Cisco Module 14-15

• The client randomly selects a source port number.


  Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?
• TCP 3-way handshake


  Which transport layer feature is used to guarantee session establishment?
• 0 to 1023


  What is the complete range of TCP and UDP well-known ports?
• the combination of a source IP address and port number or a destination IP address and port number


  What is a socket?
• 10 segments


  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?
• the amount of data the destination can process at one time


  Which factor determines TCP window size?
• It just sends the datagrams.


  What does a client do when it has UDP datagrams to send?
• Length, Source Port, and Checksum


  Which three fields are used in a UDP segment header?
• identifying the proper application for each communication stream

  
  

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


  What are two roles of the transport layer in data communication on a network?
• sequence numbers


  What information is used by TCP to reassemble and reorder received segments?
• destination and source port numbers


  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.

  Which two characteristics are associated with UDP sessions?
• Client sends FIN

  Server sends ACK

  Server sends FIN

  Client sends ACK


  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.
• ACK


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


  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.


  ​What is a characteristic of UDP?
• registered port


  What kind of port must be requested from IANA in order to be used with a specific application?
• SMTP, FTP, HTTP


  Which three application layer protocols use TCP?
• 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.


  Which three statements characterize UDP?
• window and sequence number


  Which two fields are included in the TCP header but not in the UDP header?
• control bits


  Which field in the TCP header indicates the status of the three-way handshake process?
• because HTTP requires reliable delivery


  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


  Which two types of applications are best suited for UDP?
• If multiple conversations occur that are using the same service, the source port number is used to track the separate conversations.


  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


  In what two situations would UDP be better than TCP as the preferred transport protocol?
• 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


  What are three responsibilities of the transport layer?
• 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.


  Which three statements describe a DHCP Discover message?
• SMTP, DNS


  Which two protocols may devices use in the application process that sends email?
• Clients establish a long term connection to servers.


  What is true about the Server Message Block protocol?
• to request an HTML page from a web server


  What is the function of the HTTP GET message?
• application


  Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?
• client/server


  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.


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


  In what networking model would eDonkey, eMule, BitTorrent, Bitcoin, and LionShare be used?
• Gnutella


  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


  What is a key characteristic of the peer-to-peer networking model?
• Session, Presentation, and Application


  The application layer of the TCP/IP model performs the functions of what three layers of the OSI model?
• A workstation initiates a DNS request when the user types www.cisco.com in the address bar of a web browser.

  What is an example of network communication that uses the client-server model?
• application


  Which layer in the TCP/IP model is used for formatting, compressing, and encrypting data?
• SMB clients can establish a long-term connection to the server.​


  What is an advantage of SMB over FTP?​