#13 Networking - part 2

1. What is meant by a data packet?

• A. It is a single layer of a complex networking protocol
• B. It is an individual fragment of a larger data file which has additional headers and trailers added to it, depending on the protocol in use
• C. It is the 'P' part of the PSTN
• D. It is a malicious progrm that is found on a network and can cause harm, so it is classified as malware

2. Which of the following is NOT a feature of circuit switching on a network?

• A. There is a dedicated connection between the sender and receiver throughout the communication
• B. Bandwidth goes unused while no data is being transmitted because other senders cannot use the same connection.
• C. Data packets travel between the sender and the recipient via deifferent routes, and get reassembled upon arrival.
• D. Physical circuits are created using switches.

3. Which one of the following is an example of a checksum that gets added to a data packet?

• A. Payload
• B. Sequence Number
• C. CRC
• D. FTP

4. Which of the following does not apply to peer-to-peer networks?

• A. All nodes request services such as printing and file storage from a central high-specification computer
• B. Individual nodes can be harnessed for distributed computing
• C. All nodes have equal status
• D. It is relatively cheap to set up such a network

5. Identify one disadvantage of using a client-server model for a network

• A. Software and data files can be made available from various locations on the network
• B. Client nodes can be of a much lower technical specification than the server
• C. Servers can keep audit trails of activities occuring on client machines
• D. They tend to have high set-up costs

6. Which of the following statements applies to firewalls?

• A. They are a software concept
• B. They are malware
• C. They are only used in circuit-switched networks
• D. They can be configured so that data packets entering or leaving the network can be denied the right to pass through

7. What is meant by a proxy server?

• A. A high-specification computer that sits at the centre of a LAN and provides file storage with high-speed cache memory
• B. A device that can sit between a network and the Internet and conceal the exact addresses of resources within that network, as well as caching resources for faster access
• C. A server that acts as part of the DNS and resolves IP addresses into URLs
• D. A server on the Internet that serves five or six users and stores their browsing history

8. Which of the following is true about viruses?

• A. They are mainly distributed by ISPs
• B. They cannot cross over to other files while in RAM
• C. They can self-replicate
• D. They cannot exist in peer-to-peer networks

9. Explain what is meant by packet filtering

• A. Used to remove viruses from inside data packets
• B. When a proxy server checks whether a file is already in its cache memory and this prevents a request being sent to retrieve it from the Internet
• C. When a checksum is calcualted and appended to the data packet
• D. When a network inspects the packet's address information and the port it is attempting to access to ensure it should be allowed into the network

10. Which of the following explains the use of encryption in networking?

• A. It is used by gateways as a way to perform translation between protocols
• B. It is required as part of packet filtering
• C. It is chiefly a hardware concern as encryption and decryption are performed by hardware
• D. It seeks to increase security and reduce the overall transfer time taken by a data packet