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