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24 Cards in this Set
- Front
- Back
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Layer 7
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Application
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Layer 6
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Presentation (ASCII, ABCDIC)
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Layer 5
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Session
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Layer 4
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Transport (Segment)
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Layer 3
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Network (Packet) (Router)
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Layer 2
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Data Link (Frame) MAC, switch
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Layer 1
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Physical (bits)
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TCP/IP Layers 1/2
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App Layer:
Apps and processes that use the network Transport: Provides end2end data delivery |
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TCP/IP Layer 3
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Internet: Defines the data gram and handles the routing of data
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TCP/IP Layer 4
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Network access layer: processes routines for accessing physical media
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What is a client?
Key characteristic of a client/server system? |
A client is a program used to access a service. A client sends a request to a server and the server carries out a function.
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Explain Application protocol
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HTTP, governs how a client and a server interact; specifies format of web page request and response.
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Explain Transport protocol
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TCP, determines the flow control and acknowledgment of packets
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Explain Internetwork Protocol
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Identifies the source and destination as packets are sent across the network.
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Which protocols are associated with the application layer?
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HTTP, FTP, DNS, SMTP, Telnet, DHCP
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Explain how TCP sends info through the network.
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TCP breaks up the message into segments. The segments are sent to the ip process. TCP keeps track of the segments and retransmits when needed.
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How does UDP differ from TCP?
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It is much faster and it doesn't retransmit.
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Explain what a port number is.
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A port number is a numeric identifier within each segment that is used to keep track of conversation and destination services requested.
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What port number is associated with SMTP?
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25
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Which two port numbers are associated with FTP?
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20 and 21
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What is SMTP for?
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It is used to send messages to a local email server.
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Port category 1
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Well-Known: 1-1023 Ports associated with common network applications.
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Port category 2
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Registered: 1024-49151 either, source or destination. used w/ specific apps, like IM
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Port category 3
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Private: 49152-65535 often used as source port. used by any application
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