16 Questions
What is the main difference between a Local Area Network (LAN) and a Wide Area Network (WAN)?
WAN is limited to a single site while LAN can cover a large geographical area
What does the physical topology of a network refer to?
The physical layout of the wires and components which form the network
Which protocol is responsible for translating domain names to IP addresses?
DNS
What does the logical topology of a network describe?
The layout which shows how data flows
Which type of network is commonly found in schools and small businesses?
Local Area Network (LAN)
What is the purpose of a firewall in network security?
To filter incoming and outgoing network traffic based on predetermined security rules
What is a disadvantage of bus topology?
If backbone cable fails, the entire network gets disconnected
Which network topology is most commonly found with wireless technology such as Wi-Fi?
Mesh Topology
What is an advantage of star topology?
Performance is consistent even with heavy network traffic
What makes maintaining the network difficult in mesh topology?
Every node is connected to every other node
Which protocol is used for web page rendering?
HTTP
What is the TCP/IP stack of networking protocols used for during communication?
Routing of packets through networks
What does a protocol define?
Set of rules defining how two computers communicate with each other
What is the Internet structure that allows computers on opposite sides of the globe to communicate with each other?
Network of networks
What happens if the central switch fails in star topology?
The rest of the network fails
What is the main disadvantage of mesh topology if using a wired network?
A large quantity of cable is required compared to other network topologies like bus and star
Study Notes
Network Fundamentals
- The main difference between a Local Area Network (LAN) and a Wide Area Network (WAN) is the geographical area it covers, with LAN connecting devices in a limited geographical area and WAN covering a larger geographical area.
- The physical topology of a network refers to the physical layout of devices and connections.
Protocols and Addressing
- The protocol responsible for translating domain names to IP addresses is DNS (Domain Name System).
- DNS is used to resolve human-readable domain names to IP addresses.
Network Types
- A Local Area Network (LAN) is commonly found in schools and small businesses.
- LAN connects devices in a limited geographical area.
Network Security
- The purpose of a firewall in network security is to block or allow incoming and outgoing network traffic based on predetermined security rules.
Network Topologies
- A disadvantage of bus topology is that if the backbone cable fails, the entire network fails.
- Star topology is commonly found in wireless technology such as Wi-Fi.
- An advantage of star topology is that if one device fails, others remain unaffected.
- In mesh topology, each device is connected to every other device, making it difficult to maintain the network.
- If the central switch fails in star topology, the entire network fails.
- A disadvantage of mesh topology in a wired network is that it requires a large number of cables.
Internet and Communication
- The TCP/IP stack of networking protocols is used for communication between devices on the internet.
- A protocol defines the rules and structure of data exchanged between devices.
- The internet structure that allows computers on opposite sides of the globe to communicate with each other is TCP/IP.
- HTTP (Hypertext Transfer Protocol) is used for web page rendering.
Network Troubleshooting
- In mesh topology, maintaining the network is difficult due to the complexity of multiple connections.
Test your knowledge on networks, protocols, internet structure, network security, network hardware, client-server and peer-to-peer concepts as per the OCR Computer Science A Level 1.3.3 syllabus.
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