50 lines
1.1 KiB
Markdown
Executable File
50 lines
1.1 KiB
Markdown
Executable File
# Module Structure
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## T1
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- Networking Fundamentals
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- Coursework 50%
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## T2
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- Focus on Security
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- Exam 50%
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# MAC (Medium Access Control) Protocol
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- Physical to NIC
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- Checks if packet is for current NIC
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- Does packet contain error?
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# LANs
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## Hub
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- Passive Device, sees incoming signals on one port and retransmits same signals on all other outputs.
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- Half-Duplex
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- Broadcast
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- Doesn't need to understand what is transmitting
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## Switch
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- Where possible, retransmit signals to appropriate destination
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- Must understand packet format and extract destination address
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- Good switches can support multiple simultaneous conversations between disjoint pairs
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- Modern switches can support full-duplex communication
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## Repeater
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- Joins 2 identical LANs to form a larger LAN
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- Unintelligent, just retransmits
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- Repeater creates a "collision domain"
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## Bridge
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- Forms a single Logical LAN from 2 Physical LANs
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- Only retransmits packets on bridged LAN if necessary. (Reduces load, increases efficiency, allows parallelism)
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- Will use MAC protocol of dest network to ensure full retransmission.
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## Router / Gateway
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- Interconnects two different LANs to form a WAN
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