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47 Cards in this Set
- Front
- Back
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What layer of the TCP/IP model is responsible for establishing a temporary communication session between two applications and delivering data between them?
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Transport layer
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Tracking the individual communication between applications on the source and destination hosts, segmenting data for manageability and reassembling segmented data into streams of application data at the destination, and identifying the proper application for each communication is the responsibility of what protocols?
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Transport layer
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Tracking individual conversations, Segmenting data and reassembling segments, and identifying the applications are all roles of what OSI layer?
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Transport layer 4
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Each particular set of data flowing between a source application and a destination application is known as what?
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Conversation
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Segmentaion and encapsulation of data into manageable sizes are part of the transport layer responsibilities, T or F?
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T
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Ensuring that even with multiple applications running on a device, all applications receive the correct data is part of the transport layers responsibilities, T or F?
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T
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What identifier is used to pass data streams to the proper application?
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Port numbers
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Segmenting data into smaller chunks enables many different communications, from many different users to be interleaved on the same network. This is also known as what?
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Multiplexing
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What does the transport layer add to a segment in order to enable different transport layer protocols to perform different functions?
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Header
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What are 2 protocols that are used at the transport layer?
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TCP
UDP |
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What are the 3 basic operations of reliability of TCP?
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Tracking transmitted data segments
Acknowledging received data Retransmitting any unacknowledged data |
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Where is the control process in a TCP segment?
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In the header
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What protocol is known for its "best effort" delivery method with less overhead than TCP
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UDP
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What 2 reliability mechanisms in UDP are missing that are included in TCP?
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No acknowledgement data is recieved
No retransmitting of unreceived data |
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What protocol is described by the following properties?:
Fast Low overhead No acknowledgements No resend of lost data Delivers data as it arrives |
UDP
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What protocol is described by the following characteristics?:
Reliable Acknowledge data Resends lost data Delivers data in order sent |
TCP
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What application layer protocols use TCP?
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HTTP
Telnet FTP SMTP |
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What application layer protocols use UDP?
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IPTV
VOIP DHCP TFTP SNMP |
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What application layer protocol uses both TCP and UDP?
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DNS
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Establishing a session
Reliable delivery Same order delivery Flow control are all properties of what Layer 4 protocol? |
TCP
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What is a protocol that keeps track of the state of the communication session?
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Statefull protocol
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What layer 4 protocol is known as a stateful protocol?
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TCP
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What layer 4 protocol is considered a stateless protocol?
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UDP
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TCP has _________ bytes of overhead in its header compared with only ________ bytes of overhead in UDP.
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20
8 |
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The sequence number in a TCP header is used for what?
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Data reassembly purposes
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Acknowledgement number in a TCP header is used for what?
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Indicates that data has been recieved
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Header length of the TCP header is used for what?
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Indicate the length of the segment header
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Cotnrol bits field in the TCP header is used for what?
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Indicates the purpose and function of the segment
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Window size field in a TCP header is used for what?
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Number of segments that can be accepted at a time
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The pieces of communication in UDP are called what?
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Datagrams
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What is a unique identifier that is used to keep track of specific conversations and destination services requested?
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Port number
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What port, is assigned a randomly generated number by the sending device to identify a conversation between two devices?
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Source port
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What term describes a combination of the source and destination IP addresses and the source and destination port numbers?
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Socket
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T or F, the socket is used to identify the server and service being requested by the client.
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T
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T or F, it is the combination of the transport layer port number and the network layer IP address of the host that uniquely identifies a particular application process running on an individual host device.
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T
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What are numbers reserved for services and applications known as? and what is the range?
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Well known port numbers
0 - 1023 |
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What are the numbers assigned to user processes or applications that may be used dynamically as a client source port? What is the range?
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Registered port numbers
1024 - 49151 |
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What are known as ephemeral ports that are usually assigned dynamically to client applications when the client initiates a connection to a service? What is the range?
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Private Ports
49152 - 65535 |
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What are the well-known TCP ports for the following?
FTP Telnet SMTP HTTP IMAP IRC HTTPS |
FTP - 21
Telnet - 23 SMTP - 25 HTTP - 80 IMAP - 143 IRC - 194 HTTPS - 443 |
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What are some well-known UDP port numbers of the following?
TFTP RIP |
TFTP - 69
RIP - 520 |
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What command is used to display protocols in use, the local address and port number, foreign address and port number, and connection state?
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netstat
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T or F, an individual server cannot have 2 services assigned to the same port number within the same transport layer service.
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T
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__________ sequence numbers enable reliability by indicating how to reassemble and reorder received segments.
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Segment
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This optional feature allows for the destination to acknowledge bytes in discontinuous segments where the host would only need to retransmit the missing data.
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SACKs
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What TCP header field determines the flow control portion of the amount of data segments that the destination device can accept?
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Window size
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The window size determines the number of bytes sent before an acknowledgment is expected, T or F
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T
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The acknowledgement number is the number of the next expected byte, T or F
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T
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