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26 Cards in this Set
- Front
- Back
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What are the reasons for the OSI model?
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Breaks down network for troubleshooting. Create standards for vendors.
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What is the Physical Layer?
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Electrical pulses over media. Cable, NIC, ext. Something physical. Layer 1
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What is the Data Link Layer?
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Provides physical addrssing IE MAC addresses. Used for local networking. Ensures data is error free at this layer. Layer 2
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What is the Network Layer?
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Provides logical addressing IE IP addresses. This layer finds best path to destination. Layer 3
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What is the Transport Layer?
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Most important layer. Describes how data is sent. Can send reliably or unreliably. TCP or UDP. Other half of Transport layer is port numbers. Transport layer describes what is known as well known services.
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What are the reasons for the OSI model?
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Breaks down network for troubleshooting. Create standards for vendors.
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What is the Physical Layer?
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Electrical pulses over media. Cable, NIC, ext. Something physical. Layer 1
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What is the Data Link Layer?
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Provides physical addrssing IE MAC addresses. Used for local networking. Ensures data is error free at this layer. Layer 2
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What is the Network Layer?
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Provides logical addressing IE IP addresses. This layer finds best path to destination. Layer 3
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What is the Transport Layer?
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Most important layer. Describes how data is sent. Can send reliably or unreliably. TCP or UDP. Other half of Transport layer is port numbers. Transport layer describes what is known as well known services. Layer 4
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What is the Session Layer?
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Starts and ends communication sessions. Also keeps sessions separate. Layer 5
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What is the Presentation Layer?
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Generifies the data. Puts in format everyone can understand. HTML, JPEG ext. Encryption services at this layer....IE HTTPS keys. Layer 6
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What is the Application Layer?
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Application it's self. Provides interface that allows applications to communicate across the network.
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What is the difference between TCP/UDP?
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TCP requires syn/ack. UDP does not. UDP is useful for real time data streams. TCP is for files and such that have to be complete.
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What do Port Numbers do?
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Port numbers designate what services you are trying to access.
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In a browser what does the Application layer do?
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Requests webpage.
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In a browser what does the Presentation layer do?
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Generates the date into HTTP.
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In a browser what does the Session layer do?
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Creates and separates the session.
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In a browser what does the Transport layer do?
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Transport layer decides between TCP or UDP. Partners with session layer to create orig port number to keep session separate.
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What is the Original Port Number also known as?
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Dynamic Source Port #.
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How can I monitor the current connections on my machine?
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In CMD, netstat.
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TCP desktop:1051 localhost:27015 ESTABLISHED
What does this mean? |
Protocal, source socket, destination socket, connection is established and live.
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In a browser what happens at Network Layer?
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Source and Destination IP are added to header of packet.
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Does source/destination IP ever change?
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No.
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In a browser what happens at the Data Link layer?
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MAC/Physical Address is used, which is constantly changing hop to hop.
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What is the big picture address and what is the local address?
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IP is big picture, Mac is local.
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