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13 Cards in this Set
- Front
- Back
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A router connects three links (networks). How many of each of the following can the router be involved with? Physical Layer, Data-Link Layer, Network Layer |
Physical Layer - 3 Data-Link Layer - 3 Network Layer - 1 |
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A host communicates with another host using the TCP/IP protocol suite. What is the unit of data sent or received at each of the following layers: application, network, data-link. |
Application - message Network - datagram Data-Link - frame |
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What data units are decapsulated from a user datagram? |
A Message |
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What are the types of addresses (identifiers) used in the application layer? |
Destination computer name, and name of file needed to access. |
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What are the types of address (identifiers) used in the network layer? |
Logical addresses, source and destination |
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What are the types of address (identifiers) used in the data-link layer? |
Two link-layer addresses to define the source and destination connections to the link. |
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Can you explain why we did not mention multiplexing/demultiplexing services for the application layer? |
The application layer is the top layer in the suite; it does not provide services to any layer, which means multiplexing/demultiplexing does not exist for this layer. |
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Assume a system uses five protocol layers. If the application program creates of message of 100 bytes and each layer (including the fifth and first) adds a header of 10 bytes to the data unit, what is the efficiency (the ratio of application layer bytes to the number of bytes transmitted) of the system? |
The system transmits 150 bytes for a 100 byte message. The efficiency is 100/150 or 66.66 % |
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Creating user Datagrams match to which layers of the TCP/IP protocol suite? |
Transport layer
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Responsibility for handling frames between adjacent nodes match which layers of the TCP/IP protocol suite? |
Data-Link Layer
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Transforming bits to electromagnetic signals match which layers of the TCP/IP protocol suite? |
Physical layer |
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Assume that a private internet requires that the messages at the application layer be encrypted and decrypted for security purposes. If we need to add some information about the encryption/decryption process (such as the algorithms used in the process), does it mean that we are adding one layer to the TCP/IP protocol suite? |
Every time any packet at any layer is encapsulated inside another packet at the same layer, we can think of this as a new layer being added under that layer. |
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The presentation of data is becoming more and more important in today's Internet. Some people argue that the TCP/IP protocol suite needs to add a new layer to take care of the presentation of data. If this new layer is added in the future, where should its position be in the suite? |
The new layer is at the same position as the presentation layer in the OSI model if we ignore the session layer |
