9.1 Networking Flashcards
Topology
The structure of a network
Physical Topology
The actual architecture of a network
Physical Star Topology
- Each client has a direct connection to the central hub
- the hub receives packets for all the clients and delivers them to the correct recipient
- A server can be added by directly connecting it to the hub
Advantages of Physical Star Topology
- Packets are sent directly to their recipient
- Other clients cant see the packets being sent
- Easy to add and remove clients
- No collisions as each cable connects only one device
- Failure of one cable doesnt effect the whole network
Disadvantages of Physical Star Topology
- Central Hub Fails = Entire system fails
- Expensive (a lot of cabling)
Physical Bus Topology
- Clients are connected to a single cable called the backbone.
- A terminator is placed at either end of the backbone
- The server can be connected to the backbone like a client
Advantages of Physical Bus Topology
- No central hub reducing chance of network failure
- No central hub means cheaper
- Little cabling is required (inexpensive)
Disadvantages of Physical Bus Toplogy
- Clients can see all the packets being sent on the backbone, including ones not intended for them
- Risk of collisions
- Backbone failure = Entire system fails
Logical Network Topology
Flow of data packets within a network
Logical Bus Network
Delivers packets to all clients
Logical Star Network
Delivers packets only to the recipient
Physical Star, Logical Bus
Running a bus protocol on the physical star network allows the hub to distribute packets to all connected clients, making it act like a bus network
Host
Device which provides services
Usually a server
Examples of services a host provides
File storage, printer sharing, internet access
Client Server Networking
- Use one or more central servers to provide services to clients on the network
- Connected to the network the same way as clients, but are more powerful machines
How Client Server Networking Works
- Clients on the network request services from the server which then responds with the services
Advantages/Disadvantages of Client Server Networking
ADVANTAGES
- Allows for central management
- Improved security
DISADVANTAGES
- Fair degree of expertise to setup and manage
Peer to Peer Networking
Services are provided by the clients themselves and every client has equal status
Advantages and Disadvantages of Peer to Peer Networking
ADVANTAGES
- More cost effective
- Easier to set up and maintain
DISADVANTAGE
- All clients providing services must be running at all times
Wireless Networking
Allow clients to communicate within a network without physically being connected to it.
Structure of a Wireless Network
- A wireless access point that connects to a wired network
- A Wireless network adapter in the devices connected to the network
WIFI
A Wireless Local Area Network that is based on international standards.
WPA/WPA2
- Data is encrypted using WPA or WPA2.
- WPA stands for wifi protected access
- requires a new wireless client to enter a password to connect to the network
SSID
- Disabling SSIID Broadcast improves security
- Stands for Service Set Identifier
- Stops wireless device within the range of the network from seeing the network is available, and requiring clients to know the SSID to connect.
