7. Networks Flashcards
(27 cards)
What does a Router do?
Sends data packets in the best direction, used in WAN
What is a HUB?
Central, multi-plug adaptor for comps in a network
What does a HUB do once packets of data are received?
Broadcasts packets to all devices on the netowork
What is a Switch?
Smart, multi-plug adaptor which only sends packets to the recipient, using MAC address
What does a Switch do?
- Reduces network traffic
- Increases speed
What are network topologies?
An arrangement, in which nodes on a network are connected together.
What is STAR network?
All devices are connected to a central switch
Advantages of STAR
- Faster data transfer
- If one cable fails the other workstations are not affected
Disadvantages of STAR
- Requires additional hardware (central switch)
- If central switch fails, whole network goes down
What is MESH network?
Each device connects to at least one other. No central point
Advantages of MESH
- No single point of failure
- Transmits data from different devices simultaneously
Disadvantages of MESH
- Expensive to install cabling if using wired connection
- Involves duplicate connections
What is a Client?
A comp which requests the services required by any of the clients
What is a server?
A comp which provides services required by any of the clients
Features of Client Server network
Contains a central server
Advantages of Client Server network
- 24/7 access
- Holds data
- Data is backed up centrally (one location)
Disadvantages of Client Server network
- Data can be hacked
- Its required to access data on server
Features of Peer-to-peer network
- No central server
- If one comp turns off, data can’t be retrieved
Advantages of PTP network
- Easy to maintain
- Specialist staff aren’t required
- Cheaper to set up
Disadvantages of PTP network
- Less secure
- User manages their own backups
- Difficult to maintain a well-ordered file store
Network Interface Card (NIC)
Stored on every device on a network
What does MAC do?
Routes frames on a LAN, local identification
MAC address format
D4:1B:7A:3E:5C:92 - 6 sets of hexadecimal numbers
What IP address do?
Routes packets on WAN, global identification
