Microsoft IT Specialisation
Complete Study Guide
Networking, Cloud Computing, Security & More
By: Meer Mohtashim
,Section 1: Network Types
A network connects devices so they can communicate. Different network types cover different
geographical areas.
1.1 Network Types Overview
Network Full Name Coverage Area Example
Type
PAN Personal Area A few metres around a Bluetooth headphones
Network person
LAN Local Area Network Single building or home Office network, home Wi-Fi
WLAN Wireless LAN Building / campus Wi-Fi in a café
(wireless)
MAN Metropolitan Area City or large campus City-wide broadband
Network
WAN Wide Area Network Countries / entire globe The Internet
1.2 WLAN Advantages & Disadvantages
Advantages Disadvantages
Wireless freedom — no cables needed Limited range — weakens with distance and
obstacles
Easy to connect multiple devices Security risks — data sent over radio waves
can be intercepted
Cost-effective for retrofitting buildings Interference from other devices (microwaves,
other Wi-Fi)
Key Takeaways — Section 1
✔ The Internet is the world's largest WAN.
✔ LANs and WLANs serve buildings/homes; WANs span countries.
✔ WLANs trade convenience for limited range and security risks.
, Section 2: Network Topologies
A network topology describes how devices are physically and/or logically connected.
Topology Description Pros Cons
Bus All devices share a single Simple, cheap to set One failure brings down the
cable backbone up whole network; now
obsolete
Star All devices connect to a Easy to Central device is a single
central switch/hub troubleshoot; point of failure
isolates failures
Ring Devices connected in a Equal access for all One failure can affect the
circle; data travels in one devices whole ring
direction
Mesh Every device connects to Highly fault-tolerant Very expensive — many
every other device cables & interfaces
required
2.1 Star Topology and Switches
A switch creates both a physical AND logical star topology. Every device has a dedicated link to
the central switch, which intelligently forwards traffic only to the correct destination — unlike a
hub which broadcasts to everyone.
💡 Why bus topology is obsolete: As hubs were replaced by switches and routers, star
topology became standard. Switches create a logical star and are far more efficient than the
old single-cable bus layout.
Key Takeaways — Section 2
✔ Mesh topology is the most expensive (n×(n-1)÷2 connections needed).
✔ Switch = physical AND logical star. Hub = physical star but logical bus.
✔ Ring topology data flows in one direction, identifiable by circular arrows in diagrams.
Complete Study Guide
Networking, Cloud Computing, Security & More
By: Meer Mohtashim
,Section 1: Network Types
A network connects devices so they can communicate. Different network types cover different
geographical areas.
1.1 Network Types Overview
Network Full Name Coverage Area Example
Type
PAN Personal Area A few metres around a Bluetooth headphones
Network person
LAN Local Area Network Single building or home Office network, home Wi-Fi
WLAN Wireless LAN Building / campus Wi-Fi in a café
(wireless)
MAN Metropolitan Area City or large campus City-wide broadband
Network
WAN Wide Area Network Countries / entire globe The Internet
1.2 WLAN Advantages & Disadvantages
Advantages Disadvantages
Wireless freedom — no cables needed Limited range — weakens with distance and
obstacles
Easy to connect multiple devices Security risks — data sent over radio waves
can be intercepted
Cost-effective for retrofitting buildings Interference from other devices (microwaves,
other Wi-Fi)
Key Takeaways — Section 1
✔ The Internet is the world's largest WAN.
✔ LANs and WLANs serve buildings/homes; WANs span countries.
✔ WLANs trade convenience for limited range and security risks.
, Section 2: Network Topologies
A network topology describes how devices are physically and/or logically connected.
Topology Description Pros Cons
Bus All devices share a single Simple, cheap to set One failure brings down the
cable backbone up whole network; now
obsolete
Star All devices connect to a Easy to Central device is a single
central switch/hub troubleshoot; point of failure
isolates failures
Ring Devices connected in a Equal access for all One failure can affect the
circle; data travels in one devices whole ring
direction
Mesh Every device connects to Highly fault-tolerant Very expensive — many
every other device cables & interfaces
required
2.1 Star Topology and Switches
A switch creates both a physical AND logical star topology. Every device has a dedicated link to
the central switch, which intelligently forwards traffic only to the correct destination — unlike a
hub which broadcasts to everyone.
💡 Why bus topology is obsolete: As hubs were replaced by switches and routers, star
topology became standard. Switches create a logical star and are far more efficient than the
old single-cable bus layout.
Key Takeaways — Section 2
✔ Mesh topology is the most expensive (n×(n-1)÷2 connections needed).
✔ Switch = physical AND logical star. Hub = physical star but logical bus.
✔ Ring topology data flows in one direction, identifiable by circular arrows in diagrams.
