NET - 125 MODULES 14-15

The client randomly selects a source port number.*

1. Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

registered port*

17. What kind of port must be requested from IANA in order to be used with a specific application?

sequence numbers*

10. What information is used by TCP to reassemble and reorder received segments?

destination and source port numbers*

11. What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?

Destination devices receive traffic with minimal delay.* Received data is unacknowledged.*

12. Which two characteristics are associated with UDP sessions? (Choose two.)

ACK

14. Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

DNS

15. Which protocol or service uses UDP for a client-to-server communication and TCP for server-to-server communication?

UDP reassembles the received datagrams in the order they were received.*

16. What is a characteristic of UDP?

SMTP FTP HTTP

18. Which three application layer protocols use TCP? (Choose three.)

UDP provides basic connectionless transport layer functions.* UDP relies on application layer protocols for error detection.* UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.*

19. Which three statements characterize UDP? (Choose three.)

TCP 3-way handshake*

2. Which transport layer feature is used to guarantee session establishment?

Window sequence number*

20. Which two fields are included in the TCP header but not in the UDP header? (Choose two.)

control bits*

21. Which field in the TCP header indicates the status of the three-way handshake process?

because HTTP requires reliable delivery*

22. Why does HTTP use TCP as the transport layer protocol?

applications that handle reliability themselves* applications that can tolerate some data loss, but require little or no delay*

23. Which two types of applications are best suited for UDP? (Choose two.)

If multiple conversations occur that are using the same service, the source port number is used to track the separate conversations.*

24. How are port numbers used in the TCP/IP encapsulation process?

when a faster delivery mechanism is needed* when applications do not need to guarantee delivery of the data*

25. In what two situations would UDP be better than TCP as the preferred transport protocol? (Choose two.)

meeting the reliability requirements of applications, if any* multiplexing multiple communication streams from many users or applications on the same network* identifying the applications and services on the client and server that should handle transmitted data*

26. What are three responsibilities of the transport layer? (Choose three.)

The destination IP address is 255.255.255.255.* The message comes from a client seeking an IP address.* All hosts receive the message, but only a DHCP server replies.*

27. Which three statements describe a DHCP Discover message? (Choose three.)

SMTP DNS

28. Which two protocols may devices use in the application process that sends email? (Choose two.)

Clients establish a long term connection to servers.*

29. What is true about the Server Message Block protocol?

0 to 1023*

3. What is the complete range of TCP and UDP well-known ports?

to request an HTML page from a web server*

30. What is the function of the HTTP GET message?

Application*

31. Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?

client/server*

32. Which networking model is being used when an author uploads one chapter document to a file server of a book publisher?

Both models support devices in server and client roles.*

33. What do the client/server and peer-to-peer network models have in common?

peer-to-peer*

34. In what networking model would eDonkey, eMule, BitTorrent, Bitcoin, and LionShare be used?

gnutella

35. What is a common protocol that is used with peer-to-peer applications such as WireShare, Bearshare, and Shareaza?

resource sharing without a dedicated server*

36. What is a key characteristic of the peer-to-peer networking model?

session presentation application

37. The application layer of the TCP/IP model performs the functions of what three layers of the OSI model? (Choose three.)

A workstation initiates a DNS request when the user types www.cisco.com in the address bar of a web browser.*

38. What is an example of network communication that uses the client-server model?

application

39. Which layer in the TCP/IP model is used for formatting, compressing, and encrypting data?

the combination of a source IP address and port number or a destination IP address and port number*

4. What is a socket?

SMB clients can establish a long-term connection to the server.​*

40. What is an advantage of SMB over FTP?​

FTP HTTP SMTP

41. A manufacturing company subscribes to certain hosted services from its ISP. The services that are required include hosted world wide web, file transfer, and e-mail. Which protocols represent these three key applications? (Choose three.)

HTTP

42. Which application layer protocol uses message types such as GET, PUT, and POST?

the domain name mapped to mail exchange servers*

43. What type of information is contained in a DNS MX record?

FTP* POP3* DHCP*

44. Which three protocols operate at the application layer of the TCP/IP model? (Choose three.)

HTTPS

45. Which protocol is used by a client to communicate securely with a web server?

P2P applications*

46. Which applications or services allow hosts to act as client and server at the same time?

decentralized resources* resource sharing without a dedicated server*

47. What are two characteristics of peer-to-peer networks? (Choose two.)

A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.*

48. Which scenario describes a function provided by the transport layer?

session layer application layer presentation layer

49. Which three layers of the OSI model provide similar network services to those provided by the application layer of the TCP/IP model? (Choose three.)

10 segments*

5. A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?

3001

50. A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received two packets of data from the PC?

4501

51. A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received three packets of data from the PC?

6001

52. A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received four packets of data from the PC?

6001

53. A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received four packets of data from the PC?

3001

54. A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received two packets of data from the PC?

the amount of data the destination can process at one time*

6. Which factor determines TCP window size?

69

60. A client creates a packet to send to a server. The client is requesting TFTP service. What number will be used as the destination port number in the sending packet?

21

61. A client creates a packet to send to a server. The client is requesting FTP service. What number will be used as the destination port number in the sending packet?

22

62. A client creates a packet to send to a server. The client is requesting SSH service. What number will be used as the destination port number in the sending packet?

It just sends the datagrams.*

7. What does a client do when it has UDP datagrams to send?

Length source port checksum

8. Which three fields are used in a UDP segment header? (Choose three.)

tracking the individual communication between applications on the source and destination hosts*

9. What are two roles of the transport layer in data communication on a network? (Choose two.)

80

HTTP PORT

443

HTTPS

110

POP3 PORT

25

SMTP

161

SNMP

23

TELLNET

client: FIN server: ACK+ FIN client ACK

termination steps