CCNA Module 14-15

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

Session layer Presentation layer Application layer

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

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

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

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, FTP, SMTP

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

HTTP, FTP, SMTP

Which three protocols may devices use in the application process that sends email?

HTTP, SMTP, DNS

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

HTTPS

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

data, printer, and resource sharing without a dedicated server

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

peer-to-peer

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

registered port

Which factor determines TCP window size?

the amount of data the destination can process at one time

What is the function of the HTTP GET message?

to request an HTML page from a web server

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

window and sequence number

Which three statements characterize UDP? (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.

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

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

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

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

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

A client application needs to terminate a TCP communication session with a server. State the termination process steps in the order that they will occur.

1. Client sends FIN 2. Server sends ACK 3. Server sends FIN 4. Client sends ACK

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

Which scenario describes a function provided by the transport layer?

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.

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

ACK

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

Client-Server

What is true about the Server Message Block protocol?

Clients establish a long term connection to servers.

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

DNS

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

FTP, DHCP, POP3

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

Gnutella

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

HTTP

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

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

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.)

Session, Presentation, and Application layers

Why does HTTP use TCP as the transport layer protocol?

because HTTP requires reliable delivery

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

sequence numbers

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

Both models support devices in server and client roles.