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Computer Systems Week 8 > Networks Intro 2 > Flashcards

Networks Intro 2 Flashcards

1
Q

What is a protocol?

A

A set of rules for transmitting data between electronic devices

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2
Q

Protocol layers (OSI model)

A

Application
Presentation
Session
Transport
Network
Data link
Physical

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3
Q

What are the pros and cons of protocol layering?

A

Pro - Simplifies and generalises software interfaces accessing communication services

Con - Performance cost, hence, data transfer rate much lower than available network bandwidth

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4
Q

Internet Protocol Layers

A

Application
Transport
Network
Link
Physical

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5
Q

What is a sequence number?

A

When data is broken down into separate packets, the sequence number determines the order the packets are reassembled when they are received

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6
Q

What are ports?

A

Software designed destination points at a host computer

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7
Q

Addresses

A

Transport layer must deliver messages to destinations with transport addresses

The is composed of an IP address and a port number

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Computer Systems Week 8 (7 decks)

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