Modules 14 - 15
Which protocol is used by a client to communicate securely with a web server?
HTTPS
"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?
10 segments
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
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?
3000
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? 110
443
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
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.
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.
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 three statements describe a DHCP Discover message? (Choose three.)
All hosts receive the message, but only a DHCP server replies. The message comes from a server offering an IP address. The destination IP address is 255.255.255.255.
What is true about the Server Message Block protocol?
Clients establish a long term connection to servers.
Which three protocols operate at the application layer of the TCP/IP model? (Choose three.)
DHCP FTP POP3
Which protocol or service uses UDP for a client-to-server communication and TCP for server-to-server communication?
DNS
Which two protocols may devices use in the application process that sends email? (Choose two.)
DNS SMTP
Which two characteristics are associated with UDP sessions? (Choose two.)
Destination devices receive traffic with minimal delay. Received data is unacknowledged.
What is a common protocol that is used with peer-to-peer applications such as WireShare, Bearshare, and Shareaza?
Gnutella
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.
What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?
If multiple conversations occur that are using the same service, the source port number is used to track the separate conversations.
What does a client do when it has UDP datagrams to send?
It just sends the datagrams.
Which three fields are used in a UDP segment header? (Choose three.)
Length Checksum Source Port
Which applications or services allow hosts to act as client and server at the same time?
P2P applications
What is an advantage of SMB over FTP?
SMB clients can establish a long-term connection to the server.
Which three application layer protocols use TCP? (Choose three.)
SMTP HTTP FTP
Which three statements characterize UDP? (Choose three.)
UDP is a low-overhead protocol that does not provide sequencing or flow control mechanisms. UDP relies on application layer protocols for error detection. UDP provides basic connectionless transport layer functions.
What is a characteristic of UDP?
UDP reassembles the received datagrams in the order they were received.
Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?
application
Which layer in the TCP/IP model is used for formatting, compressing, and encrypting data?
application
Which two types of applications are best suited for UDP? (Choose two.)
applications that can tolerate some data loss, but require little or no delay applications that handle reliability themselves
Why does HTTP use TCP as the transport layer protocol?
because HTTP requires reliable delivery
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.)
client sends ACK Step 4 client sends FIN Step 1 server sends ACK Step 2 server sends FIN Step 3
Which networking model is being used when an author uploads one chapter document to a file server of a book publisher?
client/server
Which field in the TCP header indicates the status of the three-way handshake process?
control bits
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 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
What is a key characteristic of the peer-to-peer networking model?
resource sharing without a dedicated server
What are two characteristics of peer-to-peer networks? (Choose two.)
resource sharing without a dedicated server decentralized resources
The application layer of the TCP/IP model performs the functions of what three layers of the OSI model? (Choose three.)
session application presentation
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 layer application layer presentation layer
Which factor determines TCP window size?
the amount of data the destination can process at one time
What type of information is contained in a DNS MX record?
the domain name mapped to mail exchange servers
What is the function of the HTTP GET message?
to request an HTML page from a web server
In what two situations would UDP be better than TCP as the preferred transport protocol? (Choose two.)
when applications do not need to guarantee delivery of the data when a faster delivery mechanism is needed
Which two fields are included in the TCP header but not in the UDP header? (Choose two.)
window sequence number
What do the client/server and peer-to-peer network models have in common?
Both models support devices in server and client roles.
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 SMTP HTTP
Which application layer protocol uses message types such as GET, PUT, and POST?
HTTP