Console
A. flow control b. session establishment c. numbering and sequencing
UTP
Switch

36. After an ethernet collision - which device has priority to transmit data?
DNS
Any device whose backoff timer expires first.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
A. router b. firewall

37. What is the purpose of the preamble in an ethernet frame?
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
0 to 1023
A. replace a switch w/ a router b. subnet the new networks
Network Layer Packet

38. What are key considering factors when grouping hosts into common networks?
IP Protocol
A. physical layer b. DLL layer
A. purpose b. geographic location c. ownership
Identify processes or services that are communicating with end devices.

39. Which layer supplies services and allows user interface?
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.
Application Layer
Create signals that represent the bits in each frame for the media.

40. What are 2 layers of the OSI model that have the same functions as the TCP/IP Network Application Layer?
A. Physical b. Data Link
Flash
A. show startup-config b. show running-config
Signal loss can be experienced.

41. Intermediary devices used to implement security between networks
A. router b. firewall
Router(config)# hostname Costas
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

42. How many bits make up an IPv4 address?
A physical topology.
SSH
32 bits
MAC

43. What are 2 email components used to forward mail between servers?
A. MTA b. SMTP
SMB
A. it has centralized administration b. security is easier to enforce
Flash

44. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
A. Physical b. Data Link
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. performance degradation b. security issues c. host identification

45. If you have an Ethernet Frame w/ a Header - Data and a Trailer. It is a...?
Network Layer Packet
As the commands are entered.
Console interface
When connecting a host to a switch.

46. 3 primary functions of the data link layer encapsulation
It does not support encryption.
A. addressing b. error detection c. frame delimiting
Resolve IPv4 addresses to MAC addresses.
Identify processes or services that are communicating with end devices.

47. 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
Router(config)# interface FastEthernet 0/1
To prevent the receiver from being overwhelmed by incoming data.
Network Layer

48. What is the primary purpose of ARP?
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. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. performance degradation b. security issues c. host identification
Resolve IPv4 addresses to MAC addresses.

49. Network Protocols
Host mobility
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. netstat -r b. route PRINT

50. Important characteristic of UDP
Minimal delays in data delivery.
A. router b. firewall
A. physical layer b. DLL layer
Host A