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Modules 14 – 15: Network Application Communications Exam

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

The client sets the window size for the session.

The client sends an ISN to the server to start the 3-way handshake.

The client randomly selects a source port number.

The client sends a synchronization segment to begin the session.

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

UDP ACK flag

TCP 3-way handshake

UDP sequence number

TCP port number

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

0 to 255

0 to 1023

256 – 1023

1024 – 49151

4. What is a socket?

The combination of the source and destination IP address and source and destination Ethernet address

The combination of a source IP address and port number or a destination IP address and port number

The combination of the source and destination sequence and acknowledgment numbers

The combination of the source and destination sequence numbers and port numbers

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?

1 segment

10 segments

100 segments

1000 segments

6. Which factor determines TCP window size?

The amount of data to be transmitted

The number of services included in the TCP segment

The amount of data the destination can process at one time

The amount of data the source is capable of sending at one time

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

It just sends the datagrams.

It queries the server to see if it is ready to receive data.

It sends a simplified three-way handshake to the server.

It sends to the server a segment with the SYN flag set to synchronize the conversation.

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

Window Size

Length

Source Port

Acknowledgment Number

Checksum

Sequence Number

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

Identifying the proper application for each communication stream

Tracking the individual communication between applications on the source and destination hosts

Providing frame delimiting to identify bits making up a frame

Performing a cyclic redundancy check on the frame for errors

Providing the interface between applications and the underlying network over which messages are transmitted

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

Port numbers

Sequence numbers

Acknowledgment numbers

Fragment numbers

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

Timing and synchronization

Destination and source port numbers

Destination and source physical addresses

Destination and source logical network addresses

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

Destination devices receive traffic with minimal delay.

Transmitted data segments are tracked.

Destination devices reassemble messages and pass them to an application.

Received data is unacknowledged.

Unacknowledged data packets are retransmitted.

13. A client application needs to terminate a TCP communication session with a server. Place the termination process steps in the order that they will occur. (Not all options are used.)

Step 1

Server sends FIN

Step 3

Client sends ACK

Step 2

Client sends FIN

Step 4

Server sends 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?

FIN

ACK

SYN

RST

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

HTTP

FTP

DNS

SMTP

16. What is a characteristic of UDP?

UDP datagrams take the same path and arrive in the correct order at the destination.

Applications that use UDP are always considered unreliable.

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

UDP only passes data to the network when the destination is ready to receive the data.

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

Registered port

Private port

Dynamic port

Source port

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

SMTP

FTP

SNMP

HTTP

TFTP

DHCP

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

UDP provides basic connectionless transport layer functions.

UDP provides connection-oriented, fast transport of data at Layer 3.

UDP relies on application layer protocols for error detection.

UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.

UDP relies on IP for error detection and recovery.

UDP provides sophisticated flow control mechanisms.

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

Window

Checksum

Source port

Destination port

Sequence number

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

Window

Reserved

Checksum

Control bits

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

To ensure the fastest possible download speed

Because HTTP is a best-effort protocol

Because transmission errors can be tolerated easily

Because HTTP requires reliable delivery

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

Applications that need data flow control

Applications that require reliable delivery

Applications that handle reliability themselves

Applications that need the reordering of segments

Applications that can tolerate some data loss, but require little or no delay

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

Source port numbers and destination port numbers are not necessary when UDP is the transport layer protocol being used for the communication.

Source port and destination port numbers are randomly generated.

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

Destination port numbers are assigned automatically and cannot be changed.

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

When applications need to guarantee that a packet arrives intact, in sequence, and unduplicated

When a faster delivery mechanism is needed

When delivery overhead is not an issue

When applications do not need to guarantee delivery of the data

When destination port numbers are dynamic

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

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

Directing packets towards the destination network

Formatting data into a compatible form for receipt by the destination devices

Conducting error detection of the contents in frames

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

The source MAC address is 48 ones (FF-FF-FF-FF-FF-FF).

The destination IP address is 255.255.255.255.

The message comes from a server offering an IP address.

The message comes from a client seeking an IP address.

All hosts receive the message, but only a DHCP server replies.

Only the DHCP server receives the message.

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

HTTP

SMTP

POP

IMAP

DNS

POP3

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

Different SMB message types have a different format.

Clients establish a long term connection to servers.

SMB messages cannot authenticate a session.

SMB uses the FTP protocol for communication.

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

To request an HTML page from a web server

To send error information from a web server to a web client

To upload content to a web server from a web client

To retrieve client email from an email server using TCP port 110

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

Application

Presentation

Session

Transport

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

Peer-to-peer

Master-slave

Client/server

Point-to-point

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

Both models have dedicated servers.

Both models support devices in server and client roles.

Both models require the use of TCP/IP-based protocols.

Both models are used only in the wired network environment.

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

Peer-to-peer

Client-based

Master-slave

Point-to-point

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

Ethernet

Gnutella

POP

SMTP

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

Wireless networking

Social networking without the Internet

Network printing using a print server

Resource sharing without a dedicated server

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

Physical

Session

Network

Presentation

Data link

Transport

Application

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

A user uses eMule to download a file that is shared by a friend after the file location is determined.

A workstation initiates an ARP to find the MAC address of a receiving host.

A user prints a document by using a printer that is attached to a workstation of a coworker.

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

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

Internetwork

Session

Presentation

Application

Network access

40. What is an advantage of SMB over FTP?

Only with SMB can data transfers occur in both directions.

Only SMB establishes two simultaneous connections with the client, making the data transfer faster.

SMB is more reliable than FTP because SMB uses TCP and FTP uses UDP.

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

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.)

FTP

HTTP

DNS

SNMP

DHCP

SMTP

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

DNS

DHCP

SMTP

HTTP

POP3

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

The FQDN of the alias used to identify a service

The IP address for an FQDN entry

The domain name mapped to mail exchange servers

The IP address of an authoritative name server

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

ARP

TCP

UDP

FTP

POP3

DHCP

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

SMTP

SMB

IMAP

HTTPS

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

Client/server applications

Email applications

P2P applications

Authentication services

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

Scalability

One way data flow

Decentralized resources

Centralized user accounts

Resource sharing without a dedicated server

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

A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.

A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.

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.

A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.

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.)

Physical layer

Session layer

Transport layer

Application layer

Presentation layer

Data link layer

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?

3001

6001

4500

6000

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?

4501

6001

6000

4500

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

3001

1501

1500

53. 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?

54. 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?

55. 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?

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

57. A client creates a packet to send to a server. The client is requesting POP3 service. What number will be used as the destination port number in the sending packet?

110

443

161

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

443

161

110

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

161

443

110

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

443

161

110

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

443

161

110

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