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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 statements describe the logical token-passing topology?
The magnetic field around the adjacent pairs of wire.
A. Physical b. Data Link
To prevent the receiver from being overwhelmed by incoming data.
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other

2. What is a default gateway address?

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3. What is the primary reason for developing IPv6?
Network Access
As the commands are entered.
It has expanded adressing capabilities.
The physical address is added.

4. What info is found in the TCP and UDP header info?
A. application b. services
Source and Destination Ports
Host mobility
A. enable mode b. priviledge executive mode

5. What is the function of the DLL?
A. media sharing b. logical topology
It provides for the exchange of data over a common local media.
A. copper UTP b. optical fiber
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

6. How many bits make up an IPv4 address?
8
32 bits
Source and Destination Ports
FTP

7. What describes the purpose of default route?
Signal loss can be experienced.
A. copper UTP b. optical fiber
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.

8. During a TCP session - if packets arrive out of order - what will happen?
Switch
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
Router
The packets will be delivered and reassembled at destination.

9. 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
Host A
A. non-deterministic b. less overhead c. collisions exist
Destination Network Address
A. the router will discard the packet b. the router will send a time exceeded message to the source host

10. Which 2 options represent Layer 4 addressing?
A. identifies the communicating applications b. identifies multiple conversations between the hosts
Any device whose backoff timer expires first.
A default gateway (router).
Console interface

11. 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?
255.255.255.224
Source Port
Source and Destination Ports
172.16.192.160

12. What do the intermediary devices in the network do?
Originate data flow.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
The destination host address.
A random delay helps prevent the stations from experiencing another collision during transmission.

13. If you want to connect 4 hosts in a home network - what would be the best deviced to be used?
It uses lasers as the light source.
Next-Hop Address
Hosts return to listen-before-transmit mode.
Switch

14. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
FTP
It uses lasers as the light source.
Network portion
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1

15. Given IP 172.16.134.64 and S/M 255.255.255.224 - this IP is an...?
A. HTTP b. HTTPS
Network address
Any device whose backoff timer expires first.
A. next-hop b. metric/interface c. destination network address

16. When is a straight-through cable used in a network?
Network Media Control
IP Protocol
Any device whose backoff timer expires first.
When connecting a host to a switch.

17. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
RJ-45
MAC
255.255.255.0
A. router b. firewall

18. In a connectionless system - What is correct?
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. performance degradation b. security issues c. host identification
A. larger address space b. data types and classes of service c. authentication and encryption
Destination is not contacted before a packet is sent.

19. Why is flow control used for TCP data transfer?
Next-Hop Address
Any device whose backoff timer expires first.
To prevent the receiver from being overwhelmed by incoming data.
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long

20. What is a characteristic of a logical point-to-point topology?
The MAC protocol can be very simple.
A. copper UTP b. optical fiber
Destination Network Address
Any device whose backoff timer expires first.

21. 3 measures of data transfer
Network address
Rollover cable
Static
A. goodput b. throughput c. bandwidth

22. What is a disadvantage of Telnet?
A. media sharing b. logical topology
It does not support encryption.
DNS
MAC

23. What can be a problem that is reduced by adding end-to-end addressing?
A. purpose b. geographic location c. ownership
They must wait until the first hosts finish transfering the media.
Next-Hop Address
It reduces unnecessary broadcasts.

24. Which device is used to create or divide broadcast domains?
Router
A. receives emails from clients MUA b. uses SMTP to route email between servers c. passes email to MDA for final delivery
Time-to-live (TTL)
A random delay helps prevent the stations from experiencing another collision during transmission.

25. What are 2 features of User Diagram Protocol (UDP)?
DNS
A. low overhead b. connectionless
A. netstat -r b. route PRINT
A backbone cable.

26. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
A. MTA b. SMTP
Window Size
A. they initiate data exchanges b. they may upload data to servers
80 (HTTP)

27. Which sublayer of the DLL prepares a signal to be transmitted at the physical layer?
A. identifies the communicating applications b. identifies multiple conversations between the hosts
MAC
FTP
255.255.255.224

28. An admin needs to keep contents private - which access method should he use?
Router(config)# hostname Costas
A. netstat -r b. route PRINT
SSH
Network portion

29. Default Gateway is incorrect on the host - What is the impact on the communications?
Identify the device that allows local network computers to communicate w/ devices in other networks.
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
It uses support from the lower layers to distinguish between connections to the service.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.

30. During encapsulation - what happens in the Data Link Layer?
Window Size
It reduces unnecessary broadcasts.
A. physical layer b. DLL layer
The physical address is added.

31. There are too many broadcasts on switches - what can be done?
A. Physical b. Data Link
Network Access
A. replace a switch w/ a router b. subnet the new networks
Source Port

32. 2 most commonly used media types in ethernet networks
A. copper UTP b. optical fiber
Hosts return to listen-before-transmit mode.
The destination host address.
Hub

33. Which OSI model layer is responsible for regulating the flow of information from source to destination - reliably and accurately?
A. router b. firewall
Transport
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. non-deterministic b. less overhead c. collisions exist

34. What are 2 protocols for transfering web resources?
A. HTTP b. HTTPS
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
UTP
Binary ANDing

35. 3 features that allow TCP to realibly and accurately track the transmission of data
A. next-hop b. metric/interface c. destination network address
Network portion
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. flow control b. session establishment c. numbering and sequencing

36. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Console interface
A. next-hop b. metric/interface c. destination network address
Hosts return to listen-before-transmit mode.
A. perform degradation b. security issues c. host identification

37. Network Protocols
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
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

38. After an ethernet collision - which device has priority to transmit data?
32 bits
Any device whose backoff timer expires first.
A. goodput b. throughput c. bandwidth
The address of the router that the host will use to 'get to the other side'.

39. When destination network is not in the routing table - What are 2 actions the router might take?
A. copper UTP b. optical fiber
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Host A
Source and Destination IP address

40. What is a component of a routing table entry?
Source and Destination Ports
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. application b. presentation c. session d. transmision e. network f. data link g. physical
Next-Hop Address

41. What type of network cable is used between a terminal and a console port?
Rollover cable
A. the router will discard the packet b. the router will send a time exceeded message to the source host
The address of the router that the host will use to 'get to the other side'.
Static

42. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
Physical
Next-Hop Address
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
172.16.192.160

43. 3 statements about the role of routers in the network
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
FTP
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
The MAC protocol can be very simple.

44. Which IP packet field will prevent endless loops?
It uses support from the lower layers to distinguish between connections to the service.
Time-to-live (TTL)
Flash
It provides interface between applications on either end of the network.

45. What is the name of the application layer protocol used for file sharing on Microsoft Networks?
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
Destination is not contacted before a packet is sent.
Twisting of the cables
SMB

46. What is the primary purpose of ARP?
Resolve IPv4 addresses to MAC addresses.
A. servers b. routers c. network printers
Network Media Control
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

47. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Supports error detection.
2046
Host mobility
A. hot keys b. context-sensitive c. command syntax check

48. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
Physical
To facilitate the entry and exit of data on media.
UDP
IP is not properly installed

49. At which layers of the OSI model does ethernet operate?
Collisions can decrease network performance.
Transport
A. physical layer b. DLL layer
SMB

50. What layer encapsulates segments into packets?
A. netstat -r b. route PRINT
To facilitate the entry and exit of data on media.
Network Layer
A. identifies the communicating applications b. identifies multiple conversations between the hosts